All tools
471 free tools across 31 categories. Everything runs in your browser, no sign-up.
Finance
FinanceLoan payment calculator
Instantly estimate the monthly payment, total cost and interest of your loan.
Percentage calculator
Calculate a percentage, a share or a % change.
VAT calculator
Calculate VAT, net and gross in an instant.
Compound interest calculator
Grow your savings with compound interest.
Tip calculator & bill split
Tip, total and each person’s share at a glance.
Discount calculator
Sale price, money saved and discount percentage.
Unit price calculator
Compare up to 3 products and find the truly cheapest.
Savings goal calculator
How much to save each month to reach your goal.
Hourly ↔ salary converter
Convert between hourly rate, monthly and annual salary.
Margin calculator
Margin, markup and multiplier from cost and price.
Break-even calculator
How many units to sell to cover your costs.
CAGR calculator
The compound annual growth rate between two values.
Inflation calculator
What your money will really be worth in X years.
FIRE calculator
The capital you need, and in how many years.
Freelance rate calculator
The daily rate that actually pays your target income.
Electricity cost calculator
What this appliance costs per day, month and year.
Proration calculator
Compute an amount prorated by days or shares (rent, subscription).
Rule of 72
Estimate how many years it takes for capital to double, from a rate.
50/30/20 budget calculator
Split your income with the 50/30/20 rule: needs, wants, savings.
ROI calculator
Compute return on investment: net gain, ROI % and annualized ROI.
Currency converter
Convert between currencies with up-to-date exchange rates (ECB), amounts stay local.
Payment fee calculator
Compute PayPal, Stripe or custom fees and the net amount received.
Exchange rate history
Chart of a rate’s evolution over 30 days, 90 days or 1 year.
Invoice generator
Create a professional invoice with live preview and PDF export.
Amortization schedule
Monthly payment, total interest and yearly schedule with chart.
Mortgage calculator
Full monthly payment (principal, interest, tax, insurance) and total loan cost.
Credit card payoff
Time, total interest and required payment to clear a card balance.
Salary converter
Convert a salary between annual, monthly, weekly, daily and hourly.
Net worth calculator
See where you stand: total assets minus total liabilities.
Simple interest
Calculate simple interest (I = principal × rate × time) and the total.
Markup calculator
Compute the selling price, profit and margin from cost and markup.
Sales tax calculator
Add or remove sales tax: net price, tax amount and total price.
Debt-to-income ratio
Compute your debt-to-income (DTI) ratio from your monthly debts and income.
Down payment calculator
Work out the down payment by percent or amount, and the balance left to finance.
APY calculator
Convert a nominal rate and compounding frequency into the effective annual yield (APY).
Pay raise calculator
Compute your new salary after a percentage raise, and the amount gained.
Overtime pay calculator
Compute your total pay with regular hours and overtime hours at a multiplier (×1.5 by default).
Commission calculator
Compute your commission from the sales amount and rate, plus the total received.
Rent affordability
Estimate the rent you can afford from your income and the recommended share (30%).
Budget planner
Monthly income, expenses, balance and breakdown at a glance.
Group expense splitter
Who owes whom after shared expenses.
Subscription tracker
The real monthly and yearly cost of your subscriptions.
Text & Writing
Text & WritingWord and character counter
Count words, characters, sentences and reading time in real time.
Case converter
UPPERCASE, lowercase, Title, camelCase, snake_case…
Lorem Ipsum generator
Generate placeholder text for your mockups.
Slug generator
Turn a title into a clean URL.
Remove duplicate lines
Clean a list by removing duplicate lines.
Text comparison (diff)
Spot the differences between two texts.
Word frequency counter
Spot the most repeated words in your text.
Markdown editor
Write Markdown, preview live, export the HTML.
Reading time calculator
How long your text takes to read, silently or aloud.
Find and replace
Bulk-replace in any text, regex included.
Sort lines
Alphabetical, length, random, with deduplication.
Text cleaner
Double spaces, empty lines, tabs: all gone.
Reverse text
Letters, words or lines backwards, in one click.
Remove accents
é → e, ñ → n, ü → u: text without diacritics.
Morse code translator
Text ↔ Morse both ways, with audio playback.
Typing speed test
60 seconds to measure your WPM and accuracy.
Scrabble score
A word’s value, letter by letter, using your language’s scale.
NATO phonetic alphabet
Spell any text with the NATO phonetic alphabet (Alfa, Bravo, Charlie…).
Bionic reading
Bolds the start of each word to guide the eye and read faster.
Fancy text generator
Turn your text into Unicode fonts (bold, italic, script…) for social media.
Text to binary
Convert text to binary and back (UTF-8, 8 bits per byte).
Readability score
Measure a text’s readability (Flesch score) and the required grade level.
Dictionary
Definitions, pronunciation, audio and synonyms of a word.
Rhyme finder
Find rhymes for an English word, grouped by syllables (perfect and near rhymes).
Online notepad
A notepad that saves everything automatically in your browser, offline.
Remove duplicate lines
Clean a list: drop duplicate lines, blanks and stray whitespace.
Extract emails
Find and extract all email addresses from any text, deduplicated.
Remove line breaks
Strip line breaks from text to get one continuous, neatly spaced paragraph.
Text repeater
Repeat any text as many times as you want, with optional separator and numbering.
Extract URLs
Find and extract all web addresses (URLs) from any text, deduplicated.
Strip HTML tags
Remove all HTML tags from text to get clean, readable plain text.
Add line numbers
Add a number in front of each line of text, with adjustable start, step and separator.
Upside down text
Flip your text upside down (ǝlpoɔ) with Unicode characters, to copy and paste anywhere.
Word cloud generator
Turn a text into a word cloud you can download as PNG.
Caesar cipher
Encrypt/decrypt by shift + brute force.
Health & Wellness
Health & WellnessBMI calculator
Calculate your body mass index and see where you stand per the WHO.
Water intake calculator
Estimate your daily water intake.
Calorie calculator
Basal metabolic rate (BMR) and daily need (TDEE).
Sleep calculator
Wake at the end of a 90-minute cycle, not in the middle.
Smoking cost calculator
What smoking costs you, and what quitting earns you.
Ideal weight
Lorentz, Devine, Robinson and BMI range: 4 answers compared.
Body fat percentage
Your fat % with a tape measure: the US Navy method.
BMR calculator
Your calories at rest (Mifflin-St Jeor) and needs by activity level.
Protein intake
Your grams per day by goal, in concrete food equivalents.
Waist-to-hip ratio
Two measurements, a WHO-validated cardio indicator.
Heart rate zones
Your 5 training zones with the Karvonen method.
Running pace
Distance + time → pace, speed and split times.
Blood alcohol estimate
Widmark estimate and theoretical delays, never a green light to drive.
One-rep max calculator
Estimate your one-rep max (1RM) from a weight and a number of reps.
Macro calculator
Split your calories into grams of protein, carbs and fat by diet type.
Waist-to-height ratio
Compute your waist-to-height ratio (WHtR) and see your risk level.
Body surface area (BSA)
Compute your body surface area (BSA) with the Mosteller and Du Bois formulas.
Food product facts
Nutri-Score, NOVA and nutrition of a product from its barcode.
Calorie needs (TDEE)
Calories per day by activity and goal + macro split.
Calories burned
Calories burned by activity, weight and duration (MET values).
Weight loss calculator
Estimate the time and date to reach your target weight at your pace.
A1C calculator
Convert HbA1c (%) to estimated average glucose (mg/dL and mmol/L).
Blood pressure categories
Classify a blood pressure reading (systolic/diastolic) using the AHA categories.
Lean body mass (LBM)
Estimate your lean and fat mass from sex, height and weight.
Interval timer (HIIT)
Work / rest / rounds, with audio beeps.
Habit tracker
Tick your habits and track your streak.
Caffeine calculator: caffeine in your system and last coffee before bed
Your coffees, teas and sodas → caffeine left hour by hour, coffee cut-off time and EFSA safe levels.
Security
SecurityPassword generator
Create strong, random passwords generated locally.
Hash generator (SHA)
SHA-1, SHA-256, SHA-384 and SHA-512, live.
Password strength checker
Assess your password’s entropy and crack time.
Passphrase generator
Memorable passphrases that are actually strong.
PIN generator
Generate secure random PIN codes (crypto), without sequences or repeats.
TOTP generator
Generate 2FA (TOTP) codes from a base32 secret, with a countdown.
File hash
Compute the SHA-256/SHA-1 hash of a file or text, verify integrity.
Encrypt text
Encrypt a message with a password (AES-GCM + PBKDF2), safe to share.
Base32 encode / decode
Encode and decode text to Base32 (RFC 4648, A-Z 2-7 alphabet).
Base58 encode / decode
Encode and decode text to Base58 (Bitcoin alphabet, no 0/O/I/l).
Has my password leaked?
Check if a password leaked, without ever sending it (k-anonymity).
Image & Photo
Image & PhotoImage compressor
Shrink your JPG, PNG and WebP images without uploading them online.
Image resizer
Change an image’s dimensions while keeping the ratio.
Image converter (PNG, JPG, WebP)
Convert images to PNG, JPG or WebP, nothing uploaded.
Image to Base64
Encode an image as a Base64 data URI for CSS or HTML.
Photo editor
Brightness, contrast, filters and rotation, live.
Color palette generator
Extract colors from an image or build harmonies.
Aspect ratio calculator
Compute width, height and ratio, with standard resolutions.
Favicon generator
Text or emoji → PNG favicon in several sizes, with a tab preview.
Placeholder image generator
Generate a placeholder image at the size and colors you want.
Meme generator
Add outlined top/bottom text to an image, export PNG.
Image watermark
Apply a single or tiled text watermark, adjustable opacity and angle.
Image crop
Crop with a lockable ratio, draggable area, PNG export.
EXIF viewer
Read a photo’s EXIF metadata (camera, date, GPS) and strip it.
Colorblindness simulator
See an image as people with color blindness perceive it (protan/deutan/tritan).
Barcode generator
Create EAN-13 or Code 128 barcodes with checksum, PNG export.
Color eyedropper
Pick a color from the screen or an image, with history.
Color picker
Pick a color on a visual field and get its HEX, RGB and HSL code.
Signature pad
Sign with mouse or finger and download your signature as a transparent PNG.
Color shades generator
Generate the tints and shades of a color (light to dark), copyable codes.
SVG to PNG converter
Convert SVG code to a PNG image at the size of your choice, in the browser.
Image to ASCII art
Turn an image into ASCII art (characters), copyable or downloadable.
Art explorer
Search artworks (Art Institute of Chicago).
Resize image
Change an image’s size in pixels or percent, keeping the aspect ratio.
Collage maker
Combine several photos into a collage: grid, gap, rounded corners, background.
Circle crop
Turn a photo into a circle (avatar) with zoom and border, as transparent PNG.
Pixelate image
Censor an area (face, address, data) by pixelating it into a mosaic.
Photo to sketch
Turn a photo into a pencil sketch, with adjustable intensity.
Round image corners
Round the corners of an image with an adjustable radius, as transparent PNG.
Add image border
Frame an image with a border of adjustable width and color, as PNG.
Flip image
Flip an image horizontally or vertically, then download it.
Rotate image
Rotate an image in 90° steps, then download the result as PNG.
Grayscale image
Convert an image to grayscale (black and white), then download it as PNG.
Blur image
Apply an adjustable blur to an image (background, redaction), then download it as PNG.
Invert image colors
Invert the colors of an image (photo negative), then download the result as PNG.
Sepia image
Apply a vintage sepia filter to an image, then download it as PNG.
Passport photo maker
Crop your photo to official sizes + a 4×6 in print sheet.
Phone mockup generator
Drop a screenshot into a smartphone frame → PNG.
OG image generator
The 1200×630 share image shown on social networks.
Tier list maker
Rank your items into S/A/B/C/D tiers → image.
Online screen recorder
Record your screen, a window or a tab with sound and mic, no watermark.
Developer
DeveloperJSON formatter
Indent, minify and validate your JSON.
Color converter
Convert between HEX, RGB and HSL.
UUID generator
Generate random v4 UUIDs in bulk.
Base64 encoder / decoder
Encode and decode text to and from Base64.
URL encoder / decoder
Encode and decode URLs (percent-encoding).
Regex tester
Test your regex and highlight matches.
QR code generator
Create a QR code from any text or URL.
JSON ⇄ CSV converter
Convert between JSON and CSV both ways.
CSS gradient generator
Design a gradient and copy ready-to-use CSS code.
WCAG contrast checker
Test the accessibility of your text/background colors.
JWT decoder
Inspect a JWT token’s header and claims.
Cron expression parser
Translate a crontab into plain words and see the next runs.
HTML entities
Encode and decode HTML entities, named or numeric.
CSS minifier
Compress or beautify your CSS, with the byte savings.
SQL formatter
Format your SQL queries: keywords and indentation.
XML formatter
Indent and validate your XML, errors flagged.
String escaper
One string, escaped for JSON, JS, HTML, URL and Base64 at once.
Subnet calculator
IP + CIDR → network, broadcast, host range and masks.
Chmod calculator
Tick the rwx permissions: octal and symbolic notation live.
URL parser
Break down a URL: protocol, host, path and decoded parameters.
HTTP status codes
Look up an HTTP code: meaning and when to use it.
User-Agent parser
Browser, OS and engine extracted from a User-Agent string.
ULID & NanoID generator
Unique time-sortable identifiers, an alternative to UUID.
JSON to TypeScript
Turn a JSON object into typed TypeScript interfaces.
CSV to Markdown table
Convert CSV into a Markdown table, with alignments.
Meta tags generator
Title, description, Open Graph and Twitter, with a social card preview.
Robots.txt generator
Create a robots.txt file: agents, permissions, sitemap.
Box-shadow generator
Compose multi-layer CSS shadows with a live preview.
Border-radius generator
Round corners and create organic blob shapes.
Hex viewer
Inspect a file in hex and ASCII, type detected from magic bytes.
MIME types
Find the MIME type for an extension, and vice versa.
SVG cleaner
Shrink an SVG: remove comments, metadata and whitespace, see the savings.
JSON diff
Compare two JSON and spot additions, removals and changes.
px to rem converter
Convert CSS units px, rem, em, pt and % with a configurable base.
Unicode character inspector
Break down each character: U+ code point, decimal, UTF-8 bytes, HTML entity.
Cubic-bezier generator
Craft a CSS animation easing curve by dragging the handles, with an animated preview.
Flexbox generator
Tune a Flexbox container live and copy the ready-to-use CSS.
Text-shadow generator
Compose multi-layer text shadows with a live preview and copy-ready CSS.
Glassmorphism generator
Create a frosted-glass effect (background blur) with live preview and copy-ready CSS.
CSS Grid generator
Build a CSS grid (columns, rows, gap) live and copy the CSS.
CSS clamp() generator
Generate a fluid CSS clamp() size (responsive typography) between two screen widths.
What is my IP address
See your public IP address (IPv4/IPv6) and your connection details.
JSON to YAML
Convert JSON into readable YAML with clean indentation. Ideal for config files.
CSV to JSON
Convert CSV into JSON (array of objects), with adjustable headers and delimiter.
CSV editor
Edit a CSV like a spreadsheet: cells, rows, columns, sort, export.
Markdown table generator
An editable grid → a ready-to-paste Markdown table.
SRT subtitle editor
Edit and resync your .srt subtitles.
Rich text editor → HTML
Write visually, get clean HTML code.
CSS pattern generator
Pure-CSS background patterns (stripes, dots, checkerboard).
Font subsetter and inspector: shrink TTF, OTF and WOFF web fonts
Inspect a font, keep only the characters you need, export TTF and WOFF.
Converters
ConvertersUnit converter
Convert lengths, weights and temperatures.
Number base converter
Binary, octal, decimal and hexadecimal.
Data storage converter
Bytes, KB, MB, GB, TB… in an instant.
Roman numerals converter
Convert numbers ⇄ Roman numerals.
Number to words
Spell out any number in words, error-free.
Scientific calculator
Type a full expression: trigonometry, roots, powers.
Shoe size converter
Convert EU, UK, US and cm shoe sizes for men, women and kids.
Clothing size converter
Convert FR/EU, UK, US and IT sizes for tops and trousers.
Height: feet-inches ↔ cm
Convert a height between feet/inches and centimetres.
Fuel consumption converter
Convert L/100 km, MPG (US/UK) and km/L, and estimate a trip’s cost.
Ring size converter
Convert diameter and circumference into FR, US and UK ring sizes.
Fraction & decimal converter
Convert decimal ↔ simplified fraction (GCD) and compute + and ×.
Download time calculator
Estimate a download’s duration from file size and speed (fibre, 4G, ADSL).
Scientific notation converter
Convert between scientific, decimal, engineering notation and significant figures.
Country info
Capital, population, currency, flag and dialing code of a country.
Temperature converter
Convert instantly between Celsius, Fahrenheit and Kelvin.
Speed converter
Convert between km/h, mph, m/s, knots and ft/s, live.
Weight converter
Convert between kilograms, grams, pounds, ounces, stones and tonnes, live.
Length converter
Convert between mm, cm, m, km, inches, feet, yards and miles, live.
Time converter
Convert seconds, minutes, hours, days and weeks instantly.
Area converter
Convert m², km², ft², yd², acres and hectares in an instant.
Volume converter
Convert litres, millilitres, m³, gallons, pints and cups in an instant.
Energy converter
Convert joules, kilojoules, calories, kilocalories, watt-hours and kWh in an instant.
Pressure converter
Convert pascals, kilopascals, bars, psi, atmospheres and mmHg in an instant.
Power converter
Convert watts, kilowatts, horsepower (hp and PS), BTU/h and kcal/h in an instant.
Angle converter
Convert degrees, radians, gradians, turns, arcminutes and arcseconds in an instant.
Frequency converter
Convert hertz, kilohertz, megahertz, gigahertz and revolutions per minute in an instant.
Number base converter
Binary, octal, decimal, hex and base 2-36.
Date & Time
Date & TimeAge calculator
Your exact age in years, months and days.
Unix timestamp converter
Unix timestamp ⇄ human date (local & UTC).
Date difference calculator
Count days, weeks and months between 2 dates.
Date calculator (± days)
Add or subtract days, weeks, months from a date.
Countdown timer
Days, hours, minutes and seconds until your event.
Time zone converter
What time will it be in Tokyo, New York or Sydney?
Week number
The ISO week of any date, with its boundaries.
Working days
Count the working days between two dates, holidays excluded.
Duration calculator
Add up hh:mm:ss durations: sum, average, total.
Stopwatch
Precise stopwatch with laps and keyboard shortcuts.
Timer
Countdown with presets and a sound alarm.
Pomodoro timer
25 min focus, 5 min break: the Pomodoro method.
Moon phase
The moon phase for any date, with illumination and upcoming full moons.
Sunrise & sunset
Sun times and day length, for your city or your coordinates.
Age on other planets
How old would you be on Mars, Jupiter or Neptune?
Year progress
What percentage of the year has passed? And how many days remain?
Work hours calculator
Compute hours worked (start, end, break) and your daily/weekly pay.
Public holidays
Official public holidays of a country for any year.
On this day
Historical events, births and deaths for a date.
Meeting planner
Find the best time across multiple time zones (24-hour grid).
Calendar event (.ics)
Create an event, download the .ics or add it to Google Calendar.
Unix timestamp converter
Convert a Unix timestamp to a readable date (UTC and local) and back.
Leap year calculator
Check whether a year is a leap year and find the next leap years.
Day of the week
Find which day of the week any date falls on, past or future.
Days until a date
Count the days left until a date (or elapsed since), with weeks and months.
Add or subtract time
Add or subtract hours and minutes from a start time to find the resulting time.
Printable calendar
A month’s calendar, ready to print in one click.
Audio & Voice
Audio & VoiceVoice recorder
Record your voice, visualize the sound, download.
Online metronome
Accurate metronome (Web Audio): BPM, time signature, accent, tap tempo.
Chromatic tuner
Tune by mic: note + cents, adjustable 440 Hz reference.
Tone generator
Emit a pure tone: sine/square/triangle, 20 Hz to 20 kHz.
White, pink & brown noise
Generate white, pink or brown noise with a stop timer.
BPM counter
Tap to the beat: average tempo and stability computed live.
Text to speech
Have your text read aloud by a system voice, adjustable rate and pitch.
Speech to text
Dictate and get the live transcription, then copy the text.
Music scale generator
The notes of a scale + playback (guitar, piano).
Microphone test
Does your mic work? dBFS level, clipping, spectrum and a playback test.
LUFS loudness meter and normalizer (EBU R128 / BS.1770) for streaming and podcasts
Integrated loudness, LRA and true peak per BS.1770, then a normalized WAV, no upload.
Web & Data
Web & DataWeather
Current weather and 7-day forecast for any city.
Air quality
European index and pollutants (PM2.5, NO₂…) for a city.
Wikipedia summary
Extract, thumbnail and link of a Wikipedia article.
Book finder
Find a book by title, author or ISBN (Open Library).
Geocoding
Place name → GPS coordinates, elevation, time zone.
Pokédex
A Pokémon’s sprite, types and base stats (PokéAPI).
Recipe finder
A recipe’s photo, ingredients and steps (TheMealDB).
Crypto prices
Top 10 cryptos, 24h change and 7-day mini chart (CoinGecko).
DNS lookup
A domain’s DNS records (A, MX, TXT, NS, CNAME).
Random user generator
Generate complete fake identities (name, photo, email, address) for your tests.
Cocktail finder
Illustrated cocktail recipe: photo, ingredients, glass and instructions.
Quote generator
Show a random inspirational quote with its author, copyable in one click.
Random dog
Show a random dog photo (with its breed) and refresh endlessly.
Online chart maker
Bar, line, pie and more: paste your data, export a crisp PNG or SVG.
Wi-Fi QR code generator
Share your Wi-Fi with a QR code and a printable card. 100% private.
PDF & Documents
PDF & DocumentsMerge PDF
Combine several PDFs into one, right in your browser.
Split PDF
Extract pages or ranges (1-3, 5) into a new PDF.
JPG to PDF
Turn your images (JPG, PNG, WebP) into a clean PDF.
Rotate PDF
Rotate all pages by 90, 180 or 270°.
PDF page numbers
Add page numbers (position, start, format) to your PDF.
PDF watermark
Add a text watermark to every page (size, opacity, angle).
Delete PDF pages
Remove specific pages (2, 5-6) and keep the rest of the document.
Crop PDF
Crop the margins of every page (top, right, bottom, left) by percentage.
Sign PDF
Place a signature, logo or stamp (image) on a page of your PDF.
Games & Chance
Games & ChanceRandom name picker
One list, N winners: a fair draw without replacement.
Team generator
Split a list into balanced teams, at random.
Dice roller
Roll dice from d4 to d100, several at once, with total and history.
Coin flip
Flip a coin, with a counter and streaks, crypto random.
Random number generator
Draw random numbers between min and max, no duplicates, via crypto.
Lottery number generator
Generate EuroMillions, Loto or custom lottery grids, with crypto random.
Flag quiz
Guess the country from its flag (score + streak).
Spin the wheel
Pick a winner at random with an animated spinning wheel.
Trivia quiz
Test your knowledge: multiple-choice questions, score and streak.
Tournament bracket generator
A list of players → a single-elimination bracket to print.
Secret Santa generator
Assigns everyone a gift recipient, never themselves.
Sudoku solver and generator
Solve any grid, get explained hints, generate puzzles in 4 levels and print.
Home & DIY
Home & DIYTile calculator
Surface + tile size → number of tiles, boxes and cutting margin.
Paint calculator
Area + coats + coverage → liters of paint needed.
Concrete calculator
Length × width × thickness → concrete volume and bags.
Wallpaper calculator
Perimeter + height → number of wallpaper rolls.
Flooring calculator
Area + waste + pack → number of packs to buy.
BTU calculator (AC/heating)
Area + height → AC/heating power in BTU and kW.
Stair calculator (risers, treads, stringer and headroom)
Total rise → number of steps, riser height, tread run, stringer length, opening and code check.
Dew point calculator (humidity, condensation and mold risk)
Temperature + humidity → dew point, absolute humidity and condensation risk on a window or wall.
Electronics
ElectronicsOhm’s law calculator
Enter any 2 of U, I, R → voltage, current, resistance and power.
Resistor color code
4 color bands → resistance value in ohms and tolerance.
LED resistor calculator
Voltage, Vf and current → series resistor and power for your LED.
Voltage divider calculator
Vin, R1 and R2 → output voltage Vout and divider current.
Battery life calculator
Capacity (mAh) and current draw (mA) → estimated runtime in hours.
Capacitor code calculator
Decode a 3-digit code into pF, nF and µF.
Wire gauge (AWG)
Diameter, cross-section and max current of a wire by AWG.
Series & parallel resistors
Equivalent resistance of several resistors in series or parallel.
Marketing & SEO
Marketing & SEOCTR calculator
Clicks and impressions → click-through rate (CTR) as a percentage.
CPM calculator
Cost and impressions → CPM (cost per thousand views).
ROAS calculator
Revenue and ad spend → return on ad spend (ROAS).
Conversion rate calculator
Conversions and visitors → conversion rate as a percentage.
UTM link builder
Build a URL with UTM parameters to track your campaigns.
CPC calculator
Cost per click and estimated clicks for an ad budget.
CAC & LTV calculator
Acquisition cost, lifetime value and LTV:CAC ratio.
Average order value (AOV)
Average order value and orders needed to hit a revenue goal.
Email signature generator
A professional HTML email signature to copy-paste.
Cooking & Recipes
Cooking & RecipesCooking measurement converter
Convert cups, oz, tbsp ↔ grams and ml depending on the ingredient.
Recipe scaler
Original and desired servings → factor and scaled quantities.
Oven temperature converter
Convert °C, °F and gas mark for your recipes.
Baker’s percentage calculator
Flour = 100% → water, salt and yeast in grams from the %.
Portion calculator
Quantity per person × guests → total quantity to plan.
Air fryer converter
Adapt an oven recipe’s temperature and time to the air fryer.
Meat cooking temperatures
Core temperatures by meat and doneness (°C/°F), safety included.
Yeast converter
Fresh ↔ active dry ↔ instant yeast, in grams.
Meal planner
Plan the week of meals + the shopping list.
Education & Study
Education & StudyGPA calculator
Each course’s grade and credits → weighted GPA.
Grade calculator
Points earned and possible → percentage and letter grade.
Final grade calculator
Current grade, target and weight → grade needed on the final.
Exam score calculator
Correct answers and threshold → percentage and pass/fail.
Citation generator
Author, title, year… → citation in APA, MLA or Chicago format.
Weighted grade average
Compute your average from grades and their weights.
Attendance calculator
Your attendance rate and how many classes you can still miss.
Words to pages
Estimate the number of pages from words, font size and line spacing.
Certificate maker
An elegant certificate or diploma to print (PNG).
Flashcards
Build a front/back deck and study by flipping.
Standard deviation calculator
Standard deviation, variance, mean, median and quartiles of a data list.
Quadratic equation solver
Discriminant, real or complex roots, exact form, vertex and graph.
GCD and LCM calculator
GCD and LCM of 2 to 20 numbers, with Euclid steps and prime factors.
Prime factorization calculator
Prime factors, primality test, all divisors and the division ladder.
Pythagorean theorem calculator
Missing hypotenuse or leg, exact radical form, angles, area and diagram.
Word search puzzle maker (printable)
Printable word search with answer key, secret message and on-screen play.
Social Media
Social MediaSocial media character counter
Count characters and check the limits of X, Instagram, TikTok…
Hashtag generator
Turn your keywords into ready-to-paste hashtags.
Engagement rate calculator
Likes, comments and followers → engagement rate as a percentage.
YouTube earnings estimator
Monthly views and RPM → estimated monthly and yearly revenue.
Username generator
A base name → username ideas to try for availability.
Social media image sizes
Recommended dimensions (profile, post, story…) per network.
Follower growth rate
Percent change, net gain and average per-period rate of your followers.
Influencer rate calculator
Estimate a sponsored post price from followers and engagement.
Instagram grid maker and carousel splitter
Puzzle grid or seamless carousel, numbered in posting order.
Instagram line break generator and caption formatter
Blank lines and paragraphs that survive posting, with live counters.
WhatsApp link generator (wa.me)
Your wa.me link with a pre-filled message and a QR code. 100% private.
YouTube thumbnail downloader
Every size of a video’s thumbnail, up to HD, Shorts included. Free.
Thread maker: split long text into posts for X, Threads, Bluesky and Mastodon
Split long text into numbered posts with exact counts. 100% private.
TikTok, Reels and Shorts safe zone checker
See what the app interface hides on your 9:16 video, plus a PNG template.
Cars & Vehicles
Cars & VehiclesTire size calculator
Width / aspect / rim → diameter, circumference and revs per km.
Gear ratio calculator
Drive and driven gear teeth → gear ratio.
Fuel trip cost calculator
Distance, consumption and price → fuel and trip cost.
EV charging time calculator
Capacity, power and levels → estimated charging time.
Engine displacement calculator
Bore, stroke and cylinders → displacement in cc and liters.
Braking distance calculator
Reaction + braking distance from speed and road condition.
Fuel economy converter
L/100 km ↔ mpg (US/UK) ↔ km/L, exact conversions.
Tire pressure converter
Convert bar ↔ psi ↔ kPa for your tires.
Pets & Animals
Pets & AnimalsDog age calculator
Convert your dog’s age with the modern logarithmic formula and by size.
Cat age calculator
Convert your cat’s age using the reference veterinary scale.
Aquarium volume calculator
Length × width × water height → volume in liters and gallons.
Pet food portion calculator
Weight and ration → food amount per day and per meal.
Pet name generator
Name ideas for your dog, cat or other companion.
Puppy adult weight calculator
Estimate a puppy’s adult weight from its weight and age.
Dog pregnancy calculator
Estimated whelping date from the mating date (~63 days).
Pet calorie calculator
Daily calories for a dog or cat from weight and activity.
Science
ScienceMolar mass calculator
Chemical formula (H2O, C6H12O6…) → molar mass in g/mol.
pH calculator
Concentration [H⁺] → pH, pOH and [OH⁻] of a solution.
Density calculator
Mass and volume → density in g/cm³ and kg/m³.
Kinetic energy calculator
Mass and velocity → kinetic energy (½ m v²) in joules.
Half-life calculator
Initial amount, half-life and time → remaining amount.
Molarity calculator
Molar concentration (mol/L) from mass, molar mass and volume.
Ideal gas law calculator
Solve PV = nRT for pressure, volume, amount or temperature.
Wavelength ↔ frequency
Convert λ ↔ f of EM waves and get the photon energy.
Crafts & Sewing
Crafts & SewingKnitting gauge calculator
Gauge → stitches to cast on and rows for a target size.
Yarn yardage calculator
Yarn needed and ball size → meters and number of balls.
Fabric calculator
Pieces and fabric width → length of fabric to buy.
Crochet hook conversion
Crochet hook size equivalents mm ↔ US ↔ UK.
Bead counter
Length and bead diameter → number of beads needed.
Knitting needle conversion
Metric (mm), US and UK needle sizes at a glance.
Cross-stitch calculator
Design size and fabric needed from the fabric count.
Candle wax calculator
Amount of wax and fragrance from the container volume.
3D printing
3D printingFilament cost calculator
Part weight and spool price → filament cost.
Filament length ↔ weight
Convert filament length and weight by diameter and material.
3D print cost calculator
Filament + electricity (time × power) → total print cost.
Infill weight calculator
Model volume and infill → estimated filament weight.
Resin cost calculator
Resin used and bottle price → cost of a resin print.
3D print temperature guide
Recommended nozzle and bed temperatures per material.
Filament spool remaining
Remaining filament length from the spool weight.
Model scale calculator
Scale factor to reach a target size + new dimensions.
STL analyzer and 3D viewer: volume, weight, cost and mesh check
Volume, watertight check, filament weight and cost of STL, OBJ and 3MF files, no upload.
Faith & Calendars
Faith & CalendarsPrayer times calculator
The 5 daily prayer times for your location.
Hijri date converter
Convert Gregorian dates ↔ Islamic (Hijri) calendar.
Hebrew date converter
Convert a Gregorian date to the Hebrew calendar date.
Easter date calculator
Easter date (Western and Orthodox) for any year.
Fasting hours calculator
Fasting duration (Ramadan) between dawn and sunset.
Tithe calculator
Tithe amount (10% or other) on your income.
Zakat calculator
2.5% of your wealth above the nisab.
Bible reading plan
Chapters per day to finish the Bible in your timeframe.
Baby & Parenting
Baby & ParentingDue date
Estimated due date, trimesters and current week, from your last period.
Ovulation calculator
Estimated ovulation and 6-day fertile window, based on your cycle.
Baby name generator
Name ideas: boy, girl or unisex.
Baby feeding calculator
Baby weight → milk amount per day and per bottle.
Pregnancy week calculator
Last period → pregnancy week, trimester and due date.
Contraction timer
Time the duration and frequency of contractions.
Diaper cost calculator
Diapers per day and price → daily, monthly, yearly and total cost.
Genealogy & Family
Genealogy & FamilyAncestor count calculator
How many ancestors you have at the Nth generation (2ⁿ).
Cousin relationship calculator
Cousin degree and how many times removed.
Shared DNA calculator
Percentage of DNA shared by relationship.
Generation gap calculator
Generations × years/generation → era reached.
Descendant count calculator
Children per couple over N generations → estimated descendants.
Birth year estimator
A likely ancestor birth year from generations back.
Ahnentafel number
Father, mother and generation of an Ahnentafel number.
Soundex converter
Phonetic code of a surname for archive searches.
Astrology & Numerology
Astrology & NumerologyZodiac sign
Your Western and Chinese sign, with element, from your date.
Chinese zodiac
Find your Chinese zodiac sign (animal and element) from your birth year.
Life path number
Your numerology life path number from your birth date.
Name numerology
The expression number of a name (Pythagorean method).
Biorhythm calculator
Physical, emotional and intellectual cycles on a given date.
Birthstone finder
The birthstone associated with your month.
Zodiac compatibility
The compatibility between two zodiac signs.
Outdoor & Survival
Outdoor & SurvivalCompass bearing calculator
Bearing, azimuth and direction between two GPS points.
Wind chill calculator
Feels-like temperature from temperature and wind.
Water purification calculator
Bleach and tablet dose to make water drinkable.
Firewood calculator
Firewood needed for a fire based on its duration.
Hiking time calculator
Hike duration (Naismith’s rule) from distance and ascent.
Heat index calculator
Summer feels-like temperature from heat and humidity.
Map scale calculator
Real distance from a measured distance and the scale.
Boiling point by altitude
Water boiling temperature by altitude (mountain cooking).
Shipping & Parcels
Shipping & ParcelsVolumetric weight calculator
Volumetric and chargeable weight of a parcel from its dimensions.
Shipping cost calculator
Estimate a shipment cost: base fee, per-kg rate and fuel surcharge.
Pallet calculator
How many boxes fit on a pallet (layers × footprint).
Parcel size checker
Longest side, girth and length+girth vs carrier limits.
Freight class calculator
NMFC class of an LTL shipment from its density (lb/ft³).
Container loading calculator
How many boxes fit in a 20 ft or 40 ft container.
Delivery date calculator
Delivery date from the ship date and the transit time (business days).
Customs duty calculator
Estimate duty, VAT and total landed cost of an import.
Beauty & Cosmetics
Beauty & CosmeticsHair dye ratio calculator
How much developer to mix based on your hair color ratio.
Fragrance dilution calculator
Concentrate and alcohol for a given concentration (EDT, EDP, extrait).
Skincare order
In which order to apply cleanser, serum, moisturizer and sunscreen.
Skin undertone finder
Cool, warm or neutral, to pick the right foundation.
SPF protection time
Theoretical protection time of an SPF and reapplication reminder.
Bra size calculator
Your size (band + cup) from two measurements.
Hair growth calculator
Time to reach your target hair length.
Makeup expiry guide
Shelf life of each cosmetic after opening (PAO).
Jobs & Career
Jobs & CareerResume builder
Build a professional resume and export it to PDF.
Cover letter generator
Write a polished cover letter and export it to PDF.
Business card maker
Design a business card and download it as an image.
Job offer comparator
Compare the net value of several job offers.
Resume keyword matcher (ATS)
Match your resume to the job and spot missing keywords.