Unit price calculator
Compare up to 3 products and find the truly cheapest.
- Instant
- Free
- Private (processed locally)
- No sign-up
The only price that matters: the unit price
Between the 500 g pack, the 1.2 kg “family size” and the 3-pack, comparing in your head is hopeless. Enter each product’s price and quantity: everything is normalized per kilo or liter, the cheapest is highlighted and the gap shown as a percentage.
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Fill in 2 or 3 products
Price + quantity + unit (g, kg, ml, cl, L or piece).
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Read the unit price
Each row shows its normalized $/kg, $/L or $/piece.
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Follow the verdict
The winner is highlighted in violet, with the % savings versus the runner-up.
Why unit price is your best ally
- It neutralizes packaging sizes: 500 g at $2.50 ($5/kg) beats 1 kg at $5.40.
- It unmasks fake “value” formats and shrinkflation (less product, same price).
- It is legally required on EU shelf labels, but printed so small that this tool stays faster.
- It also works for detergents (price per wash = piece mode) and coffee pods.
Compare comparable products: a concentrate and a diluted product do not yield the same per liter. For detergents, count in “pieces” (number of washes) rather than liters.
Frequently asked questions
How do I compute a price per kilo?
Divide the price by the quantity expressed in kilos: $2.50 for 500 g = 2.50 ÷ 0.5 = $5/kg. The tool handles the unit conversion (g, kg, ml, cl, L, piece) and the division automatically.
Is the large format always the better deal?
No, it is even a classic marketing trap: the “family” size is sometimes more expensive per kilo than the standard one. Only the unit price comparison tells the truth; it is exactly what shelf labels show… in tiny print.
Can I compare solids and liquids?
The tool compares what is comparable: weight products together ($/kg), liquids together ($/L), pieces together. Mixing natures would be meaningless, the verdict only appears when the units belong to the same family.
What about shrinkflation?
That is the quiet reduction of quantity at the same price, the pack drops from 500 to 450 g. Unit price reveals it instantly: recompute after any suspicious packaging change.