Genealogy & Family
Birth year estimator
A likely ancestor birth year from generations back.
- Instant
- Free
- Private (processed locally)
- No sign-up
Estimate a birth year
Enter a known birth year, the number of generations back and the average length of a generation: the tool gives the estimated year and a range.
Example
| Input | Value |
|---|---|
| Known year | 1950 |
| Generations | 4 |
| Per generation | 30 years |
| Estimated | 1830 (1818–1850) |
Research aid, 100% local calculation.
Frequently asked questions
How long is a generation?
In genealogy, 25 to 33 years is common, with 30 years as a usual value.
Why a range?
Because the age gap between parents and children varies; the range covers the likely cases.
Is it an exact date?
No, it is a research aid, to confirm with birth and marriage records.