DocomintCalculatrice d'Âge
Calculez l'âge exact en années, mois et jours à partir d'une date de naissance, plus les jours avant le prochain anniversaire.
What is a Calculatrice d'Âge?
Calculates a calendar-aware age — years, months, and days — rather than just dividing total days by 365.25, which drifts from the real answer because it ignores actual month lengths and leap years. Also shows total days lived and a countdown to the next birthday.
How to use the Calculatrice d'Âge
- Enter your (or someone else's) birth date
- Press Calculate Age
- Exact age, total days lived, and days until the next birthday all appear instantly, computed on your device
Formula
Age = current date − birth date, expressed as calendar years, months, and days
Calculated from real calendar dates rather than a fixed days-per-year approximation, so leap years and variable month lengths are already accounted for correctly.
Example
Someone born June 15, 1995 is 31 years, 1 month, and 24 days old as of August 8, 2026 — having lived 11,376 days total, with 311 days remaining until their next birthday.
Common mistakes
- Dividing total days lived by 365 for a quick mental estimate — that drifts from the true age since it ignores leap years.
- Assuming the "years" figure increments at the start of the birth month rather than on the exact birthday itself.
- Entering a future date expecting a meaningful "age" result rather than a birth date that has already occurred.
Frequently asked questions
Why not just divide total days lived by 365 to get age in years?
Because that drifts from the true answer — years aren't a fixed 365 days (leap years add a day every 4th year) and it doesn't produce a clean months/days breakdown. This calculator works from actual calendar dates instead, which is exact.
How are leap years handled in the age calculation?
Automatically and correctly — because the calculation works from real calendar dates (comparing month/day/year directly) rather than a fixed-days-per-year approximation, February 29ths and variable month lengths are already accounted for without special-casing.
Can I calculate someone's age on a specific future or past date, not just today?
This tool calculates age as of today automatically. For age on a different reference date, use Date Difference Calculator instead, entering the birth date and your chosen reference date.
How is 'months old' counted for a baby under 1 year?
The same calendar-aware method used for the full result — counting complete months elapsed since the birth date, not a days-divided-by-30 approximation, which would drift depending on which months were involved.
Is my numbers uploaded anywhere?
No — Calculatrice d'Âge runs entirely in your browser using JavaScript/WebAssembly. Your numbers is never sent to a server.