Age Calculator
Your exact age in years, months and days from your date of birth.
About this tool
How old exactly — for a form, an eligibility check, or plain curiosity? This calculator gives your precise age in years, months and days from your date of birth, along with the total in months, weeks, days and hours, and a countdown to your next birthday.
It handles leap years correctly and lets you set any reference date, so you can also answer “how old will I be on…”. The calculation runs locally: your date of birth is never transmitted.
Frequently asked questions
How is exact age calculated?
In complete calendar years, months and days between the date of birth and the reference date, taking the varying length of months and leap years into account — not by dividing days by 365.
Can I calculate my age on a future date?
Yes. Change the reference date to any past or future day to find your age at that moment — handy for retirement dates, eligibility cut-offs and contract terms.
What happens for people born on 29 February?
In non-leap years their birthday is counted on 1 March, which is the convention most administrations follow.
How many days have I been alive?
The tool shows the running total in days, weeks, months and hours alongside your age — the day count is usually the one that surprises people.
Is it really free, with no sign-up?
Yes — the tool is free, needs no account and has no usage limit. Processing happens locally in your browser, so your data never leaves your device.