Calculate your exact age in years, months and days, plus totals and your next birthday.
How to use the Age Calculator
Enter your date of birth.
Optionally change the "age at date" to calculate your age on any day.
See your exact age plus totals and your next birthday.
An age calculator that works out your exact age in years, months and days from a date of birth to any reference date: the precise 36 years, 2 months and 25 days rather than just a round number of years.
Everything runs in your browser, so the date you enter is never uploaded, and the result updates instantly.
Beyond your age, it reports the totals: how many months, weeks, days and even hours you have lived, which is a fun and sometimes useful way to see a lifespan from a different angle.
It also tells you the day of the week you were born on and counts down the days until your next birthday, so you can see at a glance how far away it is.
By default it calculates your age today, but you can change the reference date to any day, past or future, to find out how old you were at an event or will be on some future date.
All calculations use real calendar dates, so leap years, the differing lengths of months and the leap day on 29 February are handled correctly rather than approximated.
Frequently asked questions
It counts full calendar years, then months, then days between the two dates, the same way you would say someone is "36 years and 25 days old".
Yes. Change the "age at date" field to any date to see the age on that day.
Yes. Calculations use real calendar dates, so leap years and varying month lengths are handled correctly.
The tool shows your total days lived, along with total months, weeks and hours, calculated exactly from your date of birth to the reference date.
It shows the weekday of your date of birth, worked out from the real calendar.
No. The calculation runs entirely in your browser, so the date you enter never leaves your device.
Embed this tool
Add this tool to your own website. Copy the snippet below; it stays up to date automatically.
<iframe src="https://monu.tools/embed/en/age-calculator" width="100%" height="640" style="border:1px solid #e5e5e5;border-radius:12px;max-width:680px" loading="lazy" title="Monu Tools"></iframe>Related tools
Generate random numbers in any range, with or without duplicates, using secure randomness.
Convert a time across the world's major time zones, with daylight saving handled automatically.
Solve proportional and inverse rule-of-three problems: if A corresponds to B, what does C correspond to?
Work out the tip and split the bill between any number of people, with optional rounding up.