About Age Calculator
This age calculator works out exact age from a date of birth in years, months and days. It also shows the total number of months, weeks and days you have lived, and how many days remain until the next birthday. Month lengths and leap years are taken into account, so a person born on 29 February is handled correctly.
By default the age is measured to today, but you can change the Age at date field to find an age on any other day, such as a school cut-off date, a visa application date or a future milestone. If the birth date is later than the chosen date, the tool tells you instead of showing a wrong result. Nothing is uploaded; it all runs in your browser.
How to use Age Calculator
- 01
Enter a date of birth.
- 02
Optionally change the “age at” date.
- 03
See years, months, days and the next birthday.
When to use it
- Check whether a child meets the age cut-off for school enrolment on a given date.
- Fill in forms that ask for exact age in years and months.
- Count how many days remain until a birthday or anniversary.
- Find the total number of days or weeks someone has been alive.
- Work out what age you will be on a future date, such as a deadline.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth and the tool counts the full years and months since then, then the remaining days. The result looks like 30 years, 4 months, 12 days, measured to today unless you pick another date.
Can I find my age on a past or future date?
Yes. Change the Age at date field to any date on or after the birth date. This is useful for school cut-offs, eligibility checks, or planning what age you will be at a future event.
Does it handle leap years?
Yes. Month lengths and leap days are handled correctly. If someone was born on 29 February, the tool uses the last day of February in years that are not leap years when counting months.
How many days until my next birthday?
The Next birthday in box shows the number of days from the chosen date to your next birthday. If your birthday is on the chosen date itself, it shows 0 days.
Why does it say the birth date is after the chosen date?
The Age at date must not be earlier than the date of birth, since a person cannot have a negative age. Check that both dates are entered correctly and in the right fields.
Is my date of birth saved anywhere?
No. The calculation happens in your browser and nothing is sent to a server. There is no sign-up, so your date of birth stays on your own device.