Age Calculator

Calculate exact age in years, months, and days from date of birth.

Parameters & Inputs

Date of Birth

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Set your values on the left and click Calculate to view instantaneous results.

Age Calculator returns your exact age in years, months and days from a date of birth, plus the number of days until your next birthday.

It accounts for leap years and unequal month lengths, so the day count is exact rather than an estimate based on 30-day months.

1
Enter the birth date
Pick the date; the calculator uses the local calendar date.
2
Set the reference date
Today by default, or another date to compute age at a specific moment.
3
Read the breakdown
Years, months, days, total days lived, and days to the next birthday.

How are leap years handled?

February 29 is counted correctly; someone born on that date ages on March 1 in non-leap years by convention.

Why does the day count differ from years × 365?

Because of leap days and months of different lengths. The exact count includes every actual day.

Which timezone is used?

Your device's local timezone. Near midnight this can shift the result by one day.

Can I calculate age on a past date?

Yes, set the reference date to any point after the birth date.

Last updated November 2026. Files are processed on FilePlume's own hardware and deleted within 60 minutes; nothing is used for training.