Age Calculator

Turn a birthday into your exact age, next birthday countdown and total days lived.

How to use

How is the age calculated?

By counting completed years — the same way official documents do.

Are leap years handled?

Yes. Calculations use real calendar dates.

Can I use a future birth date?

No. The birth date must be on or before the reference date.

Count the days between two dates, or add and subtract days, weeks, months and years and see the resulting weekday.

Time difference between two clock times, adding and subtracting hours and minutes, and worked hours minus breaks — as HH:MM and decimal hours.

Count the days until a target date as D-N, D-DAY or D+N, and keep a list of events saved in your browser.

Solve A : B = C : ?, scale a ratio by N, and convert length, mass and volume units with exact standard factors.