Age Calculator

Calculate exact age in years, months and days from a date of birth, plus total months, weeks and days lived and a countdown to the next birthday.

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How to use it

Enter the date of birth.
Leave “Age on” as today, or pick another date to find someone's age at a past or future point.
Read the exact age and the totals below it.

Examples

Born May 14, 1990

On September 29, 2026 that person is 36 years, 4 months and 15 days old — 13,287 days in total.

Leap-day birthday

Someone born on February 29, 2000 turns 26 on March 1, 2026, since 2026 has no February 29.

How exact age is calculated

Age is counted in whole calendar years first, then whole months, then remaining days — the same way you'd count on a calendar. If the day of the month hasn't been reached yet, the last month isn't complete.

Total days lived is the exact number of days between the two dates, including every leap day.

Frequently asked questions

How is age calculated for people born on February 29?

In common years, this calculator treats March 1 as the birthday, which is the legal convention in many places. Some people celebrate on February 28 instead.

Why does my age in months differ from years × 12?

Total months adds the extra whole months since your last birthday. At 36 years and 4 months, you have lived 436 full months.

Is my birth date stored?

No. The calculation runs in your browser and nothing is sent to a server.

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More in Date & Time · Last reviewed September 2026