Age Calculator

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

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How to use this calculator

Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.

How age is calculated

Age is counted in completed years, then completed months, then remaining days. If the day of the month hasn’t been reached yet, we borrow the number of days in the previous month. This is the same method most people use when they say “I’m 25 years and 3 months old”.

Total days is the exact number of calendar days between the two dates (the birth date isn’t counted).

Example

Born January 15, 2000, on October 30, 2026: 26 full years (to January 15, 2026), then 9 full months (to October 15, 2026), then 15 days. Age: 26 years, 9 months, 15 days.

Uses

  • Forms that ask for age on a specific date (school entry, sports age groups, retirement plans).
  • Finding how many days old you are for a milestone (10,000 days is about 27.4 years).
  • For babies, use the Baby Age Calculator (coming soon); for pets, the Dog Age Calculator.

Frequently asked questions

How old am I if I was born in 2000?

You turn 26 in 2026. Enter your full birth date for the exact age.

How many days old am I?

Enter your date of birth; the “Total days” value shows it.

What if I was born on February 29?

In common years we treat February 28 as your birthday. Some jurisdictions use March 1 for legal purposes.

About this tool

Written by
[Author: to be assigned]
Reviewed by
Formula tests passed · human review pending
Last updated
31 Oct 2026

See our methodology and editorial policy. Think something’s off? Report an error with this tool.

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