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Age Calculator

Calculate your exact age in years, months, and days. Find the time between any two dates with precision, including total days, weeks, and months lived.

Select your birth date to see your exact age

Quick Facts

Most common age search25-34
Average life expectancy (US)77.5 years
Days in a leap year366
Longest verified human age122 years

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How to Use This Calculator

  1. Enter your date of birth (or the start date) using the date picker.
  2. Optionally change the 'Calculate to' date if you want to find the age at a specific date rather than today.
  3. Click Calculate to see your exact age.
  4. Review the detailed breakdown showing years, months, days, total days, total weeks, and next birthday countdown.

The Formula

Age = Target Date - Birth Date, accounting for variable month lengths and leap years. Total days = difference in calendar days. Next birthday = next occurrence of birth month/day after target date.

Frequently Asked Questions

The calculator uses JavaScript's Date object which correctly accounts for leap years. February 29 birthdays are calculated as March 1 in non-leap years for the 'next birthday' countdown, while the age calculation itself is always precise to the day.