Age Calculator
Enter a date of birth to see the age in years, months and days, how many days that is in total, and how long until the next birthday.
This tool runs entirely in your browser; what you enter is never sent to our servers.
How to use it
- Pick the date of birth.
- The age is worked out for today; change the date to use another day.
- The age, total days and the next birthday appear straight away.
How age is counted
Age is counted on the calendar from the birthday: completed years first, then months, then the remaining days. Someone born on 15 May 1990 is 36 years, 5 months and 28 days old on 12 November 2026. People born on the 31st turn a month older on the last day of shorter months, and people born on 29 February turn a year older on 28 February in non-leap years. Time zones don't affect the result.