Date & time Ages
Age calculator
Date of birth
On this date
Age —
Live · calendar months, then real days
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Age is counted in whole calendar years, then whole months, then the remaining days. Someone born on 15 May 1990 is 36 years, 3 months and 8 days old on 23 August 2026. The day before a birthday you are still the previous age — the year only completes on the day itself.
How to work out an age
1 Enter the date of birth.
2 Leave the second date as today, or change it to work out an age on any other day.
3 Read the total in days, weeks, hours and minutes underneath, along with the next birthday.
Month arithmetic is where these calculators disagree with each other. From 31 January to 1 March is one month and one day here, because adding a month to 31 January lands on 28 February — the last day that exists — and then one day gets you to 1 March. Any other rule produces an impossible date somewhere along the way.
Questions
A 29 February birthday falls back to 28 February in a common year for the "next birthday" figure, and returns to the 29th when the next leap year comes round.
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