About this calculator
Age is counted in whole years, then whole months, then the remaining days. When the day of the month hasn’t come round yet, a month is borrowed and the days of the previous month are added. People born on 29 February celebrate on 28 February in common years here.
Worked example
Someone born on 14 June 1992 is 34 years, 4 months and 21 days old on 4 November 2026 — 12,561 days in all.
How to use the age calculator
- Enter the date of birth.
- Enter the age on.
- Read the result — it updates as you type.
Frequently asked questions
How is age calculated in years, months and days?
Full years are counted first, then full months since the last birthday, then the days left over.
Does it work out the age on a future date?
Yes. Change the “age on” date to any date after the date of birth.