How to calculate age from date of birth
- Choose the date of birth.
- Leave the second date as today, or pick another date.
- Read the age, the total days and the next birthday.
About this tool
Enter a date of birth to see the exact age in years, months and days, plus the total in months, weeks, days and hours. Change the second date to find the age on any day, past or future. The next birthday and the days left are shown too. Dates are counted by calendar, so time zones cannot change the answer.
Common questions
How is age counted for a 29 February birthday?
In years without a 29 February, the birthday falls on 28 February or 1 March. This page lets you choose which one to use.
Can I find the age on a past or future date?
Yes. Change the 'Age on this date' box, for example to a form's closing date.
How are months counted?
Whole months are counted from the birth date, and the days left over are shown. If the day does not exist in a month, the month end is used.
Is it free to use?
Yes. There's no sign-up, and you can use it as often as you like.
Is my text uploaded anywhere?
No. This tool runs inside your browser, so what you enter stays on your device.
Do I need to install anything?
No. It works in your browser on a computer or a phone.