Age calculator
Pick a date of birth and see how old someone is: in whole years, exactly in years, months and days, and in weeks and days. Leave On date empty for today, or pick another day to see how old someone is or was then.
Handy to know someone's age on a particular day, for example for an application.
Fill in the fields; the answer appears here straight away.
How it's worked out
How it works
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Enter the values
Type the numbers or the formula. Decimals may use a point or a comma. No idea? Click Fill in an example.
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Instant answer
The answer appears as you type, with the most important intermediate values.
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See the working
Under "How it's worked out" you see the steps, handy for checking your own calculation.
Handy for
- Knowing exactly how old you are, or how many days you have been alive.
- Checking whether someone is 18, 21 or 65 on a particular date, for example for an application.
- A baby's age in weeks or months.
- The day of the week you were born and when your next birthday is.
How does it count?
First the calculator counts the whole months from the date of birth, then the days that are left. If you were born on the 31st and a month is shorter, the last day of that month counts. Someone born on 29 February turns a year older on 28 February in years without a leap day. To count the days between any two dates, including working days, use days between dates.
Frequently asked questions
Is the age calculator free?
Yes. The age calculator is completely free, with no account, sign-up or usage limit.
How accurate is the result?
The tool calculates with your browser's number precision. For important calculations, always double-check what you entered.
Does it work on my phone?
Yes. The tool works in any modern browser on a phone, tablet or computer.