What is an age calculator?
An age calculator works out your exact age from your date of birth — not just the years, but the months and days too. Counting manually is slow and easy to get wrong because months have different lengths and leap years add extra days. This free tool does the maths instantly and accurately.
How to use this age calculator
Enter your date of birth in the box above and press the button. You will see your exact age, the total number of days and weeks you have lived, and a countdown to your next birthday.
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Frequently asked questions
How old am I in days?
The calculator shows your total days lived right under your age. The average person lives about 27,000–30,000 days.
Why does my age change on my birthday and not on January 1st?
Your age increases on the anniversary of your birth date, which is why an exact date-of-birth calculator is more accurate than counting years alone.
Is my data stored?
No. The calculation happens in your own browser — your date of birth never leaves your device.
Want to count the days until your next birthday? Try the Birthday Calculator. Curious how your pet ages? See the Dog Age Calculator and Cat Age Calculator.