Age Calculator
Exact age from date of birth.
Age Calculator at a glance
Age Calculator is a free online calculator you can use right now to exact age from date of birth โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Calculators
About Age Calculator
The Age Calculator gives your exact age from a date of birth โ years, months and days โ along with your total days lived and how long until your next birthday. It also works for any two dates, so you can measure the gap between events.
Date arithmetic is fiddlier than it looks, which is why doing it in your head goes wrong. Months have different lengths, leap years add a day every four years (but not in century years unless divisible by 400), and the answer depends on whether you count from the start or end of a month. The calculator handles all of that.
Common uses: confirming eligibility ages for schemes and documents, filling in forms that want an exact age in years and months, calculating a child's age in months for medical or developmental milestones, and settling arguments about who is older by how much.
How to use Age Calculator
- Type your numbers into the fields.
- The result updates the moment you change a value.
- Adjust any input to compare different scenarios.
Frequently asked questions
How are leap years handled?
They're counted properly. A year is a leap year if it's divisible by 4, except century years, which must be divisible by 400 โ so 2000 was a leap year but 1900 wasn't.
When is a 29 February birthday celebrated?
Legally it varies by country โ some treat 1 March as the birthday in common years, others 28 February. This calculator counts the actual elapsed days, which is unambiguous.
Can I calculate the time between two arbitrary dates?
Yes โ set both dates and you'll get the exact span in years, months and days, plus the total in days.