Age Calculator
Calculate exact age in years, months, and days from a date of birth.
DATE OF BIRTH
Enter a date of birth above to see the exact age.
What this tool does
An age calculator works out the exact time between a date of birth and any reference date, broken into years, months, and days, so you don't have to count calendar days by hand.
How it works
- Enter the date of birth.
- Optionally change the “Calculate age as of” date — it defaults to today.
- The exact age and total number of days update instantly as you edit either date.
Example: Enter a date of birth of January 1, 2000 and leave “as of” at today — the tool returns 26 years, 8 months, and 20 days, along with the running total in days.
Yes. The age calculator is completely free, with no signup, no watermark, and no limit on how many times you use it.
It uses the standard published formula for this calculation, so results match what you'd get doing the math by hand — instantly and without the risk of a manual error.
Yes — it's fully responsive and works the same on mobile, tablet, or desktop, with no app to download.
No. Your inputs are used only to calculate your result in the browser and aren't stored or sent anywhere.
Yes — "age calculator" and "calculate age from date of birth" describe the same task. This page is built to handle that search directly, without redirecting you elsewhere.