Age Calculator
Exact age in years, months and days.
From is after To — showing the difference anyway.
- Total months
- Total weeks
- Total days
Your data never leaves your device — everything runs in your browser.
How to use it
- Pick the date of birth.
- To calculate the age on a day other than today, change the “Age on” date.
- See the age in years, months and days, the totals in months, weeks and days, and the countdown to the next birthday.
Frequently asked questions
How is age calculated?
We count the full years from the birth date to the target date, then the remaining full months, then the remaining days. For example, someone born on March 15, 2000 is 26 years, 7 months and 26 days old on November 10, 2026.
When is the birthday of someone born on February 29?
In years that are not leap years, we treat February 28 as the birthday and count down to that date. Customs differ by country; some people celebrate on March 1 instead.
Can I find the number of days between two dates?
Yes. Switch to “Between two dates” and enter a From and a To date. You get the difference in years, months and days, and as a total number of days. If From is after To, you still get the difference.
How old am I in days, weeks or months?
Enter your date of birth: the result shows your age in years, months and days, plus your age in total months, total weeks and total days.
Is the date I enter stored?
No. The calculation happens in your browser and the date is never sent anywhere.