Age calculator
Work out your exact age in years, months and days
Runs in your browser. Nothing is uploaded.
How it works
Your age is the time from your date of birth to today, counted in whole years, then whole months, then the days left. Enter your date of birth to see your exact age, your next birthday and the weekday you were born. Nothing you enter leaves your browser or goes in the link.
age = date − date of birth, in whole years, months and days
If you were born on 29 February, we count your birthday on 28 February in other years, and say so here.
Months vary in length, so we count whole calendar months first. That means the days part is never negative.
Worked example. Someone born on 15 Jan 2000 is 26 years, 2 months, 5 days old on 20 Mar 2026. We count whole years first, then whole months, then the days left.
Examples
| Born | On | Age |
|---|---|---|
| 01 Jan 2000 | 01 Jan 2026 | 26 years, 0 months, 0 days |
| 15 Jun 1990 | 01 Mar 2026 | 35 years, 8 months, 14 days |
| 31 Jan 2024 | 01 Mar 2024 | 0 years, 1 month, 1 day |
What this tool doesn’t cover
- This uses calendar dates, not the time of day you were born.
- Some countries count age differently, or set other legal rules for leap-day birthdays.
Questions
When is a leap-day birthday in other years?
We count it on 28 February. Legal rules can differ by country.
Is my date of birth saved?
No. It stays in your browser, and it only goes in a share link if you tick the box.
Can I work out an age on another date?
Yes. Change the Age on date to any date after the date of birth.
How do I calculate my exact age?
Count the full years since your birth date, then the full months, then the days. This tool handles month lengths and leap years for you.
How many days old am I?
Enter your date of birth, and the result shows your age in years, months and days, as well as your total days.
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