Age Calculator
Find your exact age, days until your next birthday, and the weekday you were born.
Age Calculator
Find your exact age, days until your next birthday, and the weekday you were born.
Starts in your browser. Instructions are below.
How to use Age Calculator
- 01Enter your date of birth.
- 02Leave the second date as today, or change it to see your age on any other day.
- 03Read your exact age, the countdown to your next birthday and the weekday you were born.
About Age Calculator
Age is counted in calendar terms rather than fixed-length units, so the calculator walks forward whole years and months before counting the remaining days. That is why an age can be five years and zero months on a birthday.
Leap years are handled properly, so birthdays on February 29 and ages that span leap years come out right. For counting days between any two dates, use the Date Difference Calculator.
Example: fun facts for a June 15, 1995 birthday
Enter your own date above to see your facts. As an example, someone born on June 15, 1995 was 11,158 days old on January 1, 2026.
| Fact | Value on January 1, 2026 |
|---|---|
| Age in weeks | 1,594 |
| Age in hours | 267,792 |
| Age in minutes | 16,067,520 |
| Age on Mercury | 126.8 years |
| Age on Venus | 49.7 years |
| Age on Mars | 16.2 years |
| Age on Jupiter | 2.6 years |
| Age on Saturn | 1.0 years |
| Next: 1 billion seconds old | February 21, 2027 |
| Next: 15,000 days old | July 9, 2036 |
| Next: 20,000 days old | March 18, 2050 |
Planet ages divide your age in Earth years by each planet's orbit: Mercury 0.241 years, Venus 0.615, Mars 1.881, Jupiter 11.862 and Saturn 29.457. Milestone dates count whole days from your birth date, so 10,000 days old falls about 27 years and 5 months after you were born.
How the exact age is counted
The calculator counts whole years first, then whole months, then the leftover days. If the day of the month has not come around yet, it borrows the days from the previous month. Born March 20 and checking on May 10? That is 1 month and 20 days, because April has 30 days. Total days count every calendar day, including leap days.
- Common mistake: subtracting birth year from the current year. That is a year too high if your birthday has not happened yet this year.
- Common mistake: using 365 days per year. Over 40 years that ignores about 10 leap days.
Frequently asked questions
- Does it handle leap years?
- Yes, including the century rule.
- How is age worked out?
- In whole years and months first, then the leftover days, exactly as people say their age.
- When is the next birthday for someone born on February 29?
- In non-leap years the countdown uses March 1.
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