Age Calculator
Find your exact age in years, months and days, plus total days and your next birthday.
Calculate your exact age in seconds
The Age Calculator works out your precise age from your date of birth — in years, months, and days — and also shows your total days, weeks, and months lived, plus a countdown to your next birthday. Enter your birth date (and optionally an "age at" date to calculate your age on any day, past or future) and the results appear instantly. Everything runs in your browser, so your information stays private.
How age is calculated
Calculating age is trickier than subtracting two years, because months have different lengths and leap years add a day. This tool counts complete years first, then complete months, then the remaining days, borrowing correctly from the previous month when needed — exactly how you would say "I am 34 years, 2 months, and 15 days old." That means the result is always accurate, including across leap years and month boundaries.
What the calculator shows
| Result | Meaning |
|---|---|
| Years, months, days | Your exact age broken into calendar units |
| Total days | The total number of days you have lived |
| Total weeks | Your age expressed in whole weeks |
| Total months | Complete months since birth |
| Next birthday | The date and days remaining until it |
How to use it
- Select your date of birth.
- Leave the second date as today, or change it to calculate your age on any other date.
- Read your exact age and the extra statistics instantly.
Common uses
- Filling in forms that ask for an exact age.
- Checking eligibility by a specific cut-off date.
- Working out a child's age in months for milestones.
- Counting down to a birthday or anniversary.
- Calculating someone's age on a historical or future date.
Leap years and accuracy
Because the calculator works with real calendar dates rather than an average year length, it naturally accounts for leap years and varying month lengths. If you were born on February 29, it counts your birthday on the correct day in each year. The "total days" figure is computed from the exact number of days between the two dates, so it is precise to the day.
Private and free
Your date of birth never leaves your device — all calculations happen locally in your browser. The tool is completely free, with no sign-up and no limits.
Frequently asked questions
How does the age calculator work?
It counts complete years, then months, then remaining days between your date of birth and the chosen date, accounting for different month lengths and leap years.
Can I calculate my age on a future or past date?
Yes. Change the second date to any day and the tool shows how old you were or will be on that date.
Does it handle leap years?
Yes. It uses real calendar dates, so leap years and February 29 birthdays are handled correctly.
Is my date of birth kept private?
Yes. All calculations run in your browser. Nothing is uploaded or stored.