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Age Calculator

Your exact age in years, months and days — leap years handled correctly, plus total days and next birthday.

Processed locally – files never leave your device

Your exact age is

—

Born on a —

—Total days lived
—Total months
—Next birthday
—Days until next birthday

Next: try BMI Calculator — BMI Calculator with clear results and explanation.

How old are you, exactly — not just in years, but in years, months and days? This free age calculator works it out from your date of birth to today, or to any date you choose, handling leap years and uneven months correctly. It also shows your total days lived, the day of the week you were born, and when your next birthday falls.

Dates are personal, so everything is calculated in your browser — nothing is uploaded or stored. If you want a health check to go with your age, try the BMI Calculator, or work out a share of something with the Percentage Calculator.

How to use

  1. Enter your date of birth using the date picker.
  2. Check the “age at” date — it defaults to today, or pick any past or future date.
  3. Read your exact age in years, months and days, plus total days lived and your next birthday.
  4. Use Copy result to save or share the answer.

Why use Toolsvine

Most age tools divide total days by 365, which gives the wrong answer around leap years and month ends. Toolsvine counts whole calendar years, months and days properly, shows the borrowing steps, and never uploads your date of birth.

How exact age is worked out

Your age is not your total days divided by 365 — that shortcut drifts, because some years have 366 days and months are uneven. The exact method counts whole calendar years first, then whole months, then the remaining days, borrowing from the previous month when the day has not been reached yet.

The borrowing method, step by step

Take 29 February 2000 to 11 November 2026. Years: 2026 − 2000 = 26. Months: 11 − 2 = 9. Days: 11 − 29 is negative, so borrow October's 31 days: 11 + 31 − 29 = 13 days, and months drop from 9 to 8. Exact age: 26 years, 8 months and 13 days; total days lived: 9,752.

Leap years and 29 February birthdays

A year is a leap year if divisible by 4, except century years, which must also be divisible by 400 — so 2000 and 2024 were leap years, but 1900 and 2100 are not. If you were born on 29 February, this calculator counts your birthday as 28 February in non-leap years, and your age still advances by whole calendar years.

Recent leap years

Leap yearDays in FebruaryDays in year
201229366
201629366
202029366
202429366
202829366

Besides the exact age, the calculator shows total days lived, total months, the day of the week you were born, and your next birthday with how many days away it is. Change the “age at” date to answer questions like “how old was I when I graduated?” or “how old will I be on 1 January 2030?”

Frequently asked questions

How is exact age calculated, including leap years?

Count whole years, then whole months, then borrow days from the previous month when needed. Try 29 February 2000 against 11 November 2026: 26 years, 8 months and 13 days.

Why not just divide total days by 365?

Months have 28 to 31 days and leap years add an extra day, so dividing total days by 365 can be off by several days. Counting whole calendar years, then months, then days matches how birthdays actually fall.

What happens if I was born on 29 February?

In non-leap years this calculator treats 29 February as 28 February for the next-birthday date, and your age still increases by one whole year on that date. Some people celebrate on 1 March instead.

Can I find my age on a past or future date?

Yes — change the “age at” date to any past or future date, such as your graduation day or 1 January 2030.

Is my date of birth uploaded anywhere?

No. Both dates are processed in your browser and never leave your device. Nothing is uploaded, stored or shared, and the tool works offline once the page has loaded.

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