How is my exact age calculated?

We compare calendar dates instead of dividing days by 365. Whole years and months are counted first, then the remaining days, borrowing from the previous month when needed. Leap years are handled automatically — someone born on 29 February 2000 turns 24 on 29 February 2024, not a day earlier or later.

What happens if I was born on 29 February?

In leap years your birthday falls on 29 February as usual. In non-leap years we count your birthday as 28 February, the last day of February, and the countdown and “turning” age are based on that date.

Can I calculate my age as of a past or future date?

Yes. The “as of” date can be any date after your birth date — for example, to find out how old you were when you graduated, or how old you will be on a future date.

Which date format should I use?

The date picker accepts your browser's local format, but behind the scenes dates are stored as year-month-day (for example 2000-02-29), which is unambiguous everywhere.

Is my birth date sent anywhere?

No. The calculation runs entirely in your browser with JavaScript. ToolSahara never asks you to sign up, and your dates are never uploaded, stored or shared.

Age Calculator

Enter your date of birth and a target date (today by default) to see your exact age, your total time alive in days, weeks and months, which day of the week you were born on, and how long until your next birthday. Everything is computed right in your browser — no data ever leaves your device.

Processed in your browser — nothing uploaded

Enter your dates and press “Calculate age” to see your result.

How it works

1
Enter your birth date
Pick the date you were born using the date field. You can type it directly or choose it from the calendar picker.
2
Choose the “as of” date
Leave it on today to see your current age, or pick any past or future date to see how old you were (or will be) on that day.
3
Read your results
Your age is shown in years, months and days, alongside lifetime totals, your birth weekday, and a countdown to your next birthday.

Frequently asked questions

How is my exact age calculated?: We compare calendar dates instead of dividing days by 365. Whole years and months are counted first, then the remaining days, borrowing from the previous month when needed. Leap years are handled automatically — someone born on 29 February 2000 turns 24 on 29 February 2024, not a day earlier or later.
What happens if I was born on 29 February?: In leap years your birthday falls on 29 February as usual. In non-leap years we count your birthday as 28 February, the last day of February, and the countdown and “turning” age are based on that date.
Can I calculate my age as of a past or future date?: Yes. The “as of” date can be any date after your birth date — for example, to find out how old you were when you graduated, or how old you will be on a future date.
Which date format should I use?: The date picker accepts your browser's local format, but behind the scenes dates are stored as year-month-day (for example 2000-02-29), which is unambiguous everywhere.
Is my birth date sent anywhere?: No. The calculation runs entirely in your browser with JavaScript. ToolSahara never asks you to sign up, and your dates are never uploaded, stored or shared.

Age Calculator

How it works

Enter your birth date

Choose the “as of” date

Read your results

Frequently asked questions

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