Date of birth

Name optional, for the age card Date of birth Age on Reset to today

Compare with another person

Your age

You are

0years

0months

0days

Total months

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Total weeks

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Total days

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Total hours

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Total minutes

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Total seconds

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Next birthday

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About your birth date

Life in years each square = 1 year of 90

Milestones

Milestone	Date	When

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What you can do here

More than just a number of years.

Exact to the second

Years, months and days, plus total months, weeks, days, hours, minutes and a live seconds counter.

Birthday countdown

See how many days remain, which weekday it falls on, and how far through the year you are.

Compare two people

Find the exact age gap between you and anyone else in years, months and days.

Age on any date

Change the "Age on" date to see how old someone was or will be on a future date, useful for forms and eligibility.

Shareable age card

Download a ready-made image of your age and next birthday to post or send.

Private

Your date of birth is processed in your browser and never uploaded or stored on our servers.

How age is calculated

We subtract the date of birth from the chosen date year by year, then month by month, borrowing the right number of days from the previous month when needed. This is the same method used on official forms, so 31 January to 1 March counts as 1 month and 1 day in a non-leap year.

If you were born on 29 February, your birthday is shown on 1 March in years that are not leap years.

Frequently asked questions

How do I calculate my age in years, months and days?

Enter your date of birth above. The calculator shows your age on today's date, or on any other date you choose in the "Age on" field.

How many days until my next birthday?

The Next birthday card counts the days from the chosen date to your next birthday and shows the weekday it falls on.

Does it handle leap years?

Yes. Leap days are counted in every total, and a 29 February birthday is treated as 1 March in non-leap years.

Is my date of birth stored?

No. Everything is calculated in your browser. A link you share only contains the dates in the URL you choose to share.

Can I find the age difference between two people?

Yes. Turn on "Compare with another person", enter their date of birth, and the age gap appears below.

Find your exact age, down to the second