age calculator

Exact age in years, months & days — birthday countdown — no sign-up, no uploads.

Date of birth

Calculate age as of

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How to use the Age Calculator

Enter your date of birth and press calculate age. Your exact age in years, months and days appears — along with total weeks, days lived, and a birthday countdown.

Calculate age at any date

Choose A specific date from the dropdown to calculate how old someone was — or will be — on any date in history or the future.

FAQ

Is my data stored?

No — everything runs in browser. No file upload or saved.

Are leap years accounted for?

Yes. The calculator handles leap years correctly in all totals including exact day counts.

What does the birthday countdown show?

The number of days until your next birthday, the date, and which birthday number it will be.

Can I calculate a future age?

Yes — set the "Calculate age as of" dropdown to a specific future date.