Free · Browser-Based · Birthday Math

Age Calculator

Find exact age, check how old someone was on a specific target date, and see the countdown until the next birthday without leaving the browser.

Birth date

Target date

Reference mode

Timezone note

Age summary

🎯 Common Use Cases

Check exact age for forms

Calculate age on a target date

See next birthday countdown

Estimate time lived in days and weeks

How exact is the result?

The calculator works with calendar year, month, and day differences using your browser's local date rules.

Can I calculate age on a past date?

Yes. Set a target date to check age on any day after the birth date.

Is data sent anywhere?

No. Everything runs locally in the browser.