How does this age calculator work?

Enter a birth date and optional target date. The calculator compares calendar years, months and days, then adds total days lived and the next birthday countdown.

Can it calculate age on a specific date?

Yes. Use the target date field to calculate exact age at any past or future date after the birth date.

Does it support leap day birthdays?

Yes. Leap day dates can be entered and calculated like any other date. The browser date input handles the valid date selection.

Is my birth date stored?

No. The calculation runs locally in your browser and does not require an account, server storage or tracking.

Exact age · next birthday · life milestones

Turn a birth date into a personal timeline.

Calculate your exact age in years, months and days, then see how many days you have lived and when your next birthday arrives.

Private browser calculation · no signup · no stored birth date

Age calculator

Birth date Age at date

Choose today for current age, or select a target date for a deadline, birthday, eligibility check or future event. Selected values are confirmed in written format in the result.

Your result will appear here

Exact ageyears · months · days

Days livedtotal timeline count

Next birthdaycountdown and weekday

Enter your birth date to reveal the timeline hidden inside it.

Practical age questions

Exact age is useful when the calendar details matter.

For birthdays

Check your exact age today, the weekday of your next birthday, and the countdown until it arrives.

For documents

Calculate age on a custom target date when a form, application or eligibility rule asks for age at a specific moment.

For milestones

See total days lived and milestone dates like your 10,000th or 20,000th day without uploading personal data.

Need details? Read how calendar age is calculated, review deadline, child-age and milestone examples, or check the privacy and precision FAQ.

Why this is different

Not just a number. A readable life record.

Exact calendar age

Years, months and days are calculated as calendar units, not rough averages.

Birthday countdown

See how many days remain before the next birthday and what weekday it lands on.

Milestone dates

Reveal your 1,000th, 5,000th, 10,000th and 20,000th day milestones.

Privacy-first

Your date is calculated locally in the browser. No signup, no server storage.