Find Out Exactly How Old You Are

Free age calculator that shows your precise chronological age in years, months, weeks, days, hours, minutes and seconds from any date of birth. The tool also highlights the day of the week you were born, counts down to your next birthday, and shows playful facts like your age on other planets.

How to calculate your exact age

Enter your date of birth

Pick your birthday from the date selector — the result appears instantly.

Choose a reference date (optional)

Defaults to today, but you can set any past or future date to see your age at that moment.

Read your age breakdown

Full years, months, and days are shown plus the same age in weeks, hours, minutes and seconds.

Check your next birthday

The card shows how many days remain until your next birthday and the age you'll turn.

Explore fun life facts

Compare your age on other planets and estimate how many heartbeats and breaths you've had.

Calculate your exact chronological age in years, months, days and seconds — down to your next birthday.

Your date of birth

Age on this date

Enter your date of birth above to see your exact age.

Key features

Exact age, live to the second

Years, months, days, hours, minutes and seconds update in real time for today's date.

Next birthday countdown

See how many days remain until your next birthday and which age you'll turn.

Age on any reference date

Pick any past or future date to see how old you were or will be at that moment.

Planetary age & life stats

Fun facts: your age on Mars, Mercury, Jupiter, plus approximate heartbeats and breaths.

Frequently asked questions

How does the age calculator work?

It takes your date of birth and a reference date (today by default) and computes the difference in full years, months and days using standard calendar arithmetic. The same difference is also shown in weeks, hours, minutes and seconds.

Why do my age in days and age in years × 365 differ?

A calendar year averages 365.25 days because of leap years. Multiplying years by 365 ignores the extra quarter-day per year. The calculator walks the calendar month by month to avoid this rounding error.

Can I calculate age at a past or future date?

Yes. The "Age on this date" picker accepts any date, not just today. Use it to see how old you were on a specific event or how old you will be at a future milestone.

Is the live seconds counter accurate?

When the reference date is today, seconds tick forward in real time based on your system clock. It is accurate to the second as long as your device time is correctly set.

Why are the planetary ages just approximations?

Mars, Mercury and Jupiter orbit the Sun at different periods, so your Earth age divided by that period gives a comparable figure. It is a conversion of time units, not a claim about planetary experience.