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How many days have you been alive?

See your days lived, estimated heartbeats and age on other planets. Your next 1,000-day milestone is waiting, too.

Month

Day

Year

Choose your birth date above to see your result.

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The math behind the numbers

We start from elapsed time since local midnight on your birth date, then layer on illustrative fixed rates: 72 heartbeats and 16 breaths a minute, a full moon every 29.53 days, and each planet’s real orbital period for your cosmic ages. It all runs in your browser: your birthday is never stored. Heartbeats and breaths are not health measurements; the rates do not account for sleep, activity or age. Lunar cycles are estimated intervals, not a count of full moons you personally saw.

Frequently asked questions

How many days have I been alive?

Enter your date of birth above and the tool estimates elapsed days from local midnight on your birth date, then turns it into heartbeats, breaths, approximate lunar cycles and your age across the solar system.

How is my age on other planets calculated?

A year on each planet is the time it takes to orbit the Sun. We divide the total days you have been alive by each planet’s orbital period, so you can see how old you would be on Mercury, Venus, Mars, Jupiter and Saturn.

What is the milestone date?

We find your next round 1,000-day milestone: like your 10,000th or 15,000th day alive: and tell you the exact calendar date it falls on, so you can actually celebrate it.