Age on other planets
Find out how old you'd be on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto and when your next birthday on each planet will be.
How to useHow old would you be on Mars?
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Age on other planets: what it is for
Enter your date of birth and the tool divides the days you've lived by the length of each planet's year. The table shows your age on each world and the date of your next planetary birthday.
How to use
- Type your date of birth.
- See your age on each planet.
- Check your next birthday on each one.
When to use it
- Astronomy and science classes.
- A fun fact to share.
- An activity with kids.
Frequently asked questions
How is age on another planet calculated?
The calculator counts how many Earth days you've lived and divides by the length of the planet's year, which is the time it takes to go once around the Sun. A year on Mars lasts about 687 Earth days.
Why am I older on Mercury?
Mercury is the planet closest to the Sun and completes an orbit in just 88 days. So years pass much faster and your age is about four times higher than on Earth.
Is Pluto on the list?
Yes, as a curiosity. Since 2006 Pluto has been classified as a dwarf planet, and a year there lasts almost 248 Earth years.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.