Planet
Your Age on Mars
Mars is home to Olympus Mons, the tallest volcano in the solar system.
Enter your birth date
See your Marsage, next birthday, and milestones.
Mars
686.98Earth days per year
3.71Surface gravity (m/s²)
2Moons
Frequently Asked Questions
How long is a year on Mars?
One Mars year is 686.98 Earth days — that is how long Mars takes to orbit the Sun.
How is my Mars age calculated?
We divide the days you have been alive by 686.98, the length of a Mars year in Earth days.
When is my next Mars birthday?
Your next Mars birthday happens when you complete another full orbit's worth of Earth days — roughly every 687 days.