How long is a year on Mars?
Data as of July 2026
687 Earth daysone orbit of the Sun
A year on Mars, one full trip round the Sun, lasts 687 Earth days, or 1.88 Earth years. Counted in Mars's own days (sunrise to sunrise), that is 669 Mars days.
▶ Watch Mars orbit in 3D
What a Mars year means
A Mars year is almost two Earth years, which makes its seasons about twice as long as ours. Rover teams count their missions in sols, and a Mars year is about 669 of them.
One year
687 Earth days
In Earth years
1.88
In Mars days
669
If you are 30 on Earth
you'd be 16 in Mars years
Distance from the Sun
1.52 AU
A day there
24 h 40 min
Year length on every world
| World | One year | In its own days |
|---|---|---|
| Mercury | 88 Earth days | 0.5 |
| Venus | 225 Earth days | 1.9 |
| Earth | 365 Earth days | 365.25 |
| Mars | 687 Earth days | 669 |
| Jupiter | 11.9 Earth years | about 10,500 |
| Saturn | 29 Earth years | about 24,200 |
| Uranus | 84 Earth years | about 42,700 |
| Neptune | 165 Earth years | about 89,700 |
| Pluto | 248 Earth years | about 14,200 |
The farther out a world orbits, the longer its year, and not just because the path is longer: the Sun's pull is weaker out there, so the outer planets also move more slowly. In the interactive view, speed up time and watch the inner planets lap the outer ones.
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✓ Facts verified July 2026
Every figure on this page is a real, rounded value checked against primary sources. Found something out of date? See how we keep it accurate.