How long is a year on Mercury?
Data as of July 2026
88 Earth daysone orbit of the Sun
A year on Mercury, one full trip round the Sun, lasts 88 Earth days, or 0.24 Earth years. Counted in Mercury's own days (sunrise to sunrise), that is 0.5 Mercury days.
▶ Watch Mercury orbit in 3D
What a Mercury year means
Mercury is the fastest planet, racing round the Sun at about 47 km/s, which is why its year is so short. Its day is the strange part: one sunrise to the next takes two of its years.
One year
88 Earth days
In Earth years
0.24
In Mercury days
0.5
If you are 30 on Earth
you'd be 125 in Mercury years
Distance from the Sun
0.39 AU
A day there
176 Earth days
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.
Keep going
✓ 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 Found something out of date?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.