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Planet Age Calculator
How old would you be on Mars, Jupiter or Mercury?
Based on each planet’s average orbital period around the Sun, measured in Earth years.
Your age on other planets
A “year” is simply the time a planet takes to go around the Sun once. Earth does it in about 365.25 days, but Mercury needs only 88 days, while Neptune takes almost 165 Earth years. So your age depends on which planet you count it on. This calculator converts your time alive into years on every planet in the solar system.
How long is a year on each planet?
| Planet | Length of one year |
|---|---|
| Mercury | about 88 Earth days |
| Venus | about 225 Earth days |
| Earth | 365.25 days |
| Mars | about 687 Earth days |
| Jupiter | about 11.9 Earth years |
| Saturn | about 29.4 Earth years |
| Uranus | about 84 Earth years |
| Neptune | about 164.8 Earth years |
Fun facts
- On Mercury, a 20-year-old would be about 83
- Nobody alive today has completed a full year on Neptune, since it was discovered in 1846 and finished its first observed orbit in 2011
- A Jupiter year lasts almost 12 Earth years, so most people are only a few Jupiter years old
- Mars birthdays come roughly every 22 to 23 months
Back on Earth, find out how old any star was on a certain date with our celebrity age on any date tool.