Age on Other Planets Calculator
Find out how old you'd be on each planet, based on how long it takes to orbit the Sun.
A "year" is one trip around the Sun, and every planet takes a different amount of time. Zip around close-in Mercury and you'd rack up birthdays fast; out on Neptune, you haven't finished a single lap unless you're pushing 165.
| Mercury | 124.58 yrs |
| Venus | 48.76 yrs |
| Mars | 15.95 yrs |
| Jupiter | 2.53 yrs |
| Saturn | 1.02 yrs |
| Uranus | 0.36 yrs |
| Neptune | 0.18 yrs |
| Pluto | 0.12 yrs |
How it works
One year is simply the time it takes a planet to circle the Sun once. Earth does it in 365 days, but Mercury whips around in under three months while Neptune plods along for almost 165 Earth years per lap.
To find your age on another planet, the tool divides your Earth age by that planet's orbital period measured in Earth years. Mercury's period is about 0.24 years, so you'd have completed far more Mercury-years than Earth-years.
Enter your age and the table shows your age on every planet at once. Kids love seeing they'd be over a hundred on Mercury but not even one on Neptune.
Frequently asked questions
Why am I so much older on Mercury?
Mercury zips around the Sun in only about 88 Earth days, so it fits roughly four of its years into every one of ours. Your Mercury age is your Earth age divided by 0.24.
Could I be less than one year old on a planet?
Yes — on the outer planets. Neptune takes nearly 165 Earth years to orbit once, so unless you've lived that long you haven't completed a single Neptune year.
Is this the same as how much I'd have aged biologically?
No. Your body still ages at the same rate; this just re-counts your birthdays using another planet's year length. It's a fun comparison, not a change in how old you actually are.