Age on Other Planets

How old you would be on Mars, Jupiter and every other planet.

kg or lb
16.65Age on MarsMars years
130Age on MercuryMercury years
2.64Age on JupiterJupiter years
Days alive on Earth
11,436
Age on Earth
31.31
Next Martian birthday
May 10, 2027 in 243 Earth days
Age on Neptune
0.19

A "year" is one full orbit around the Sun. Mercury zips round in 88 Earth days; Neptune takes nearly 165 Earth years, so almost nobody has a Neptunian birthday.

Your age and weight across the solar system
PlanetYear length (Earth days)Your ageNext birthdayYour weight
Mercury88130 years2026-12-0626.5
Venus224.750.89 years2026-10-0363.5
Earth365.331.31 years2027-05-2070
Mars68716.65 years2027-05-1026.4
Jupiter4332.62.64 years2030-12-19165.2
Saturn10759.21.06 years2054-04-1864.1
Uranus30688.50.37 years2079-05-2762.2
Neptune601820.19 years2160-02-2678.4
Pluto (dwarf)905600.13 years2243-04-305

About the Age on Other Planets

Your age is simply the number of times your planet has gone around the Sun since you were born. Move to Mars, where a year lasts 687 Earth days, and you are suddenly about half your age; on Mercury, with its 88-day year, you would be four times older. This calculator uses the real orbital periods of the eight planets and Pluto to convert your Earth age into planetary years, and works out the date of your next birthday on each world.

Because the calculation counts days from your date of birth, it is exact for Earth and the other planets alike. Add your weight to see how it would change under each planet's surface gravity: you would weigh a little more than double on Jupiter and only 38% as much on Mars.

It is a favourite classroom activity for teaching orbits and gravity, and a fun fact to share on your birthday.

How to use the Age on Other Planets

  1. Enter your date of birth.
  2. Optionally enter your weight in any unit to see it converted for each planet.
  3. Read your age on Mars, Mercury and Jupiter, then explore the full table including your next birthday on each planet.

Frequently asked questions

How old would I be on Mars?

Divide your age in Earth days by 687, the length of a Martian year. A 30-year-old on Earth is about 16 Martian years old.

Why is my age on Mercury so high?

Mercury orbits the Sun every 88 days, so it completes more than four orbits for every one of Earth's. Your Mercury age is roughly 4.15 times your Earth age.

Would I actually age differently on another planet?

No. Your body ages at the same biological rate wherever you are. Only the number of planetary "years" changes, because a year is defined by the planet's orbit.

Why is Pluto included?

Pluto was reclassified as a dwarf planet in 2006, but it remains a popular question. Its 248-Earth-year orbit means no human has ever had a Plutonian birthday.