Planetary Age Calculator

Ever wondered how old you would be if you lived on Mars or Jupiter? Enter your birth date to take a trip around the solar system!

How Planetary Years Work

We measure time based on Earth's movement. A "day" is one rotation of Earth on its axis, and a "year" is one revolution of Earth around the Sun (approx. 365.25 days).

However, every planet in our solar system moves at a different speed and distance from the Sun. Kepler's laws of planetary motion describe how planets closer to the Sun orbit faster, while those further away orbit much slower.

Inner Planets (Fast Years)

  • Mercury: The fastest planet, zipping around the Sun in just 88 days. You age roughly 4 times faster here!
  • Venus: Takes about 225 days to orbit. Interestingly, its day is longer than its year!

Outer Planets (Slow Years)

  • Mars: The Red Planet takes nearly 2 Earth years (687 days) to complete an orbit.
  • Jupiter: The gas giant takes almost 12 Earth years. If you're 24 on Earth, you're only 2 on Jupiter.
  • Saturn: Takes about 29.5 years. Many people relate this to the "Saturn Return" in astrology.
  • Uranus: A lifetime on Earth (84 years) is just one year here.
  • Neptune: Takes a whopping 165 years. It hasn't even completed one orbit since its discovery in 1846 until 2011!

Related Space Tools

FAQ

Why is my age different on other planets?
A 'year' is defined by how long it takes a planet to orbit the Sun. Since other planets orbit at different speeds and distances than Earth, their years are different lengths. For example, Mercury orbits very fast (88 days), so you would be much older there!
How old would I be on Mars?
A year on Mars is about 1.88 Earth years. So, you would be roughly half your Earth age on Mars. Use our calculator to get the exact number!
What is a galactic year?
A galactic year is the time it takes for our Solar System to orbit the center of the Milky Way galaxy. It's estimated to be about 230 million Earth years!
Is Pluto included?
Yes! Even though Pluto is classified as a dwarf planet, we've included it. A year on Pluto takes 248 Earth years, so you wouldn't even be 1 year old yet!