Age on Other Planets

How old you are on Mercury, Venus, Mars, Jupiter and other planets and when your next birthday on each of them will be.

What to find:

from the date of birth

from the age in Earth years

A year on a planet is the time it takes to orbit the Sun. The farther the planet, the longer its year.

The age on other planets calculator shows how old you would be on Mercury, Venus, Mars, Jupiter and the other planets of the Solar System, and when your next birthday on each of them will come.

How it works

A year on a planet is the time of one full orbit around the Sun. The age on a planet is the number of Earth days lived divided by the length of that planet's year:

age = ^{days lived}/_{orbital period of the planet, days}

Planet	Year, Earth days	Planet	Year, Earth days
Mercury	87.97	Saturn	10,759
Venus	224.7	Uranus	30,685
Earth	365.26	Neptune	60,189
Mars	686.98	Pluto	90,560
Jupiter	4332.6

By Kepler's third law, the farther a planet is from the Sun, the longer its year: on Mercury a student would celebrate four birthdays a year, while on Neptune nobody lives to their first.

Example. A 14-year-old has lived 14 · 365.26 ≈ 5114 days. On Mars that is 5114 / 686.98 ≈ 7.4 years, on Jupiter 5114 / 4332.6 ≈ 1.2 years.