Solar Age & Weight Calculator

It calculates your age on different planets in the solar system based on your Earth age and, optionally, adjusts your weight according to each planet's gravity. You'll discover how old you would be and what you would weigh on each planet, along with interesting facts about each celestial body.

Your age on each planet is calculated by comparing Earth's orbital period (365.25 days) to that planet's orbital period. For example, since Mercury takes only 88 days (0.24 Earth years) to orbit the Sun, you would have experienced many more birthdays on Mercury than on Earth!

Your weight on each planet is calculated using that planet's surface gravity relative to Earth's gravity (1.0). For example, on Mars, the gravity is about 0.38 of Earth's, so you would weigh only 38% of your Earth weight. On Jupiter, with 2.34 times Earth's gravity, you would weigh more than twice your Earth weight!

The rate at which you age on each planet depends on how long it takes that planet to complete one orbit around the Sun (its "year"). The farther a planet is from the Sun, the longer its orbital period, and thus the fewer "years" you would have experienced there. That's why you're much younger in Neptune years than in Mercury years!

While Pluto was reclassified as a dwarf planet in 2006, we've included it because of its historical significance and continued public interest. It's a fascinating celestial body that helps demonstrate the extreme variations in orbital periods and gravity in our solar system - one Pluto year is 248.09 Earth years!

No, most planets in our solar system are inhospitable to human life. The temperatures shown for each planet give you an idea why - from Venus's scorching 880°F to Neptune's frigid -373°F! Plus, many planets lack a solid surface or have toxic atmospheres. Our calculations are just for fun and educational purposes.

We display distances in millions (M) and billions (B) of miles to make the vast distances of space more comprehensible. These distances help illustrate why planets have different orbital periods - the farther a planet is from the Sun, the longer it takes to complete one orbit.

For planets with very short orbital periods like Mercury, your age might be quite large in planet-years. Conversely, for planets with very long orbital periods like Neptune, your age might be less than one planet-year. We show months in these cases to make the numbers more meaningful and easier to understand.

Yes! We use precise orbital periods and gravity values based on NASA data. The orbital periods are measured in Earth years (e.g., Mercury = 0.24 years, Venus = 0.62 years), and the gravity values are relative to Earth's gravity (e.g., Mars = 0.38 of Earth's gravity, Jupiter = 2.34 times Earth's gravity).

Each planet card includes an interesting fact that highlights unique characteristics of that world. For example, did you know that Venus spins backwards compared to most planets? Or that Mars has the largest volcano in the solar system? These facts are curated to help make your journey through the solar system more engaging and educational!