Mars Age & Weight Calculator
Because Mars has a different orbit and mass than Earth, your age and weight change dramatically the moment you land.
Quick Answer
A year on Mars is 687 Earth days (almost twice as long), making your Martian age nearly half of your Earth age. Mars also has only 38% of Earth's gravity, so you would weigh significantly less on the Red Planet.
Your Martian Profile
The Science Behind Your Mars Age and Weight
When colonists finally arrive on Mars, they will experience a profound shift in how they measure time and experience physics. The fundamental differences between Earth and Mars govern these changes.
Why Are You Younger on Mars?
Age is a measure of how many times a planet has completed a full orbit around the sun since you were born. Mars is further from the Sun (averaging 142 million miles away, compared to Earth's 93 million miles). Because of this greater distance, it has a larger orbit and travels at a slower speed. It takes Mars 687 Earth days to complete one revolution. Therefore, you accumulate "Mars years" at roughly half the rate you accumulate Earth years.
The Gravity Deficit: Why You Weigh Less
Mass and weight are not the same thing. Your mass (the amount of matter in your body) remains constant no matter where you are in the universe. However, your weight is the force exerted on your mass by gravity.
Mars is significantly smaller than Earth—it has about 11% of Earth's mass and 53% of its diameter. This results in a surface gravity that is only 37.8% of what we feel on Earth. If you stand on a scale on Mars, the planet pulls down on you with less force, making you feel incredibly light. While this might sound fun for jumping high, it poses serious medical challenges for long-term survival, requiring intense daily exercise to prevent muscle atrophy and osteoporosis.
Frequently Asked Questions
Yes. Like Earth, Mars has an axial tilt (25.2 degrees compared to Earth's 23.5 degrees), which means it experiences four seasons. However, because a Martian year is longer, the seasons on Mars last nearly twice as long as they do on Earth.
No. Your biological aging process remains the same. A "Mars year" is just a calendar measurement. If you live to be 80 Earth-years old, you will still have lived the exact same amount of time, but your passport would say you are roughly 42 Mars-years old.