How Much Would You Weigh on Each Planet in the Solar System
Your weight isn’t a fixed property of your body: it depends on the gravity of the place where you step on the scale. Your mass (the amount of matter you have) does stay the same throughout the universe, but weight changes because it’s the result of multiplying that mass by the gravity of the planet in question. That’s why you’d weigh much less on Mars than on Earth, and much more on Jupiter. Here are the exact figures for each planet in the solar system.
Why weight changes from one planet to another
The formula is simple: weight = mass × gravity. On Earth, gravity is 9.8 m/s², and that’s the reference we use every day without thinking about it. Each planet has its own surface gravity, determined by its mass and radius. A very massive but very large planet (like Jupiter) has a lower surface gravity than its mass would suggest, because its surface is farther from its center. This planetary gravity figure is the key to all the calculations that follow.
The gravity table for each planet (relative to Earth)
To calculate your weight on each planet, you only need to multiply your Earth weight by this relative gravity factor:
- Mercury: 0.378
- Venus: 0.907
- Earth: 1.000
- Mars: 0.377
- Jupiter: 2.528
- Saturn: 1.065
- Uranus: 0.886
- Neptune: 1.137
- The Moon: 0.166
If you weigh 70 kg on Earth, on Mars you would weigh 70 × 0.377 = 26.39 kg. On Jupiter, 70 × 2.528 = 176.96 kg. That’s how simple the calculation is, planet by planet.
How much you’d weigh on Mars, exactly
Mars is science fiction’s favorite planet and also the most realistic destination for a future human mission, so it deserves its own section. Its gravity is 3.71 m/s², 37.7% of Earth’s. This means that if you weigh 60 kg, on Mars you’d weigh 22.62 kg; if you weigh 80 kg, you’d weigh 30.16 kg; and if you weigh 100 kg, you’d weigh 37.70 kg. You could jump almost three times as high as on Earth with the same muscular effort, something future Mars mission astronauts will need to specifically train for.
The giant planets: where you’d weigh more
Jupiter is the undisputed king: with a gravity of 24.79 m/s², it’s the only planet in the solar system where you’d weigh more than double your Earth weight. Someone weighing 70 kg would weigh almost 177 kg there, a weight that would make walking a brutal effort for muscles and joints. Neptune would also make you heavier, though by a more modest margin: 13.7% more than on Earth. Saturn, despite being the second-largest planet, would barely make you weigh 6.5% more, because its enormous size offsets much of its mass.
The planets where you’d feel lighter
Mercury and Mars are practically twins in this respect: on both you’d weigh around 37-38% of your Earth weight. Uranus and Venus stay close to 90%, so the difference there would be much less dramatic. But the true champion of lightness isn’t a planet, it’s the Moon: with only 16.6% of Earth’s gravity, someone weighing 70 kg would weigh barely 11.62 kg. That’s why Apollo astronauts could make those characteristic bounces across the lunar surface.
Weight vs. mass: the confusion worth clearing up
When you say “I weigh 70 kg,” you’re actually using the kilogram as a unit of mass, not weight (weight is technically measured in newtons). But in everyday language the kilogram works as a synonym for weight because on Earth gravity is constant and we don’t notice it. Your mass of 70 kg is the same on Mars, on the Moon, or floating in space: what changes is the force with which gravity pulls you toward the ground, which is what we perceive as “weighing more” or “weighing less.” If you want to dig deeper into how the planets’ own masses compare to each other, you can check out how much Earth weighs compared to other planets in the solar system.
How to calculate your weight on any planet, step by step
The full process is this:
- Write down your current weight in kilograms.
- Look up the relative gravity factor of the planet you’re interested in from the table above.
- Multiply your weight by that factor.
- The result is your approximate weight on that planet, also expressed in kilograms.
If you need to express that result in pounds, for example to compare figures in imperial units, you can use Glosaria’s tool to convert kilograms to pounds and get the figure instantly, without manual calculations.
Why this matters beyond curiosity
It’s not just a fun fact to impress people at dinner. Understanding planetary gravity is essential for designing spacesuits, calculating the structural stress on a lunar or Martian base, or planning how much fuel a rocket needs to launch from the surface of each world. If you’re also interested in the scale of the distances separating these planets, this other article in the cluster explains the distance between the planets in the solar system in different units, a good complement for getting a complete picture of the cosmic neighborhood.
Frequently asked questions
How much would you weigh on Mars if you weigh 70 kg on Earth?
You would weigh 26.39 kg, because Mars’s gravity is equal to 37.7% of Earth’s gravity.
On which planet would you weigh the most?
On Jupiter, where gravity is 2.528 times that of Earth. Someone weighing 70 kg would weigh almost 177 kg on its surface.
On which planet would you weigh the least?
Among the planets, on Mercury and Mars, both with gravity close to 37-38% of Earth’s. But if we count the Moon, you’d weigh even less there: only 16.6% of your Earth weight.
Why wouldn’t you weigh much more on Saturn if it’s a giant planet?
Because its enormous size pushes the surface farther from the center of mass, reducing surface gravity. Its relative gravity factor is only 1.065, just 6.5% more than Earth.
Does my body mass change when I travel to another planet?
No. Your mass always stays the same; the amount of matter that makes up your body doesn’t change. What changes is your weight, which depends on the force of gravity acting on that mass on each planet.