How it works
Your weight on Earth is determined by Earth's gravity pulling on your mass. Every other planet and celestial body has its own gravitational pull—some stronger, some weaker. This calculator multiplies your Earth weight by the gravity ratio of your destination to show what you'd weigh there.
The gravity ratio is expressed as a decimal relative to Earth's gravity (1.0 g). The Moon pulls with only 0.165 times Earth's strength, so you'd weigh much less. Jupiter pulls with 2.36 times Earth's strength, so you'd feel significantly heavier. The Sun's surface gravity is 27.0 times Earth's—imagine weighing 27 times more.
The formula
Weight on planet = Earth weight × Gravity ratio of destination
Worked example
Let's say you weigh 70 kg on Earth and want to know your weight on Mars.
Step 1: Identify your Earth weight.
Your weight = 70 kg
Step 2: Find Mars's gravity ratio.
Mars gravity = 0.378 g (compared to Earth's 1.0 g)
Step 3: Multiply.
Weight on Mars = 70 × 0.378 = 26.46 kg
On Mars, you'd weigh about 26.5 kg—roughly 38% of your Earth weight. You'd be able to jump much higher and move more easily because gravity's pull is weaker.
Now let's try Jupiter.
Step 1: Your Earth weight = 70 kg
Step 2: Jupiter's gravity ratio = 2.36 g
Step 3: Weight on Jupiter = 70 × 2.36 = 165.2 kg
On Jupiter, you'd weigh 165.2 kg—more than double your Earth weight. Every movement would feel sluggish, and standing upright would be exhausting.
One more: the Moon.
Step 1: Your Earth weight = 70 kg
Step 2: Moon's gravity ratio = 0.165 g
Step 3: Weight on Moon = 70 × 0.165 = 11.55 kg
On the Moon, you'd weigh only 11.55 kg. This is why astronauts in footage from the Moon appear to bounce and float—they're experiencing just one-sixth of Earth's gravity.
Things to watch
Remember that weight and mass are not the same. Your mass—the actual amount of matter in your body—never changes no matter where you go. Your weight changes because gravity changes. If you weigh 70 kg on Earth, your mass is always about 70 kg, but your weight on Mars drops to 26.5 kg because Mars's gravity is weaker. This is why astronauts feel "weightless" in orbit—they're still falling toward Earth, so gravity doesn't push them against the ground.
Also note that these gravity values are theoretical surface values. In reality, you can't stand on the Sun or Jupiter's surface (Jupiter has no solid surface), but the calculator shows what the physics would predict if you could.