Weight on Other Planets — How It Works
Have you ever wondered how much you would weigh on Mars, Jupiter, or even Pluto? Our Weight on Other Planets Calculator gives you the answer instantly. Just enter your weight and choose your preferred unit system (metric or US customary), and the tool will show your weight on every major body in the Solar System.
The Science Behind the Calculator
Your weight depends on the gravitational force acting on your body. That force is described by Newton's Law of Universal Gravitation:
F = G × M × m / r²
- F — gravitational force (your weight)
- G — gravitational constant (6.674 × 10⁻¹¹ N·m²/kg²)
- M — mass of the planet
- m — your mass
- r — radius of the planet
Since your mass never changes, only the planet's gravity (g = GM/r²) affects your weight. The calculation simplifies to:
Wplanet = Wearth × (gplanet / gearth)
Surface Gravity of Each Planet
| Body | Surface Gravity (m/s²) | Ratio to Earth |
|---|---|---|
| ☿ Mercury | 3.70 | 0.3772 |
| ♀ Venus | 8.87 | 0.9042 |
| ♁ Earth | 9.81 | 1.0000 |
| ☽ Moon | 1.62 | 0.1651 |
| ♂ Mars | 3.73 | 0.3802 |
| ♃ Jupiter | 22.96* | 2.3404 |
| ♄ Saturn | 10.44 | 1.0642 |
| ♅ Uranus | 8.69 | 0.8858 |
| ♆ Neptune | 11.15 | 1.1366 |
| ✦ Pluto | 0.62 | 0.0632 |
* Jupiter's gravity is measured at its cloud top, where g = 2.34 × gearth = 22.96 m/s².
Mass vs. Weight — What's the Difference?
These two concepts are often confused:
- Mass is an intrinsic property of matter — the amount of substance in your body. Your mass is the same everywhere in the universe, whether you're on Earth, Mars, or floating in deep space.
- Weight is the force of gravity acting on your mass. It changes depending on where you are. In the vacuum of space, far from any gravitational source, your weight would be zero — but your mass would be unchanged.
Frequently Asked Questions
How much would I weigh on Mars if I am 75 kg?
Your weight on Mars would be approximately 28.5 kg. Here's how:
- Your weight on Earth: WEarth = 75 kg
- Surface gravity on Mars: gMars = 3.73 m/s²; on Earth: gEarth = 9.81 m/s²
- WMars = 75 × (3.73 / 9.81) = 28.5 kg
On which planet would I be the heaviest?
Jupiter — thanks to its enormous mass (about 318 times that of Earth), it has the strongest surface gravity in the Solar System (excluding the Sun). At its cloud top, gJupiter = 22.96 m/s², meaning you would weigh more than twice your Earth weight.
Where would I weigh the least?
Pluto — with a surface gravity of only 0.62 m/s² (about 6.3% of Earth's), you would weigh almost nothing there. A 70 kg person would weigh only about 4.4 kg on Pluto.
Does my weight vary on Earth too?
Yes, slightly! At the poles you weigh about 1% more than at the equator. This happens because:
- The poles are closer to Earth's center (Earth is slightly flattened), increasing gravitational attraction.
- The centrifugal force from Earth's rotation is strongest at the equator and acts against gravity, effectively reducing your weight there.
Why is the Moon included?
Although the Moon is not a planet, it is the most accessible destination beyond Earth and a likely first stop for future space travelers. With only 16.5% of Earth's surface gravity, you would feel dramatically lighter there — and could jump roughly 6 times higher!