Mars
About 38% of Earth weight
A 150 lb Earth reading becomes about 57 lb on Mars. A 70 kg Earth reading becomes about 26.6 kg on a Mars-calibrated scale.
Solar system · Question
Mars weight calculator: your weight on every planet
On Mars, a scale would read about 38% of your Earth weight. Enter your weight once to compare Mars with all eight planets — your mass stays the same, but local gravity changes what the scale reads.
Visual model
Your weight, everywhere.
on Earth
Mercury
17.1 kg
0.38× Earth gravity
Venus
41.0 kg
0.91× Earth gravity
Earth
45.0 kg
1.00× Earth gravity
Mars
17.1 kg
0.38× Earth gravity
Jupiter
106.2 kg
2.36× Earth gravity
Saturn
41.4 kg
0.92× Earth gravity
Uranus
40.0 kg
0.89× Earth gravity
Neptune
50.4 kg
1.12× Earth gravity
Change one variable
Why doesn't 318× the mass mean 318× the gravity?
Change a planet's mass or radius independently to see why gravity depends on both. The 3D test bench shows a sphere alongside a same-unit Earth-radius reference and a test probe released under model gravity. A smaller 2D radius reference remains below.
g / gEarth = (M / MEarth) ÷ (R / REarth)²
Build your own gravity world.
Keep the camera's reference sphere at Earth radius. Change mass and radius, then release both the amber model probe and cyan Earth-baseline probe from the same 0.65-Earth-radius height above their reference radii. Which reaches its reference surface first?
Reduced-motion preference: the drop animation is unavailable; adjust mass and radius to compare static results.
Optional test bench. The mathematical model and 2D radius figure below remain readable.
Surface colors, grain and the lighting halo are artist styling, not real clouds, material measurements or a planet photograph. The body is a hypothetical non-rotating sphere with adjustable mass and radius, not an identified planet or observed surface. The translucent teal sphere has a fixed radius of 1 Earth radius. An amber model probe and cyan Earth-reference probe begin 0.65 Earth radii above each sphere’s reference radius and independently follow the same dimensionless GM/r² integration; animation time is deliberately compressed and is not a measured fall duration. For Jupiter-like gas giants there is no solid surface to land on; the sphere is a reference radius only.
The gold line connects the black center point to the rust-red surface point: that distance is the planet's radius, R. The circle uses a linear Earth-relative radius scale (7.5 SVG units per Earth radius); the small Earth baseline is intentionally small. The circle does not encode mass or real appearance. The red arrow shows the direction of gravity, not its strength.
Mass1.0÷ radius²1.00
Idealized gravity
At Earth baseline, mass and radius are both 1. The gravity ratio is 1.
This is a spherical, non-rotating model, not measured effective gravity. Jupiter has ~317.8× Earth's mass and ~11.21× its equatorial radius, giving ~2.53× by this model. NASA reports ~2.36× effective equatorial gravity at Jupiter's 1-bar atmospheric reference level; rotation matters. Jupiter has no solid surface. NASA gravity equation ↗ · NASA Jupiter/Earth data ↗
Preparing the experiment. The equation and Earth baseline are readable now.
Quick answers
Planet weight calculator: the useful numbers first.
These are illustrative Earth-scale-equivalent readings based on NASA effective equatorial gravity ratios (Earth = 1.00). The calculator updates them for the kg or lb value entered; it does not model standing on gas giants.
Jupiter
About 2.36× Earth weight
NASA’s effective equatorial gravity at Jupiter’s atmospheric 1-bar level is about 2.36× Earth’s, not a solid ground surface a person could stand on.
Formula
Earth reading × gravity ratio
For a familiar scale reading, multiply your Earth value by the planet's gravity relative to Earth. Mass itself does not change when you move between planets.
What's simplified
Why isn't this just "bigger planet, more gravity"?
01
Density matters too
Saturn is bigger than Earth but less dense than water — its effective equatorial gravity (~0.92×) is slightly less than Earth's, while much smaller Mercury and much larger Neptune land close together too.
02
"Surface" is fuzzy on gas giants
Jupiter, Saturn, Uranus, and Neptune have no solid surface — the calculator uses NASA’s approximate equatorial effective gravity at a reference atmospheric level, not a solid surface. Gravity depends on latitude, rotation and altitude.
Misconception check
Quick check.
Quick check
Try the gravity in motion: Gravity Lab — walk and jump under nine gravity settings ↗. A common takeoff speed lets you compare the jump arc, not just your weight.
Go deeper
Keep exploring.
Next in this series →
Planetary temperatures ↗
Why Venus is hotter than Mercury.
Orbits
Why don't planets fall into the Sun?
Gravity's other job: keeping planets in orbit instead of pulling them straight in.
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