Mercury & Mars weigh alike
Both worlds tug at ~0.38 g, so your Mars “moonwalk” weight also works for Mercury—even though one bakes near the Sun and the other orbits farther out.
Rocky twins
Weight on Other Planets Calculator
Your Inputs
“kg on a scale” is treated as kgf (Earth weight).
Educational estimates. Gas giants & the Sun have no solid surfaces.
Immediate Answer
Mars
Enter an Earth weight to see the answer.
Try 150 lb, 70 kg, or another example.
Mass (assumed): –
Earth weight: –
Enter your Earth weight or mass to begin.
Bars show scale weight in your selected everyday unit. Dashed line marks Earth.
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All-Planets Result Table
| World | Gravity factor | Scale weight | lb | kg-style scale | Newtons |
|---|---|---|---|---|---|
| Enter a value or choose an example to fill the table. | |||||
Quick Comparison Table
These default examples are visible before you use the calculator. Multiply your Earth scale weight by the gravity factor for a fast estimate.
| World | Surface gravity | Earth gravity factor | 100 lb | 150 lb | 70 kg | 100 kg |
|---|---|---|---|---|---|---|
| Mercury | 3.70 m/s² | 0.377x | 37.7 lb | 56.6 lb | 26.4 kg | 37.7 kg |
| Venus | 8.87 m/s² | 0.905x | 90.5 lb | 135.7 lb | 63.3 kg | 90.5 kg |
| Earth | 9.80665 m/s² | 1.000x | 100.0 lb | 150.0 lb | 70.0 kg | 100.0 kg |
| Moon | 1.62 m/s² | 0.165x | 16.5 lb | 24.8 lb | 11.6 kg | 16.5 kg |
| Mars | 3.71 m/s² | 0.378x | 37.8 lb | 56.8 lb | 26.5 kg | 37.8 kg |
| Jupiter | 24.79 m/s² | 2.528x | 252.8 lb | 379.2 lb | 176.9 kg | 252.8 kg |
| Saturn | 10.44 m/s² | 1.065x | 106.5 lb | 159.7 lb | 74.5 kg | 106.5 kg |
| Uranus | 8.69 m/s² | 0.886x | 88.6 lb | 132.9 lb | 62.0 kg | 88.6 kg |
| Neptune | 11.15 m/s² | 1.137x | 113.7 lb | 170.6 lb | 79.6 kg | 113.7 kg |
| Pluto | 0.62 m/s² | 0.063x | 6.3 lb | 9.5 lb | 4.4 kg | 6.3 kg |
| Ceres | 0.27 m/s² | 0.028x | 2.8 lb | 4.1 lb | 1.9 kg | 2.8 kg |
| Sun (theoretical) | 274.0 m/s² | 27.94x | 2,794 lb | 4,191 lb | 1,955 kg | 2,794 kg |
Planet Visuals
Formula
Weight on another world = Earth weight × planet gravity factor.
For example, the Moon is about 0.166× Earth, so 150 lb on Earth feels like about 25 lb on the Moon. Mars is about 0.38× Earth, so 70 kg on Earth reads about 26.5 kg on a Mars scale.
The science version is W = m × g. Weight is a force in Newtons, mass stays the same everywhere, and g is the local surface gravity.
Earth mass (kg) from your input: - If you enter Earth weight in kg (a scale reading): mass ≈ kg_value - If you enter Earth weight in lb: mass ≈ lb × 0.45359237 - If you enter Earth weight in N: mass ≈ N ÷ g_earth - If you enter mass (kg): mass = kg Weight on a world = mass × g_world (in Newtons) Earth-relative weight factor = g_world ÷ g_earth
Scale readings in lb and kg-style units are computed from the same Earth-relative factor; Newtons are shown for the force value.
Data Sources and Assumptions
Built by Starlight Tools using standard surface gravity constants; calculations run locally in your browser and your inputs are not uploaded.
Gravity constants are based on NASA planetary fact sheet values and common reference values for the Moon, Pluto, Ceres, and the Sun. Date checked: June 29, 2026. See NASA's Space Science Data Coordinated Archive and Solar System Exploration.
Gas giants, ice giants, and the Sun do not have solid surfaces you could stand on. Their values are reference gravities used for comparison, often tied to a pressure level or standard radius. Real gravity also varies slightly with latitude, altitude, and local geology.
FAQ
How much would I weigh on Mars?
Mars gravity is about 0.378× Earth gravity. Multiply your Earth weight by 0.378: 150 lb on Earth is about 57 lb on Mars, and 70 kg on Earth reads about 26.5 kg on a Mars scale.
How much would I weigh on the Moon?
The Moon is about 0.165× Earth gravity. A 150 lb person would read about 25 lb on a Moon scale, and a 70 kg person would read about 11.6 kg.
Why do I weigh less on some planets?
Weight is force from gravity. Smaller or less dense worlds pull less strongly, so the scale reading is lower even though the amount of matter in your body is unchanged.
Is weight the same as mass?
No. Mass is how much matter you have and stays the same everywhere. Weight is force, calculated as mass × gravity, so it changes from world to world.
Can you stand on Jupiter or Saturn?
No. Jupiter and Saturn are gas giants without solid surfaces. The calculator includes them as reference comparisons, not as places where a normal bathroom scale could sit.
Why are kg used for weight?
Everyday scales often show kilograms as an Earth scale reading, even though kilograms are scientifically a mass unit. This calculator keeps kg-style scale readings for familiarity and shows Newtons for the actual force.
Space Safety
- Gas giants and the Sun don’t have solid surfaces to stand on. Their listed “surface gravity” is a standard reference for learning.
- On airless bodies, you’d need a spacesuit and a gentle landing!
5 Fun Facts about Interplanetary Weight
Venus is almost Earth
Venus clocks in at 0.904 g. A 70 kg person would appear as ~63 kg there—a barely noticeable difference until the pressure and heat remind you you’re not home.
Sneaky heavy
Saturn vs Neptune upset
Neptune’s surface gravity (1.14 g) beats Saturn’s (1.07 g) despite Saturn being larger. Density matters more than size—scan the result table or chart to see this surprise.
Density twist
Jupiter doubles you
Enter 180 lb and the Jupiter row shows ~455 lb. That’s why our chart’s dashed Earth line helps you see the more-than-2× jump at a glance.
Gas-giant gains
Ceres featherweight
On dwarf planet Ceres you’d weigh about 3% of your Earth value—50 kg becomes 1.5 kg. The calculator’s bars nearly vanish for these tiny worlds.
Microgravity wow