Calculate Mars scale weight from Earth weight, reverse a Mars reading, or convert mass to force using 3.71 m/s² gravity with lb, kg, stone, and newtons.
- All Physics Calculators
- Jupiter Weight Calculator
- Mercury Weight Calculator
- Saturn Weight Calculator
- Venus Weight Calculator
- Uranus Weight Calculator
- Pluto Weight Calculator
- Moon Weight Calculator
- Surface Gravity Calculator
Mars Weight Formula
- Earth weight — your weight on a scale on Earth (lb, kg, or st)
- g_mars — gravitational acceleration on Mars, 3.71 m/s²
- g_earth — gravitational acceleration on Earth, 9.80665 m/s²
- Ratio — 3.71 / 9.80665 ≈ 0.378314715
If you have mass instead of weight, the force on Mars is:
To reverse a Mars reading, divide by 3.71 / 9.80665. The calculator uses NASA/JPL’s rounded equatorial Mars reference gravity of 3.71 m/s² and Earth standard gravity of 9.80665 m/s². Local conditions and calibration can differ. The 3.69 and 3.74 m/s² entries in the details are hypothetical sensitivity scenarios, not asserted global bounds.
Reference Tables
Quick conversions for common Earth weights:
| Earth weight | Mars weight | Mass (kg) | Force on Mars (N) |
|---|---|---|---|
| 100 lb | 37.8 lb scale | 45.4 | 168.3 |
| 150 lb | 56.7 lb scale | 68.0 | 252.4 |
| 180 lb | 68.1 lb scale | 81.6 | 302.9 |
| 200 lb | 75.7 lb scale | 90.7 | 336.6 |
| 250 lb | 94.6 lb scale | 113.4 | 420.7 |
| 70 kg | 26.5 kg-equivalent | 70.0 | 259.7 |
How Mars compares to other bodies in the solar system:
| Body | Surface gravity (m/s²) | Weight ratio vs. Earth |
|---|---|---|
| Moon | 1.62 | 0.165 |
| Mars | 3.71 | 0.378 |
| Mercury | 3.70 | 0.377 |
| Venus | 8.87 | 0.904 |
| Earth | 9.80665 | 1.000 |
| Jupiter | 24.79 | 2.528 |
Example and FAQ
Example. An Earth-calibrated scale reads 165 lb on Earth. Multiply by 3.71 / 9.80665: the corresponding Mars scale reading is about 62.4 lb. The object’s mass remains about 74.8 kg; the force on Mars is about 277.7 N.
Why is Mars gravity weaker? Mars has about 11% of Earth’s mass and a smaller radius. The combination gives a surface gravity of roughly 38% of Earth’s.
Does my mass change on Mars? No. Mass is the amount of matter in an object and stays the same anywhere. Only weight, the force gravity exerts on that mass, changes.
Would I be stronger on Mars? Supporting the same stationary mass against gravity would require about 38% of the force on Earth under this model. This is a force comparison, not a prediction of human strength or health.
What about a bathroom scale on Mars? A spring or strain-gauge scale measures force, so it would read about 0.38 of your Earth value. A balance scale that compares masses would read the same as on Earth.
