Weight on Other Planets Calculator
What you'd weigh across the Solar System.
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Step onto another world and the scales would read very differently. Enter your weight on Earth and this calculator shows what you'd weigh on the Moon, Mars, the gas giants, and even the Sun — because each has its own gravity.
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Weight on Planets — The Quick Answer
Your weight on another world is your Earth weight multiplied by that world's surface gravity relative to Earth. On the Moon you'd weigh about 1/6 as much; on Mars about 38%.
Shortcut
Weight elsewhere = Earth weight × (surface gravity ÷ 9.81)
Surface gravity relative to Earth
| Body | Gravity (× Earth) | 70 kg becomes |
|---|---|---|
| The Moon | 0.17 | 11.6 kg |
| Mars | 0.38 | 26.6 kg |
| Jupiter | 2.53 | 177 kg |
| Saturn | 1.06 | 74.5 kg |
| Pluto | 0.06 | 4.4 kg |
| The Sun | 27.9 | 1,955 kg |
Your mass — the amount of matter in you — never changes. Only weight, the force of gravity on that mass, varies from world to world. That's why astronauts can bound across the Moon.
How It Works
The Formula
Scaling by surface gravity
Formula
Weight on body = Earth weight × (g_body ÷ g_Earth) g_Earth = 9.81 m/s²
Variables
Surface gravity
The gravitational acceleration at that world's surface — 1.62 m/s² on the Moon, 24.79 m/s² on Jupiter.
Earth's gravity
9.81 m/s², the reference. Dividing by it turns each gravity into a simple multiplier.
What the scales read
The force of gravity on your unchanging mass — this is what differs between worlds.
Note: For gas giants like Jupiter and Saturn, 'surface' gravity is measured at the cloud tops, since they have no solid surface to stand on.
Worked Example: A 70 kg Person on Mars
Scaling Earth weight by Mars's gravity
Find Mars's gravity ratio
Mars surface gravity 3.72 m/s² ÷ Earth's 9.81 m/s² = 0.38.
Scale your Earth weight
70 kg × 0.38 ≈ 26.6 — what a scale on Mars would read.
Note what didn't change
Your mass is still 70 kg. Only the weight — gravity's pull on that mass — dropped.
Reference Guide
| Body | Gravity (× Earth) | 70 kg reads |
|---|---|---|
| The Moon | 0.17 | 11.6 kg |
| Mars | 0.38 | 26.6 kg |
| Jupiter | 2.53 | 177 kg |
| Saturn | 1.06 | 74.5 kg |
| The Sun | 27.9 | 1,955 kg |
Mass vs Weight, and Where You'd Feel It
The number on the scale changes; the matter in you doesn't
The amount of matter in you doesn't change between worlds — only the gravity acting on it does.
Best for: Understanding why the scale reads differently
You'd weigh a fraction as much and could jump far higher — though your full inertia means heavy objects are still hard to shove.
Best for: Picturing life on the Moon or Mars
Weight multiplies from about 2.5× up to ~28×; standing would be crushing, and gas giants have no surface to stand on anyway.
Best for: Appreciating extreme gravity
Common Mistakes
Confusing mass with weight
Your mass in kilograms is unchanged in space; weight is the force gravity exerts on it. This calculator scales weight — your amount of matter never moves.
Expecting to weigh nothing in space
Weightlessness in orbit is free-fall, not zero gravity. On a planet's surface you still have a definite weight set by its gravity.
Treating gas-giant gravity as solid ground
Jupiter and Saturn's quoted gravity is at the cloud tops — there's no surface to stand on, so the 'weight' is a reference figure.
Forgetting inertia doesn't drop with weight
On the Moon you weigh a sixth, but your mass still resists motion fully — a heavy object is just as hard to shove, even if easy to lift.
Research & Citations
Sources and standards referenced for the factual claims on this page
- [nasa]
NASA / NSSDCA (D. R. Williams) (2024). Planetary Fact Sheet — surface gravity of Solar System bodies. NASA Goddard Space Flight Center.
Source of the surface-gravity ratios used to scale weight for each world.
- [newton]
Newton, I. (1687). Philosophiæ Naturalis Principia Mathematica — law of universal gravitation.
Weight is the gravitational force (F = m·g); g varies by body, mass does not.
This calculator is a reference tool, not a substitute for professional advice. Verify important health, financial, legal, or safety decisions with a suitably qualified professional.
Last updated: October 8, 2026
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Frequently Asked Questions
How much would I weigh on Mars?
About 38% of your Earth weight, because Mars's surface gravity is 3.72 m/s² versus Earth's 9.81. A 70 kg person would weigh the equivalent of about 26.6 kg on Mars.
Why does my weight change but not my mass?
Mass is the amount of matter in you and stays constant everywhere. Weight is the force of gravity acting on that mass, so it changes with the strength of gravity. On a weaker-gravity world, the same mass weighs less.
Where would I weigh the most?
Of the places in this calculator, the Sun by far — its surface gravity is about 28 times Earth's, so you'd 'weigh' nearly 28 times as much (if you could survive). Among planets, Jupiter is highest at about 2.5 times Earth.
Would I really float on the Moon?
Not float, but you'd feel very light — about one-sixth your Earth weight. That's why Apollo astronauts could leap and bound in their heavy suits; the Moon's gravity is just 1.62 m/s².