Weight on Other Planets Calculator
See what an Earth scale reading would become on every planet, Pluto, the Moon, and Ganymede using their different gravitational pulls.
Your mass stays the same; the pull of gravity changes
Enter the number shown by a scale on Earth. The calculator multiplies that reading by the destination's gravity relative to standard Earth gravity.
Kilograms, pounds, and stone are treated as familiar scale readings. The result is shown in the same unit, with the actual gravitational force also reported in newtons.
How to use the weight on other planets calculator
- Enter your Earth scale reading: Use kilograms, pounds, or stone.
- Choose a destination: Feature one planet or moon in the large result panel.
- Calculate: Review the equivalent scale reading, gravity ratio, acceleration, and weight force.
- Compare every destination: The result grid uses the same Earth value for all ten worlds.
Formula: how weight changes with gravity
Weight is the gravitational force acting on mass. Near a body's surface, the force is W = m × g. Your mass does not change when you travel, but the local gravitational acceleration does.
A weight on other planets calculator determines your weight by multiplying your mass by a planet’s surface gravity. For example, a person who weighs 100 pounds (45.4 kg) on Earth would weigh about 38 pounds on Mars and 236 pounds on Jupiter, based on their approximate surface gravity.
Equivalent reading = Earth reading × gdestination / gEarth
Weight force = mass × gdestination
Surface gravity = GM / r2
This page uses the standard Earth value of 9.80665 m/s². A calibrated bathroom scale normally displays a mass-equivalent unit such as kilograms or pounds, so the calculator reports the number that an Earth-calibrated scale would show under the destination's gravity.
NASA explains the same distinction in its weight equation guide: mass stays fixed while weight varies with gravitational acceleration.
Mass, scale reading, and weight force: what changes?
The calculator shows an equivalent Earth-calibrated scale reading, but that is different from both mass and scientific weight force. The distinction matters when you compare people, luggage, tools, or other equipment across worlds.
| Quantity | What it tells you | Typical unit | 70 kg person on Mars |
|---|---|---|---|
| Mass | Amount of matter and resistance to acceleration | kilogram (kg) | 70 kg — unchanged |
| Equivalent scale reading | What an ideal scale retaining its Earth calibration would indicate | kg, lb, or st equivalent | 26.48 kg equivalent |
| Weight force | The local gravitational force acting on the mass | newton (N) | 259.7 N |
Working backward: divide a destination scale reading by that world's Earth-gravity ratio to estimate the corresponding Earth reading. A scale recalibrated for local gravity could still report the 70 kg mass; this calculator intentionally keeps the Earth calibration so worlds can be compared consistently.
Reference: NIST's guide to mass and weight identifies the kilogram as a mass unit and the newton as the SI unit of weight force.
Planet and moon gravity comparison
The multiplier is the destination's gravity divided by standard Earth gravity. Multiply any Earth scale reading by this number.
| Destination | Type | Gravity | Earth multiplier | 100 kg becomes |
|---|
Why planet size alone does not determine surface gravity
Surface gravity follows g = GM / r². More mass strengthens gravity, while a larger radius puts the surface or reference level farther from the center. Density, rotation, and the chosen measurement convention also help explain results that may look surprising.
| Comparison | Gravity used here | What it shows |
|---|---|---|
| Mercury and Mars | 3.70 vs. 3.71 m/s² | Different masses and radii can produce almost identical surface gravity. |
| Venus and Uranus | Both 8.87 m/s² | Similar gravity does not imply similar size, structure, or composition. |
| Saturn and Earth | 10.44 vs. 9.80665 m/s² | Saturn's enormous radius keeps its reference gravity surprisingly close to Earth's. |
| Jupiter | 24.79 m/s² | It has the strongest reference gravity in this calculator: about 2.53 times standard Earth gravity. |
When comparing sources: check whether a value is mean, equatorial, polar, or effective gravity. For gas and ice giants, also check the stated reference level because there is no solid surface on which to place a scale.
Data reference: NASA/JPL Planetary Physical Parameters.
Two quick examples
75 kg on Mars
75 × (3.71 ÷ 9.80665) = 28.4 kg. Mass is still 75 kg; 28.4 kg is the equivalent Earth-calibrated scale reading.
150 lb on the Moon
Using 1.624 m/s² for lunar gravity, 150 × (1.624 ÷ 9.80665) = 24.8 lb.
How to interpret the results
Gas giants have no solid surface
Jupiter, Saturn, Uranus, and Neptune use published equatorial or reference-level gravity. The result is a comparison, not a place where a person could stand.
Gravity is not perfectly uniform
Rotation, latitude, altitude, and local geology can change measured gravity slightly. This calculator uses one representative value per world.
Feeling lighter is not losing mass
Your inertia and amount of matter remain unchanged. Only the gravitational force—and therefore the scale reading—changes.
How gravity affects lifting, jumping, walking, and falling
A lower scale reading does not make mass disappear. Gravity changes the downward force that must be supported, while the same object keeps its inertia and still resists being started, stopped, or turned.
| Activity | What changes | Useful comparison |
|---|---|---|
| Holding or lifting | The downward force falls with local gravity, but the object's mass and inertia do not. | A 15 kg backpack has a 5.68 kg-equivalent reading on Mars and 2.48 kg-equivalent on the Moon. |
| Jumping | With the same takeoff speed, ideal jump height is approximately inversely proportional to gravity. | About 2.64× Earth height on Mars and 6.04× on the Moon. |
| Walking or running | Supporting force, traction, balance, and stride change; inertia remains. | Less downward force can reduce grip, so lighter does not automatically mean easier control. |
| Falling 1 meter | Ignoring air resistance, fall time is t = √(2h/g). | About 0.45 s on Earth, 0.73 s on Mars, and 1.11 s on the Moon. |
Idealized comparison: these figures are not predictions of human performance. Atmosphere, terrain, footwear, spacesuits, biomechanics, technique, and safety limits all matter. Standing, jumping, and walking examples do not apply literally to gas or ice giants because they lack solid surfaces.
Learn more: NASA explains that the Moon's gravity is about one-sixth of Earth's in its Top Moon Questions, while its free-fall guide explains how local gravity and atmospheric drag affect falling motion.
Frequently Asked Questions
How do I calculate my weight on another planet?
Multiply your Earth scale reading by the ratio of the destination's gravity to Earth's standard gravity: Earth reading × gdestination ÷ 9.80665. This conversion is the same equation the calculator applies, and the result stays in your chosen unit.
Is mass the same as weight?
No. In physics, mass describes how much matter an object contains and stays constant wherever it goes. Weight is the gravitational force acting on that mass, so body weight changes with the gravitational acceleration at the chosen celestial body.
How much would 75 kilograms weigh on Mars?
About 28.4 kg as an equivalent Earth-calibrated scale reading. The calculation is 75 × (3.71 ÷ 9.80665). The person's mass remains 75 kg, while their weight force on Mars is about 278 newtons.
Where would I weigh the most?
Of the Solar System destinations included here, Jupiter has the largest reference gravity at about 2.53 times standard Earth gravity. It is stronger than the reference values used for Saturn, Uranus, and Neptune. Jupiter has no solid surface, so this is a reference-level comparison rather than a literal standing weight.
Why can a smaller world have stronger gravity than expected?
Surface gravity depends on both mass and distance from the center. A body's density and radius matter because gravity follows GM/r². Mercury and Venus illustrate the point: their gravity reflects mass and radius together, not diameter alone. This is why total size by itself does not tell you what a scale would read.
Why might another calculator give a slightly different result?
Sources may use mean, polar, equatorial, or effective gravity, and gas-giant values depend on the chosen reference level. Rounding also matters. This page states the acceleration used for every destination so the result can be reproduced.
How much would I weigh on the Moon?
The Moon's gravity is about 16.56% of standard Earth gravity, so multiply your Earth scale reading by 0.1656. A 70 kg reading becomes about 11.59 kg, while a 150-pound (lb) reading becomes about 24.84 lb. Your mass stays unchanged; only the gravitational force and equivalent scale reading decrease.
Would I be weightless in orbit?
Not because gravity disappears. An orbiting spacecraft and everything inside it—including an astronaut—are continuously falling together around the planet, so there is almost no supporting force and the occupants experience apparent weightlessness. This calculator compares surface or reference-level gravity, not the apparent weight inside an orbiting spacecraft.
Data sources and assumptions
Planetary and Pluto values use published NASA/JPL physical parameters. Moon and Ganymede gravity are calculated from JPL's published GM and mean-radius values. Standard Earth gravity is 9.80665 m/s².
- NASA/JPL Planetary Physical Parameters — equatorial gravity for the planets and Pluto.
- NASA/JPL Planetary Satellite Physical Parameters — GM and radius for the Moon and Ganymede.
- NASA Space Place: How Do We Weigh Planets? — an accessible explanation of mass, gravity, and weight.
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