Weight on Other Planets Calculator
Enter your mass once and instantly compare your weight on every major body in the solar system — mass never changes, but weight (the force gravity pulls with) is different everywhere.
Reviewed by the ToolNestr Editorial Team — July 2026
Enter a mass — your weight on every body solves at once. Mass stays the same everywhere; only weight (the force) changes.
| Body | g (m/s²) | Weight (N) | Weight (lbf) |
|---|
Single-body solver
Pick a body and solve W, m or g from the other two — leave one field blank.
Two ideas that trip students up
1. Same mass, different pull
Three identical spheres (same mass), each with a weight arrow scaled to a different world's gravity: the Moon (short, grey), Earth (medium, blue) and Jupiter (long, red). The sphere never changes — only the pull does.
2. Surface gravity across worlds
Bar heights compare surface gravity g for the Moon, Earth and Jupiter — the direct driver of how much any given mass weighs on each body.
Weight and gravity graphs
How it works
The core idea in one line: mass is how much matter you have and never changes; weight is the force gravity exerts on that mass, W = mg, and it is different on every world because g is different everywhere.
W = m × g
weight (force) from mass and local surface gravity
g = GM / r²
surface gravity from a body’s mass M and radius r
Because g = GM/r² depends on a planet’s mass and radius together, no two bodies pull with quite the same strength. Swap g for any body into W = mg and the same mass produces a completely different weight — from a fraction of your Earth weight on the Moon or Pluto to more than double it on Jupiter.
Worked example 1 — Earth vs the Moon
Given: A person with mass m = 70 kg. Earth’s surface gravity g = 9.81 m/s², the Moon’s g = 1.62 m/s².
Mass (70 kg) is identical on both bodies — only the force gravity applies to it changes.
Worked example 2 — the same person on Jupiter
Given: Same 70 kg person. Jupiter’s surface gravity g = 24.79 m/s².
Jupiter’s immense mass overwhelms its larger radius, giving it the strongest surface gravity of any planet in the solar system.
Surface gravity and a 70 kg person’s weight, by body
Same mass (70 kg) throughout — only g changes. Sorted by distance from the Sun.
| Body | gm/s² | Weight of 70 kgN |
|---|---|---|
| Mercury | 3.70 | 259.0 |
| Venus | 8.87 | 620.9 |
| Earth ★ | 9.81 | 686.7 |
| Moon | 1.62 | 113.4 |
| Mars | 3.71 | 259.7 |
| Jupiter | 24.79 | 1735.3 |
| Saturn | 10.44 | 730.8 |
| Uranus | 8.69 | 608.3 |
| Neptune | 11.15 | 780.5 |
| Pluto | 0.62 | 43.4 |
★ Earth reference. Values use standard surface-gravity references (m/s²); weight = 70 kg × g, rounded to one decimal.
Where this actually matters
🧑🚀 Astronaut training & mission planning
NASA trains astronauts using neutral-buoyancy pools and reduced-gravity aircraft to approximate the Moon’s ~1.62 m/s² or Mars’ ~3.71 m/s² gravity, because muscle load, balance and mobility all depend directly on local g, not on the astronaut’s unchanging mass.
🛰️ Spacecraft & lander design
A lander’s legs, thrusters and parachutes must be engineered for the specific surface gravity of the landing site — the same lander mass produces very different touchdown forces and required deceleration on the Moon, Mars, or an asteroid.
🤸 Why astronauts can jump so high on the Moon
With the same leg-muscle force but only about 1/6th of Earth’s gravity pulling back, Apollo astronauts could jump far higher and carry heavier loads relative to their weight — their mass, and the force their muscles produce, never changed.
Common misconceptions
"You would weigh nothing in space because there is no gravity."
Astronauts in low Earth orbit are in freefall (microgravity), not zero gravity — Earth’s gravity at typical orbital altitude is still roughly 90% of its surface value. They feel weightless because they and their spacecraft are falling together, not because gravity has vanished.
"A bigger planet always has stronger surface gravity."
Surface gravity depends on both mass and radius, g = GM/r². Saturn is about 95 times Earth’s mass yet has a surface gravity of only about 10.44 m/s² (barely above Earth’s), because its huge, low-density bulk spreads that mass over a much larger radius.
"Weight and mass are the same thing, just different units."
Mass (kg) measures how much matter something contains and never changes with location. Weight (newtons) is the force gravity exerts on that mass, W = mg, and changes with every different g — the same mass, ten different weights across the solar system.
"On Pluto you would basically float away."
Pluto’s gravity (about 0.62 m/s²) is weak but not zero — a 70 kg person would still weigh about 43 N there, roughly the weight of a bag of sugar on Earth, enough to keep both feet on the ground, just very light.
Formula sources & further reading
The formulas here are standard, traceable to:
- • OpenStax, University Physics Volume 1 — §13.2, Gravitation Near Earth’s Surface (free, peer-reviewed). openstax.org
- • NASA, Planetary Fact Sheets — surface gravity values for all planets and notable bodies. nssdc.gsfc.nasa.gov
- • Halliday, Resnick & Walker, Fundamentals of Physics — Chapter 13, Gravitation.
Surface gravity g values are standard reference figures (m/s²), rounded to two or three decimals. Weight W = m × g; results are rounded for display.
How to use this calculator
Enter your mass
Type a value in kilograms (or switch units to pounds).
Scan the table
Weight on all ten bodies updates together from the single mass input.
Try one body in detail
Pick a planet and solve W, m or g given the other two values.
Related tools
Frequently asked questions
Why does my weight change on other planets but my mass does not?
Mass is the amount of matter you contain — it stays the same everywhere. Weight is the force gravity exerts on that mass, W = mg. Because each planet has its own surface gravity g, the same mass produces a different weight (force) on each one, even though nothing about you has changed.
What determines a planet’s surface gravity?
Surface gravity comes from g = GM/r², so it depends on both the planet’s mass M and its radius r. A more massive planet pulls harder, but if that mass is spread over a larger radius, the surface gravity is weaker — it is the ratio of mass to the square of radius that matters, not mass alone.
Why is Jupiter’s surface gravity so much higher despite being a gas giant?
Jupiter’s mass is enormous — about 318 times Earth’s — and even though its radius is roughly 11 times Earth’s, mass in the g = GM/r² formula wins out. The huge M in the numerator outweighs the r² in the denominator, giving Jupiter a surface gravity of about 24.79 m/s², roughly 2.5 times Earth’s.
Would I weigh less on the Moon or on Mars?
The Moon. The Moon’s surface gravity is about 1.62 m/s², versus about 3.71 m/s² on Mars — so you would weigh roughly 16.5% of your Earth weight on the Moon but about 38% of it on Mars. Mars pulls noticeably harder than the Moon despite both being much weaker than Earth.
Does altitude change my weight on a planet?
Yes — the standard g values used here are surface values (at roughly mean radius). Because g falls off as 1/r², going higher (a mountaintop, an aircraft, orbit) reduces g slightly, and going up enough (like reaching orbital altitude) can reduce your effective weight dramatically, even though your mass is unchanged.