Weight on Other Planets Calculator: Moon to Neptune

How the Weight on Other Planets Calculator works

Your mass does not change when you travel, but your weight does because surface gravity is different on each world. This calculator translates an Earth scale reading into equivalent readings on the Moon and planets. The core relationship used here is Equivalent scale reading = Earth reading × selected body surface-gravity ratio. If you are building a complete observing or imaging setup, use the Escape Velocity Calculator alongside this page rather than treating one number in isolation.

Worked example and interpretation

A 70 kg Earth scale reading corresponds to about 26.5 kg-equivalent on Mars and about 177 kg-equivalent on Jupiter’s reference level.

For broader physical context, the NASA Planetary Fact Sheet is a useful external reference.

When this calculator is useful

Use it for education, outreach and comparing surface gravity across Solar System bodies.

When the result involves angular size, field, observing conditions or a current target, continue with Solar System Live. For a different but related perspective, Planetary Events Calendar can connect the formula to an actual observing, telescope or Solar System context.

Diagrams

Assumptions, accuracy and practical limits

Jupiter, Saturn, Uranus and Neptune do not have solid surfaces like Earth. Their listed gravity values refer to standard atmospheric reference levels and should be interpreted as comparisons.

A second external cross-check is available from NASA Solar System. Not for operational or published work.

Reference table: a 70 kg person on other worlds

Mass is unchanged on every world; only weight changes. A 70 kg person weighs about 686 N on Earth, one sixth of that on the Moon, and more than twice that at Jupiter’s cloud tops.

Related SpaceTracker.live tools

Continue with Escape Velocity Calculator, Solar System Live and Planetary Events Calendar.

Common mistakes and gravity lookup

• Mixing weight and mass. Mass is the same everywhere; weight is the force of gravity on that mass.
• Thinking of a gas giant’s “surface”. The values refer to the level where pressure equals Earth’s sea-level pressure.
• Using kilograms for weight. A scale shows kilograms, but the real unit of weight is the newton.

More questions answered

Why is gravity on Saturn close to Earth’s despite its size?

Saturn is large but has low density, so the surface gravity at its cloud tops is similar to Earth’s.

Would I be able to jump higher on Mars?

About 2.6 times as high with the same effort, because the gravity is 38 per cent of Earth’s.

Worked scenarios: a 90 kg person and a 20 kg backpack

Equivalent reading = Earth reading × (surface gravity of the body ÷ 9.80665 m/s²).

• On the Moon (1.62 m/s²): the person reads 14.9 kg and the backpack 3.3 kg.
• On Mars (3.71 m/s²): 34.0 kg and 7.6 kg.
• On Venus (8.87 m/s²): 81.4 kg and 18.1 kg, close to Earth values.
• At the cloud tops of Jupiter (about 24.79 m/s²): 227.5 kg and 50.6 kg. Jupiter has no solid surface, so this is a reference value only.

Mass stays the same everywhere; only the scale reading changes. Compare with the Escape Velocity Calculator to see how gravity also sets how hard it is to leave each world.

Frequently asked questions

Why does weight change but mass not?

Mass is the amount of matter; weight is the gravitational force on it, which depends on the planet.

What is meant by Jupiter’s surface?

Jupiter has no solid surface, so values use the 1-bar pressure level as a reference.

Which planet has the strongest surface gravity?

In the Solar System, Jupiter at roughly 24.8 m/s², about 2.5 times Earth’s.