Planets - Calculate Gravity

Calculator for the gravity of Sun, Moon, Earth and the planets, in g, m/s², ft/s² and compared to each other. The gravity, gravitation or gravity acceleration tells, how strongly objects at the surface of celectial bodies are attracted and how fast they accelerate when falling down. It depends above all on the mass of the celectial body and on the distance from its center. The value at the poles is higher than at the equator, but that difference is low. One reason for this is also the centrifugal acceleration, which increases from the poles toward the equator. Average values ​​are used here.

g:
m/s²:
ft/s²:
Gravity		g m/s² ft/s²
Moon:
Mercury:
Venus:
Earth:
Mars:
Jupiter:
Saturn:
Uranus:
Neptune:
Pluto:
Sun:

Round to   0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15   decimal places.

Please enter one value, the other values will be calculated.
g has the value of 9.80665 m/s², which is the average gravity acceleration on Earth.

Example: on the surface of Earth, the gravity is almost as high as on Saturn, whereas the Sun has 28 times the gravity of Earth.

Gravity determines the weight of masses. It is sometimes heard that a person weighs only one-sixth as much on the Moon as on Earth. This is roughly correct. However, examples stating something like a 60-kilogram person weighs only 10 kilograms there are physically incorrect. The kilogram is a unit of mass, and mass does not change due to gravity. Weight is a force measured in newtons [see kilogram-to-newton conversion]. The physically correct figures are as follows. A person with a mass of 60 kilograms weighs approximately 589 newtons on Earth, whereas on the Moon weighs 97 newtons. A mass that experiences a gravitational force of 97 newtons on Earth is 10 kilograms.

A strong gravitational force holds massive objects more firmly against a planet's surface, making it harder to move away from it, such as by jumping or flying. This applies to solid surfaces. In the case of gas planets, gravity acts as an acceleration pulling objects toward the planet's center, while atmospheric friction opposes this force.

Last updated on 08/03/2026. Author: Jürgen Kummer

Calculators for Planets and Astronomy

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