Planet Weight Calculator — Mass and Gravitational Force

Compare the gravitational force on the same mass across the eight planets. Enter kilograms or pounds of mass, then choose a planet for the main result. The comparison table uses NASA JPL’s published equatorial gravity values, while the mass itself stays unchanged.

How to use this tool

1. Enter the mass and select kilograms or pounds.
2. Select a planet and inspect the gravity displayed beside the result.
3. Read newtons for SI force, and kgf or lbf for conventional force equivalents.
4. Use the reference table to check how force scales with mass.

Formula

F = m × g; force in kgf = F ÷ 9.80665; force in lbf = F ÷ 4.4482216152605

F is force in newtons, m is mass in kilograms, and g is acceleration in m/s². One avoirdupois pound of mass is exactly 0.45359237 kg. No rounded Earth-weight multiplier is used.

Example

A 70 kg mass at the Mars reference gravity of 3.71 m/s² has a gravitational force of 259.7 N. At the Jupiter reference of 24.79 m/s², the same mass has a force of 1,735.3 N. These are changes in force, not changes in kilograms of matter.

Reference model

The Earth row uses JPL’s 9.80 m/s² equatorial reference. The force-unit conversions use the separate conventional standard value 9.80665 m/s². Giant-planet entries are reference levels, since those planets do not provide solid surfaces on which a person could stand.