Weight on Mars Calculator — kg, N and lbf

Calculate the gravitational force on a mass using the Mars equatorial reference acceleration. This is useful for comparing the same object on Earth and Mars without confusing kilograms with newtons. Metric mass is the default, and pounds of mass are also supported.

How to use this tool

1. Enter the mass and select kilograms or pounds.
2. Keep the displayed gravity reference in mind when comparing another source.
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

For a 70 kg mass, multiply 70 by the adopted Mars value 3.71 m/s². The result is 259.7 N. Dividing that force by 9.80665 gives approximately 26.482 kgf, while the object’s actual mass remains 70 kg.

Reference model

This page uses NASA JPL’s equatorial gravity table, not the distinct mean-gravity or rotation-adjusted acceleration entries in some Mars fact sheets. A real instrument at a particular location would also depend on elevation, latitude and its calibration. A spacecraft in free fall can have negligible apparent weight while gravity still acts.