Weight on Other Planets Calculator

Your mass does not change when you travel from Earth to another world, but your weight does. Mass describes the amount of matter in your body and is conventionally measured in kilograms. Weight is a force caused by gravity and, in strict SI usage, is measured in newtons. Everyday bathroom scales divide the measured force by standard Earth gravity and display a kilogram-equivalent reading, which is why people commonly describe the number as their weight in kilograms. This calculator follows that familiar convention. It multiplies an Earth scale reading by the selected world's approximate surface-gravity ratio. If an Earth scale shows 70 kilograms, Mars at about 0.38 Earth gravity would produce an equivalent reading near 26.6 kilograms. The person's mass is still 70 kilograms; only the downward gravitational force and corresponding scale response have changed. On Jupiter the same calculation gives a much larger value because its reference gravity is over twice Earth's. The listed ratios are rounded representative values. Gravity is not perfectly uniform across any world. It changes slightly with latitude, altitude, local geology, rotation, and the reference radius used. Gas giants do not have a solid surface where someone could stand, so their values refer to a conventional atmospheric level, often near one bar of pressure. The Moon is included because it is a familiar destination even though it is not a planet. Pluto is omitted from the main planet list because it is classified as a dwarf planet. Weight influences how high a person can jump, how hard objects press on a support, and how much force is needed to lift them. Inertia depends on mass, however, so a massive object remains difficult to start, stop, or turn even in weak gravity. Spacesuits, life support, terrain, and limited traction also mean that movement on another world is more complicated than the scale ratio alone suggests. Use this tool for education, science communication, fictional-world comparisons, and quick intuition about planetary gravity. It is not a mission-planning model and does not account for orbital free fall, spacecraft acceleration, atmospheric buoyancy, or changing gravity with height. The calculation is intentionally transparent: equivalent reading equals Earth reading multiplied by local surface gravity divided by Earth's surface gravity.