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See how much you would weigh on Moon, Mars, Jupiter and every planet. Free astronomy tool.
A: The Moon's gravity is much weaker than Earth's, about 1.62 m/s^2 compared with 9.8 m/s^2. That is why your measured weight is much lower there.
A: Mars has a gravity of about 3.72 m/s^2, which is around 0.38 of Earth's gravity. A 70 kg Earth reference becomes about 26.5 kg in this calculator's weight comparison.
A: Mass stays the same everywhere and is measured in kilograms. Weight is the force caused by gravity, so it changes from one planet to another.