Weight on Other Planets

Weight on planets: P = m·g

Weight is the gravitational force a body experiences: P = m·g, where m is mass (kg) and g is the local gravitational acceleration (m/s²). Each celestial body has its own g, computed from Newton's law as g = G·M/R². Reference values (m/s²): Mercury 3.7, Venus 8.87, Earth 9.81, Mars 3.71, Jupiter 24.79, Saturn 10.44, Uranus 8.69, Neptune 11.15, Moon 1.62, Sun 274. A 70 kg person weighs about 686 N on Earth, ~257 N on Mars, ~113 N on the Moon, and ~1736 N on Jupiter — more than 2.5× Earth weight. Mass does not change with location; only weight does, because weight depends on the local gravitational field.

Applications

Space mission planning (Landsat, Artemis, Mars Sample Return — engineers size landing gear and rockets to local g), astronaut training, secondary-school physics (BNCC, Brazilian high-school curriculum), science-fiction worldbuilding (Andy Weir's "The Martian" reasons about 0.38·g effects on humans), and historical analysis of Apollo Moon walks where reduced gravity made bunny-hops more efficient than walking.

FAQ

Why is Jupiter's gravity not crushing despite its size? Jupiter is huge in mass, but its radius is also large, and g falls with R². The cited 24.79 m/s² is the value at the cloud tops — there is no solid surface to "stand" on.

Would I be lighter on the Moon or on Mars? On the Moon — Moon g (1.62) is less than half of Mars g (3.71), so a 70 kg person feels ~11.6 kgf on the Moon vs. ~26.5 kgf on Mars.

What's the difference between mass and weight? Mass is a measure of inertia (constant everywhere); weight is the force from local gravity (changes with planet, altitude, even centrifugal effects at the equator).