Donaldson R F Planet Weight Calculator
Enter your weight on Earth to see what it would be on the Moon, Mars, Jupiter and every other planet — worked out from each one's own surface gravity.
How this is worked out
Your weight is your mass multiplied by the local surface gravity. This tool keeps your mass the same everywhere (mass does not change just by travelling) and multiplies your Earth weight by the ratio of each body's surface gravity to Earth's (9.8 m/s²). So on a world with half of Earth's gravity, you would weigh half as much.
The Moon's famous "one sixth of Earth gravity" is a rounding of the real ratio (1.6 ÷ 9.8 ≈ 0.163, or about one sixth); this tool uses the full figures rather than the rounded fraction. Stone (14 lb) is included since it is the everyday unit for body weight in the UK.
Frequently asked questions
Why is there no figure for standing on Jupiter or Saturn?
The gas giants have no solid surface to stand on; the "surface gravity" used for them is measured at the visible cloud tops, which is the usual convention, and is shown here on that basis only.
Does the Sun count?
Not here — this compares the Sun's planets, Pluto and the Moon only. The Sun's own surface gravity (about 274 m/s², roughly 28 times Earth's) is a different kind of figure, since nothing has a solid surface there either.
Related tools: Planet Facts Table, Age on Other Planets, Light Travel Time Calculator.
Source / Last verified: surface gravity figures from NASA/GSFC, "Planetary Fact Sheet – Metric" (nssdc.gsfc.nasa.gov/planetary/factsheet), marked "Last Updated: 18 March 2025, DRW"; copied and checked on 27 September 2026. Weight = mass × gravity is standard Newtonian mechanics.