We calculate weight by multiplying mass by the gravity on the surface of the planet.

Weight = Mass x Surface Gravity

So, if you know your weight on Earth and the surface gravity on Earth, you can calculate your mass. You can then calculate your weight on any other planet by using the surface gravity of that planet in the same equation.

You can work it out for yourself using the surface gravity values in the following planetary data sheet. You can then check your answers using the weight calculator.

Planet Data Sheet

Facts and Figures	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune
a 1 AU (or Astronomical Unit) = 149,600,000 km and is the mean distance from the Earth to the Sun b 1 Earth Mass = 5,980,000,000,000,000,000,000,000 kg c 1 g = 9.8 m/s2
Orbital Distance (AU)a	0.38	0.72	1.0	1.52	5.2	9.45	19.2	30.06
Radius (KM)	2,440	6,052	6,378	3,397	71,492	60,268	25,559	24,746
Mass (Earth Masses)b	0.055	0.82	1.0	0.11	318	95.2	14.5	17.1
Year Length (Earth Days)	88	225	365.25	687	11.9 Years	29.45 Years	84.0 Years	164.8 Years
Day Length (Earth Days)	176	117	1.0	1.03	0.41	0.43	0.75	0.67
Surface Gravity (g)c	0.38	0.91	1.0	0.38	2.34	0.93	0.92	1.12
Surface Temperature	-200 to 400 °C	460 °C	-80 to 50 °C	-150 to 20 °C	-110 °C	-140 °C	-190 °C	-200 °C
Number of moons	0	0	1	2	63	60	27	13