Calculate your weight on the Moon from your Earth weight in pounds, kg or stone, or convert a Moon weight back to Earth weight, using lunar gravity.
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Moon Weight Formula
The formula to convert Earth weight to Moon weight is:
MW and EW are Moon and Earth force-scale equivalents in the same unit. The calculator uses nominal lunar gravity 1.622 m/s² and standard Earth gravity 9.80665 m/s², a ratio of approximately 0.165398. A kg-labelled result is the reading of an Earth-calibrated force scale, not a change in mass. Weight force in newtons equals unchanged mass in kilograms multiplied by local gravitational acceleration.
Earth to Moon Weight Reference Table
The table below gives approximate Earth-calibrated force-scale readings. The kg columns show scale equivalents, not a reduction in mass.
| Earth Weight (lbs) | Moon Weight (lbs) | Earth Weight (kg) | Moon Scale Equivalent (kg) |
|---|---|---|---|
| 100 | 16.5 | 45.4 | 7.5 |
| 120 | 19.8 | 54.4 | 9.0 |
| 140 | 23.2 | 63.5 | 10.5 |
| 160 | 26.5 | 72.6 | 12.0 |
| 180 | 29.8 | 81.6 | 13.5 |
| 200 | 33.1 | 90.7 | 15.0 |
| 220 | 36.4 | 99.8 | 16.5 |
| 250 | 41.3 | 113.4 | 18.7 |
| 300 | 49.6 | 136.1 | 22.5 |
Why You Weigh Less on the Moon
Weight is the force of gravity acting on mass. It depends on two properties of the celestial body you are standing on: its total mass and its radius. The Moon’s mass is 7.346 × 10²² kg, only 1.23% of Earth’s 5.972 × 10²⁴ kg. Its mean radius is 1,737.4 km, about 27.3% of Earth’s 6,371 km. Plugging these into Newton’s law of universal gravitation (F = GMm/r²) produces a surface gravitational acceleration of 1.622 m/s², compared to Earth’s 9.81 m/s². That 6:1 ratio is why a 180 lb person feels only about 30 lbs of force on the lunar surface.
Importantly, your mass never changes between Earth and the Moon. A 70 kg person has 70 kg of mass everywhere in the universe. What changes is the gravitational force pulling on that mass, and therefore the number a scale reads.
Lunar Gravity Is Not Uniform
Lunar gravity varies with terrain and the distribution of mass beneath the surface. NASA’s GRAIL mission mapped these variations, including mass concentrations called mascons that produce locally stronger gravitational attraction. This calculator uses a nominal lunar value rather than a site-specific gravity model.
What Apollo Astronauts Actually Carried
The A7L and A7LB spacesuits used during lunar EVAs weighed approximately 82 kg (180 lbs) on Earth, including the Portable Life Support System (PLSS) backpack. On the Moon, that suit weighed roughly 13.5 kg (30 lbs). Combined with an astronaut’s body weight, a typical moonwalker carried an Earth-equivalent total of about 250 kg (550 lbs), reduced to approximately 41 kg (91 lbs) under lunar gravity. Despite weighing only a sixth of their Earth total, the mass remained the same, meaning astronauts still had to overcome significant inertia when changing direction. This led to the characteristic “loping” gait seen in Apollo footage, where astronauts bounced forward in long, low strides rather than walking heel-to-toe. The high center of mass from the backpack also caused frequent stumbles, and several astronauts reported difficulty stopping quickly or turning sharply.
Weight of Common Objects on the Moon
| Object | Earth Weight | Moon Weight |
|---|---|---|
| Gallon of water | 8.34 lbs (3.78 kg) | 1.38 lbs (0.63 kg) |
| Bowling ball (regulation) | 16 lbs (7.26 kg) | 2.65 lbs (1.20 kg) |
| Apollo Lunar Module (ascent stage) | 10,334 lbs (4,688 kg) | 1,710 lbs (776 kg) |
| Lunar Roving Vehicle | 463 lbs (210 kg) | 76.6 lbs (34.7 kg) |
| Average car (sedan) | 3,500 lbs (1,588 kg) | 579 lbs (263 kg) |
| Grand piano | 990 lbs (449 kg) | 164 lbs (74.3 kg) |
Moon vs Other Solar System Bodies
The table below gives approximate scale-equivalent readings for a 150 lb Earth reading, using standard Earth gravity 9.80665 m/s². Values for bodies without a solid surface refer to a nominal atmospheric reference level.
| Body | Surface Gravity (m/s²) | % of Earth Gravity | 150 lbs on Earth Becomes |
|---|---|---|---|
| Sun | 274.0 | 2,793% | 4,191 lbs |
| Jupiter | 24.79 | 253% | 379 lbs |
| Neptune | 11.15 | 114% | 171 lbs |
| Saturn | 10.44 | 106% | 160 lbs |
| Earth | 9.81 | 100% | 150 lbs |
| Venus | 8.87 | 90% | 136 lbs |
| Uranus | 8.69 | 89% | 133 lbs |
| Mars | 3.71 | 38% | 57 lbs |
| Mercury | 3.70 | 38% | 57 lbs |
| Moon | 1.622 | 16.5% | 24.8 lbs |
| Pluto | 0.62 | 6.3% | 9.5 lbs |
FAQ
The Moon’s surface gravitational acceleration is 1.622 m/s², about 16.5% of Earth’s 9.81 m/s². In everyday terms, you would weigh roughly one-sixth of your Earth weight on the Moon. A 180 lb person would weigh about 29.8 lbs.
Mass is the amount of matter in an object, measured in kilograms. It does not change regardless of location. Weight is the force of gravity acting on that mass, measured in newtons (or commonly in pounds/kg-force). Your mass is identical on Earth and the Moon, but your weight on the Moon is only 16.5% of your Earth weight because the Moon’s gravitational pull is weaker.
For the same upward takeoff speed, an ideal jump would rise about six times higher on the Moon, ignoring air resistance. The same muscular force does not guarantee the same takeoff speed. This ideal comparison does not predict a particular person’s or astronaut’s jump height.
Lunar gravity varies with terrain and the distribution of mass beneath the surface. NASA’s GRAIL mission mapped these variations, including mass concentrations called mascons that produce locally stronger gravitational attraction. This calculator uses a nominal lunar value rather than a site-specific gravity model.
A person standing on the lunar surface has nonzero gravitational weight. In free fall, a scale falling with you can read nearly zero even though gravity still acts. Lagrange points are orbital equilibrium locations, not places where gravity simply disappears.
