To estimate your weight on the Moon, multiply your Earth weight by about 0.165. A person who weighs 150 pounds-force on Earth would weigh approximately 24.8 pounds-force on the Moon. The person’s mass would not change—only the gravitational force pulling on it.
The Earth-to-Moon weight formula
Moon weight = Earth weight × 0.165. This works when you use the same weight units on both sides, such as pounds-force or newtons, and assumes typical surface gravity rather than local variations. The NASA Glenn Research Center gives lunar surface acceleration as about 1.62 meters per second squared, which is roughly 0.165 of Earth’s.
For a rough mental shortcut, divide your Earth weight by six. That gives a slightly different rounded answer from 0.165, but it’s close enough for an everyday explanation.
Examples: what different Earth weights become on the Moon
These figures are calculated estimates of weight, not readings from an ordinary bathroom scale carried to the Moon.
| Earth weight | Moon weight (approx.) |
|---|---|
| 50 lb | 8.3 lb-force |
| 100 lb | 16.5 lb-force |
| 150 lb | 24.8 lb-force |
| 200 lb | 33.0 lb-force |
| 250 lb | 41.3 lb-force |
Why does your mass stay the same?
Mass describes how much matter an object contains and how it resists changes in motion. Weight is the force caused by gravity acting on that mass. Earth’s pull is stronger than the Moon’s, so the weight is different. A 70-kilogram person remains 70 kilograms in mass on the Moon, even though the gravitational force on that mass is smaller.
In physics, weight is measured in newtons. For instance, a 70 kg mass experiences roughly 70 × 9.8 ≈ 686 newtons of gravitational force near Earth’s surface, versus 70 × 1.62 ≈ 113 newtons near the Moon’s surface. In everyday U.S. conversation, ‘weigh 150 pounds’ refers to a pound-force weight supported by Earth gravity.
Would it be easy to pick up heavy objects on the Moon?
An object weighs less on the Moon, making it easier to support against gravity. However, it keeps the same inertia, so starting, stopping and turning a bulky object can still be difficult. Astronauts also need cumbersome pressure suits and must cope with unfamiliar footing. Lower weight does not mean an object has become physically tiny or effortless to control.
Does gravity differ across the Moon?
Yes, slightly. The Moon’s gravity field is not perfectly uniform; underground mass concentrations and terrain affect local gravity. NASA’s Moon fact sheet reports average lunar surface gravity around 1.62 m/s². For a classroom calculator or quick comparison, the 0.165 factor is appropriate.
Why an Earth bathroom scale may mislead you
Many bathroom scales measure a force using sensors but display a number calibrated as though that force occurred in Earth’s gravity. On the Moon, that same scale would be pulled on differently; a specially calibrated instrument or correct unit interpretation would be needed to measure mass and lunar weight properly.
Frequently asked questions
How much would 100 pounds weigh on the Moon? About 16.5 pounds-force.
Would a 200-pound person weigh 33 pounds? Approximately 33 pounds-force, yes; their mass would still be the same.
Does a person’s body physically lose weight? No matter is lost merely by traveling to the Moon; the gravitational force on the body is lower.
How much weight would I have on Mars instead? Mars has greater surface gravity than the Moon, about 38% of Earth’s, so the same object would weigh more on Mars than on the Moon.
Explore gravity further
Read Why Would You Weigh Less on the Moon but Have the Same Mass? and Would a Bathroom Scale Work on the Moon?.
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