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m/s²
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Have you ever wondered how much you would weigh on Mars, Jupiter, or the Moon? Weight is not an intrinsic property of your body — it depends on the local gravitational acceleration. While your mass (measured in kilograms) stays the same everywhere in the universe, your weight (measured in Newtons or pounds) changes with the surface gravity of whichever world you are standing on:
$$W = m \times g$$
Each planet and moon has a different surface gravity $$g$$, determined by its mass and radius. On Mars, where $$g = 3.72 \, \text{m/s}^2$$, you would weigh only 38% of your Earth weight. On Jupiter, with $$g = 24.79 \, \text{m/s}^2$$, you would weigh 2.5 times more. Our calculator lets you select any planet in the solar system (plus the Moon) and instantly see your weight in Newtons and pounds.
This tool is popular for science education, space exploration discussions, and understanding the physical challenges astronauts would face on other worlds. The surface gravity values used are from NASA's Planetary Fact Sheets.
The calculator stores the surface gravitational acceleration for each body:
| Body | g (m/s²) | Relative to Earth |
|---|---|---|
| Mercury | 3.70 | 0.38 |
| Venus | 8.87 | 0.90 |
| Earth | 9.81 | 1.00 |
| Mars | 3.72 | 0.38 |
| Jupiter | 24.79 | 2.53 |
| Saturn | 10.44 | 1.06 |
| Uranus | 8.87 | 0.90 |
| Neptune | 11.15 | 1.14 |
| Moon | 1.62 | 0.17 |
Your weight is computed as $$W = m \times g_{\text{planet}}$$, then converted to pounds using the factor 1 N = 0.2248 lbs.
A ratio less than 1.0 means you weigh less than on Earth — you could jump higher and carry heavier loads. A ratio greater than 1.0 means heavier — walking would be more strenuous, and cardiovascular strain would increase. On Jupiter (ratio 2.53), a 70 kg person would feel as heavy as a 177 kg person feels on Earth. On the Moon (ratio 0.17), that same person would feel like they weigh only 11.9 kg on Earth — enabling the famous bounding leaps of Apollo astronauts.
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A 70 kg person weighs only 260 N (59 lbs) on Mars — about 38% of their Earth weight. This has implications for bone density loss during long-duration Mars missions.
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On Jupiter, the same person would weigh 1,735 N (390 lbs) — 2.53 times their Earth weight. Standing upright would be extremely difficult, and sustained exposure would cause serious health effects.
Mass is the amount of matter in an object (measured in kg) and does not change with location. Weight is the gravitational force acting on that mass (measured in N or lbs) and varies depending on local gravity. You have the same mass on Earth and Mars, but different weight.
It is a coincidence of their mass-to-radius ratios. Venus has 81.5% of Earth's mass but 95% of its radius, while Uranus has 14.5 times Earth's mass but 4.0 times the radius. Since $$g = GM/R^2$$, both combinations yield approximately 8.87 m/s².
Jupiter has no solid surface — it is a gas giant. The 'surface' gravity value refers to the cloud-top level at 1 bar pressure. Even if there were a surface, the 2.53g gravity would make prolonged human habitation extremely difficult and dangerous.
Extended exposure to low gravity causes bone density loss (1-2% per month), muscle atrophy, cardiovascular deconditioning, fluid redistribution toward the head, and vision changes. ISS astronauts exercise 2+ hours daily to mitigate these effects in microgravity.
The Moon has only 1.2% of Earth's mass and 27.3% of Earth's radius. Since $$g = GM/R^2$$, the small mass dominates, giving the Moon only 16.5% of Earth's surface gravity (1.62 m/s²).
If you can jump 0.5 m high on Earth, you could jump approximately $$0.5 \times (9.81/1.62) \approx 3.0$$ meters on the Moon. The Moon's gravity is about 1/6 of Earth's, so you can jump roughly 6 times higher.
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