Free Weight Calculator Online
Use this free weight calculator to discover how much you would weigh on other planets, the Moon, and the Sun. Enter your Earth weight and the weight calculator instantly computes your weight across the entire solar system using accurate surface gravity ratios.
Planetary Weight
Enter your Earth weight
How the Weight Calculator Works
The weight calculator multiplies your Earth weight by the surface gravity ratio of each planet relative to Earth. Earth has a surface gravity of 9.81 m/s². Mars has 3.72 m/s², giving a ratio of 0.38. So a 150 lb person weighs 150 x 0.38 = 57 lbs on Mars.
Jupiter, the most massive planet, has a surface gravity of 24.79 m/s² (2.53x Earth). That same 150 lb person would weigh 379 lbs on Jupiter — more than double their Earth weight. The weight calculator shows all these comparisons in a clear table.
The weight calculator also includes the Moon (0.166x Earth) and the Sun (27.9x Earth) for reference. These gravity differences explain why astronaut suits can be lighter on the Moon and why no spacecraft could survive landing on Jupiter or the Sun.
Surface Gravity Ratios
The weight calculator uses these ratios to compute your weight everywhere.
Fun Gravity Facts
Moon Jumping
On the Moon, you could jump 6x higher than on Earth. A typical 18-inch vertical jump becomes 9 feet. The weight calculator shows why — at 1/6 gravity, everything feels 6x lighter.
Mars Colony
At 0.38g, a 180 lb person weighs only 68 lbs on Mars. Long-term Mars residents would experience muscle and bone loss similar to astronauts on the ISS. The weight calculator illustrates this challenge.
Jupiter Crush
At 2.53g, walking on Jupiter (if it had a surface) would feel like carrying another person on your back. A 150 lb person would struggle under 379 lbs of weight according to the weight calculator.
Frequently Asked Questions
Disclaimer: This weight calculator uses standard surface gravity ratios. Gas giants like Jupiter and Saturn have no solid surface. Values are approximate and for educational purposes only.
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