What is the Planet Weight Calculator?
Calculate your weight on every planet, the Moon, Pluto, and the Sun with this free planet weight calculator. Enter your Earth weight in kg or pounds and instantly compare surface gravity across the solar system. Shows gravity ratios, step-by-step formulas, and a full comparison table. Runs entirely in your browser with no signup.
How to use the Planet Weight Calculator
- Enter your weight on Earth in kilograms or pounds.
- Choose kg or lb as the display unit.
- Click Calculate to see weight on Mercury, Venus, Mars, Jupiter, and all other bodies.
- Review the comparison table with surface gravity and Earth gravity ratios.
- Copy the full results including calculation steps.
Common use cases
- Finding your weight on Mars for a science project
- Comparing Jupiter vs Moon gravity for a classroom demo
- Converting 150 lb on Earth to kg and other planetary weights
Frequently asked questions
- How is weight on other planets calculated?
- Weight equals mass times surface gravity. Your mass stays the same, so weight on another body is your Earth weight multiplied by the ratio of that body's gravity to Earth's gravity (9.807 m/s²).
- Why is my weight different on Jupiter and the Moon?
- Jupiter has much stronger surface gravity (about 2.5× Earth), so you weigh more. The Moon's gravity is about 17% of Earth's, so you weigh much less there.
- Does this use mass or weight?
- You enter your everyday Earth weight. The calculator treats that as your mass in kg (standard for planet weight tools) and scales it by each body's gravity to show what you would weigh there.
- Which celestial bodies are included?
- Mercury, Venus, Earth, the Moon, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and the Sun, using NASA planetary fact sheet surface gravity values.
