Calculadora de Peso em Outros Planetas
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
W = m·g
About this calculator
The Weight on Other Planets Calculator lets you discover how much you or an object would weigh on the surface of different planets in the Solar System. Weight is calculated by multiplying the mass (in kg) by the specific acceleration due to gravity of each planet. For example, on Earth gravity is about 9.8 m/s², while on Mars it is about 3.7 m/s². This means a 70 kg person would weigh about 686 N on Earth and only 259 N on Mars. The tool is useful for scientific curiosity, space mission planning, or educational activities.
The calculation is simple: enter your mass (in kilograms) and select the desired planet. The calculator uses average surface gravity values for each planet, based on NASA data. It is important to remember that weight is a force measured in newtons (N), while mass is constant everywhere. The tool also considers dwarf planets like Pluto, in addition to the eight main planets. Accuracy is suitable for educational and entertainment purposes, but does not replace more refined calculations that take into account local gravity variations.
Use this calculator in situations such as: teaching children about gravity, comparing conditions on different planets, or simply satisfying curiosity about what your weight would be on Jupiter or Venus. Cautions: gravity can vary with altitude and planetary composition; values are approximate. Additionally, the calculator does not consider factors such as planetary rotation or relativistic effects, which are negligible for this purpose. Always check units: mass in kg, weight in N. To convert to kgf, divide the result by 9.8.
The tool is ideal for students, teachers, and astronomy enthusiasts. It helps understand the difference between mass and weight, a fundamental concept in physics. By experimenting with different masses and planets, the user perceives how gravity influences weight. For example, on the Sun (if possible), a 70 kg person would weigh about 19,110 N, while on Pluto it would be only 42 N. This illustrates the huge variety of gravitational environments in the Solar System.
Frequently asked questions
How is weight calculated on other planets?
Weight is calculated by multiplying your mass (in kg) by the acceleration due to gravity of the chosen planet. The formula is W = m × g, where g is the local gravity.
Why does my weight change on different planets but my mass does not?
Mass is the amount of matter in your body and is constant. Weight is the gravitational force exerted by the planet on you, which depends on local gravity.
Which planets are available in the calculator?
The calculator includes Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto (dwarf planet).
Does the calculator consider the planet's rotation?
No, the calculator uses average surface gravity values, disregarding rotation effects. For most educational purposes, this is sufficient.
Can I use the calculator for very light or very heavy objects?
Yes, the formula is linear and works for any mass. However, for extremely massive objects, relativistic effects may arise, but they are negligible here.