Free Weight on Other Planets Calculator

Imagine a future where traveling around the solar system is as normal as flying to another country today. While your luggage stays the same, your body weight will be drastically different on each world you visit. With a planetary weight calculator — often called a “weight on other planets calculator” — you can instantaneously discover your weight across all major bodies in the solar system, including the dwarf planet Pluto. Just enter your Earth weight (in any unit), and the tool returns your weight on each planet, moon, or dwarf planet.

Mass vs. Weight: Why You Weigh Differently Elsewhere

It is important to first distinguish between mass and weight. Mass is a measure of the amount of matter in your body; it remains unchanged wherever you go in the universe. Weight, on the other hand, is the gravitational force acting on that mass. In open space far from any star or planet, your weight becomes zero, even though your mass stays exactly the same. This fundamental difference explains why a planetary weight calculator shows different numbers for different destinations.

The Physics That Powers the Calculator

The variation in weight arises from differences in gravitational force on each planet, which obey Newton’s law of universal gravitation:

$$F = \frac{G \, M \, m}{r^{2}}$$

• $F$ = gravitational force (weight),
• $G$ = universal gravitational constant,
• $M$ = mass of the planet,
• $m$ = your mass,
• $r$ = radius of the planet.

The acceleration due to gravity on a planet’s surface is

$$g_{\text{planet}} = \frac{G M}{r^{2}}.$$

Then your weight on that planet becomes:

$$W_{\text{planet}} = W_{\text{Earth}} \times \frac{g_{\text{planet}}}{g_{\text{Earth}}}.$$

For instance, a person with an Earth weight of 75 kg would weigh only about 28.5 kg on Mars because

$$75 \times \frac{3.73}{9.81} \approx 28.5\ \text{kg}.$$

Handy Reference: Surface Gravity Across the Solar System

The following table lists the surface gravity of every planet (and Pluto) expressed both as a multiple of Earth’s gravity and in m/s². The tool uses these values to perform the conversions.

Celestial Body	Gravity (Earth = 1)	Surface Gravity (m/s²)
Mercury	0.38	3.70
Venus	0.91	8.87
Earth	1.00	9.81
Mars	0.38	3.73
Jupiter	2.34	22.96
Saturn	0.93	10.44
Uranus	0.89	8.69
Neptune	1.12	11.15
Pluto	0.06	0.62

Whether you need a weight on Mars calculator or a weight on Jupiter calculator, the planetary weight calculator handles all these values automatically.

Notable Scenarios: Jupiter and Earth’s Own Gravity Changes

Jupiter’s gravity is the strongest in the solar system after the Sun; its mass is about 320 times that of Earth. However, Jupiter has no solid ground. Scientists define the gravity at the top of its cloud layer, where $g \approx 22.96\ \text{m/s}^{2}$ (2.34 g). Standing (theoretically) at that height, you would weigh more than twice your Earth weight.

Your weight also changes slightly depending on your position on Earth. At the poles you weigh about 1 % more than at the equator. This is due to two combined factors: Earth’s polar radius is slightly smaller than its equatorial radius, and the centrifugal force from rotation is maximal at the equator, acting opposite to gravity.

How to Use This Gravity on Other Planets Tool

This free planetary weight calculator is designed for quick and accurate results. Simply input your Earth weight in any unit (e.g., kg, lb, stone) and the tool instantly displays your weight on each solar system body. You can immediately see your weight on Mars, Jupiter, Saturn, and beyond. The calculator also includes Pluto, so you can satisfy your curiosity about that distant dwarf planet.

Now that you understand the science behind the numbers, you can use the planetary weight calculator with full confidence.