Planetary Weight Calculator

Physics & Astronomy Tools

Ever wonder what you would weigh on Mars or Jupiter? Use this calculator to find your weight on other planets and celestial bodies based on Newton’s law of universal gravitation.

Your Weight Across the Solar System

Celestial Body	Surface Gravity (m/s²)	Your Weight (lbs)	Your Weight (Newtons)

What is a Planetary Weight Calculator?

A planetary weight calculator is a tool used to determine your weight on different planets in our solar system. It works by applying the principles of Newton’s law of universal gravitation. While your mass—the amount of matter in your body—remains constant everywhere in the universe, your weight can change dramatically depending on the gravitational pull of the celestial body you are on. This calculator helps to illustrate how gravity varies from planet to planet and what effect that has on the force you would exert, which is what we measure as weight.

The Formula to Calculate Weight on Other Planets

The calculation of weight is based on a simple yet profound formula in physics: Weight = mass × gravity (W = mg). This formula is a specific application of Newton’s Second Law of Motion (F=ma). To calculate weight on another planet, we need to know your mass and the surface gravity of that planet.

• Mass (m): This is constant. We first calculate your mass from your Earth weight. Since weight on Earth is `W_earth = m * g_earth`, your mass is `m = W_earth / g_earth`.
• Gravitational Acceleration (g): This value is unique for each planet, determined by its own mass and radius.

The final weight on another planet is then `W_planet = m * g_planet`.

Formula Variables Explained

Variable	Meaning	Unit (SI)	Typical Range
W	Weight	Newtons (N)	Varies based on location
m	Mass	Kilograms (kg)	Constant for an object
g	Gravitational Acceleration	meters per second squared (m/s²)	~0.62 (Pluto) to ~24.8 (Jupiter)

Practical Examples

Example 1: A Person on Mars

Let’s see how we can calculate the weight of a person on other planets. Imagine a person who weighs 165 lbs on Earth. The surface gravity on Mars is approximately 3.711 m/s².

1. Input Weight: 165 lbs on Earth.
2. Calculate Mass: First, we convert lbs to a mass in kg. 165 lbs is roughly 75 kg.
3. Calculate Weight on Mars: The ratio of Mars’ gravity to Earth’s gravity (9.81 m/s²) is about 0.38. So, the person’s weight on Mars would be 165 lbs * 0.38 = 62.7 lbs.

Example 2: A Car on Jupiter

Now consider a car weighing 1,500 kg on Earth. Jupiter has a powerful surface gravity of about 24.79 m/s².

1. Input Mass: 1,500 kg.
2. Calculate Weight on Jupiter: Jupiter’s gravity is about 2.53 times that of Earth. So, the car’s weight on Jupiter would be 1,500 kg * 2.53 = 3,795 kg (or expressed as force, 37,220 Newtons).

For more detailed calculations, check out our Integral Calculator.

How to Use This Planetary Weight Calculator

1. Enter Your Earth Weight: Start by typing your current weight into the “Your Weight on Earth” field.
2. Select the Unit: Use the dropdown menu to specify whether the weight you entered is in Pounds (lbs) or Kilograms (kg).
3. Choose a Celestial Body: Select a planet or moon from the list.
4. Calculate: Click the “Calculate Weight” button. The tool will instantly show your weight on the selected body, along with your mass and the local gravitational force. The full table and chart will also update.
5. Interpret the Results: The primary result shows your weight in your chosen unit. You can also see your true scientific weight in Newtons and analyze the full table and chart to compare weights across the solar system.

Key Factors That Affect Planetary Weight

Your weight on a planet is determined by its surface gravity, which is influenced by several key factors:

Planet’s Mass

The more massive a planet, the stronger its gravitational pull. Jupiter, being the most massive planet, has the highest gravity in our solar system.

Planet’s Radius (Size)

Gravity also depends on your distance from the planet’s center of mass. For a given mass, a smaller, denser planet will have a higher surface gravity because you are closer to its center.

Planet’s Density

Density (mass divided by volume) combines the two factors above. A planet made of dense rock will have a stronger gravity than a gas giant of the same size.

Your Mass

While your mass doesn’t change, a more massive object will experience a greater gravitational force (i.e., it will weigh more) than a less massive object.

Altitude

As you move away from a planet’s surface (e.g., up a mountain or into orbit), the gravitational pull weakens, and your weight decreases slightly. This calculator assumes you are at the surface.

Planetary Rotation

A planet’s spin creates a centrifugal force that slightly counteracts gravity, especially at the equator. This effect is generally very small but technically reduces your weight.

You can find more educational tools at our Web 2.0 scientific calculator.

Frequently Asked Questions (FAQ)

Is weight the same as mass?

No. Mass is the amount of matter in an object and is constant. Weight is the force of gravity acting on that mass and changes depending on your location.

Why is my weight different on other planets?

Because each planet has a different mass and size, resulting in a unique surface gravity. A stronger gravity pulls on your mass more, increasing your weight.

Which planet gives you the highest weight?

Jupiter. Its immense mass creates a gravitational pull about 2.5 times stronger than Earth’s.

Which planet gives you the lowest weight?

Of the main planets, Mercury would make you feel lightest. However, if we include dwarf planets, Pluto’s gravity is far weaker, where you would weigh only about 7% of your Earth weight.

What units does this planetary weight calculator use?

The calculator can accept your Earth weight in pounds (lbs) or kilograms (kg) and provides results in the same unit, as well as the standard scientific unit of force, the Newton (N).

How is gravitational force calculated?

It is calculated using Newton’s Law of Universal Gravitation, F = G * (m1*m2)/r^2, which simplifies to W = m*g at the surface of a planet. Our Keyword Density Checker can help you with SEO.

Does the calculator account for being on a mountain?

No, this calculator uses the average surface gravity at sea level (or its equivalent). Your weight would be slightly less at higher altitudes, but the difference is negligible for most practical purposes.

Why use Newtons for weight?

In physics, weight is a force, and the Newton is the standard unit of force. While we talk about weight in lbs or kg in daily life, these are technically measures of mass being acted on by Earth’s specific gravity.