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Weight on Other Planets Calculator

Check how much you'd weigh on other planets in our Solar system

Your Weight on Earth

This calculator determines your weight on other bodies in the solar system. While your mass remains constant everywhere, your weight changes based on the local force of gravity. [1, 2]

  • Mass vs. Weight: Mass is the amount of "stuff" in an object. Weight is the force exerted on that mass by gravity (Weight = Mass × Gravity). [1, 3]
  • Surface Gravity: Each planet has a different mass and radius, resulting in a unique gravitational pull at its surface. [2, 4] A massive planet like Jupiter has very high gravity, while a small body like Pluto has very low gravity.

WeightPlanet = WeightEarth × gFactor

Enter your weight and click Calculate

About Weight on Other Planets Calculator

The Cosmic Scale: Your Definitive Guide to Weight Across the Solar System

Have you ever stared up at the night sky and wondered? What would it feel like to leap through the low gravity of the Moon, your single bound covering the length of a car? Or to feel the immense, crushing pull of Jupiter, a force that would make every step a monumental effort? The number on your bathroom scale is not a universal constant; it's a local measurement, a conversation solely between you and the planet Earth. Change the planet, and you change that number entirely.

Welcome to our Weight on Other Planets Calculator, your personal portal to the solar system. This tool is far more than a novelty. It's an interactive lesson in one of the most fundamental concepts in physics: the profound difference between **mass** and **weight**. This comprehensive guide will walk you through the science, from Newton's groundbreaking laws to the unique gravitational fingerprint of each world. Whether you're a student aiming to solidify your understanding of gravity, a teacher looking for an engaging classroom tool, or a space enthusiast with a curious mind, prepare to embark on a journey of cosmic perspective.

Mass vs. Weight: The Most Important Distinction in Physics

Before we can journey to other worlds, we must first understand the ground beneath our feet. In everyday language, we use the terms "mass" and "weight" interchangeably, but in physics, they are worlds apart. Grasping this difference is the single most important step to understanding the calculator's results.

Mass (The "Stuff")

Mass is the measure of how much matter—how many atoms and molecules—an object contains. It is an intrinsic, fundamental property of an object. Your mass is the same whether you are on Earth, on the Moon, or floating in the vacuum of deep space. It's a measure of your inertia, or your resistance to being accelerated. It is measured in kilograms (kg).

Weight (The "Pull")

Weight, on the other hand, is a force. Specifically, it is the force of gravity pulling on an object's mass. It is entirely dependent on your location in the universe. Since it's a force, its proper unit is the Newton (N), though we often express it in pounds (lbs) or even kilograms-force for convenience.

Your mass is constant. Your weight is variable.

How Our Calculator Works

Our calculator uses the fundamental relationship between mass, weight, and gravity. It's a simple, two-step process:

Step 1: Input Your Weight on Earth

Enter your weight as you know it. Our calculator first uses this number and Earth's known surface gravity to calculate your *mass*. This is the crucial intermediate step. It essentially answers the question: "Given this weight on Earth, how much 'stuff' is this person made of?"

Step 2: Select a Celestial Body

Choose any planet, dwarf planet, or moon from our list. Each celestial body has its own unique mass and radius, which results in a unique gravitational pull at its surface.

Step 3: See Your Cosmic Weight

The calculator then takes your constant mass and multiplies it by the surface gravity of the world you selected. The result is your weight on that world, displayed in the same unit you originally entered.

The Physics Engine: Gravity's Universal Law

The force of gravity is described by Sir Isaac Newton's Law of Universal Gravitation. This elegant equation, formulated in 1687, states that every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

F = G × (m₁m₂) / r²

  • F is the gravitational force (your weight).
  • G is the universal gravitational constant, a tiny number that scales the force.
  • m₁ is the mass of the first object (e.g., a planet).
  • m₂ is the mass of the second object (e.g., you).
  • r is the distance between the centers of the two objects (the planet's radius).

The key takeaways here are that a planet's gravitational pull gets stronger as its mass (m₁) increases, but it gets weaker very quickly as its radius (r) increases, due to the "square" in the denominator. This is why a massive but very large planet can have a surprisingly low surface gravity. For simplicity, physicists combine `G`, `m₁`, and `r²` for a given planet into a single value called **surface gravity (g)**. The formula then simplifies to the familiar:

Weight = Mass × g

Our calculator has the value of `g` for every major body in our solar system stored and ready to use.

A Gravitational Tour of the Solar System

Let's put on our space suits and see how your weight would change as we hop from world to world.

Mercury

The smallest planet is also very dense. Your weight here would be about 38% of your Earth weight. You'd feel light and nimble on this sun-scorched, airless world.

Venus

Often called Earth's "sister planet" due to its similar size and mass, the surface gravity is very close to ours. You'd weigh about 91% of your Earth weight. However, with crushing atmospheric pressure and lead-melting temperatures, you wouldn't be standing for long.

Earth's Moon

The classic example of low gravity. With only about 16.6% (or 1/6th) of Earth's pull, you could perform incredible leaps and bound across the dusty lunar surface, just like the Apollo astronauts.

Mars

The Red Planet has a surface gravity similar to Mercury's. You'd weigh just 38% of your Earth weight. This lower gravity is a serious consideration for the long-term health of future Martian colonists, as it could lead to muscle and bone density loss.

Jupiter

The king of planets. As a gas giant, it has no solid surface. But if you could stand at the cloud tops where the atmospheric pressure is the same as Earth's, you would feel a pull 2.5 times stronger than what you're used to. Every movement would be a struggle.

Saturn

Though immense in size, Saturn is the least dense planet in our solar system—it would float in water! This low density means its surface gravity is surprisingly close to Earth's, at about 106%. You'd weigh just a little more than you do at home.

Uranus

This tilted ice giant has a surface gravity slightly less than Earth's. You would weigh about 89% of your Earth weight, feeling a bit lighter as you float through its frigid, blue-green atmosphere.

Neptune

The most distant major planet is denser than Uranus. Its gravity is slightly stronger than Earth's, and you would weigh about 112% of your Earth weight.

Pluto

On this distant, icy dwarf planet, gravity is incredibly weak. You'd weigh a mere 7% of your Earth weight. A gentle push-off would send you soaring gracefully for a long, slow-motion arc.

Frequently Asked Questions (FAQ)

Q: Why do I feel "weightless" in space if gravity is everywhere?

This is an excellent question! Astronauts on the International Space Station are not weightless because there is no gravity. In fact, the gravity at that altitude is still about 90% as strong as it is on the surface. They feel weightless because they are in a constant state of **freefall**. The station and everything in it are perpetually falling towards Earth, but they are also moving sideways so fast that they constantly "miss" it. This state of continuous falling is what creates the sensation of weightlessness.

Q: How do scientists determine the mass of a planet?

They use Newton's laws in reverse! By observing a moon orbiting a planet, they can measure the moon's orbital period and distance. Using these values in Kepler's and Newton's formulas, they can precisely calculate the mass of the parent planet that must be providing the gravitational force to keep the moon in that orbit.

Q: What would my weight be on the Sun?

The Sun's gravity is immense. At its visible surface (the photosphere), the gravitational pull is about **28 times** stronger than Earth's. A 150-pound person would weigh over 4,200 pounds! You would be instantly crushed by your own weight, long before you were vaporized by the heat.

A Universe of Perspective

Understanding your weight on other planets does more than satisfy a simple curiosity. It fundamentally reframes your connection to the universe. It demonstrates that you are not just a number on a scale, but a collection of mass interacting with the grand gravitational field of a celestial body. It underscores the unique, life-sustaining conditions of our home planet, where the gravity is just right—strong enough to hold our atmosphere, but gentle enough for us to thrive.

We invite you to explore, to experiment, and to share this tool with others. Let it be a launchpad for your imagination and a solid ground for your understanding of physics. The next time you look at the stars, you'll know that each one represents a different scale, a different pull, a different way to weigh the matter that makes you, you.

Frequently Asked Questions

What is a Weight on Other Planets Calculator?
A weight on other planets calculator determines how much you would weigh on other planets or moons by accounting for differences in gravitational pull compared to Earth's gravity.[1][4][5]
How does the calculator work?
You enter your weight (or mass), and the calculator multiplies it by the ratio of the gravity on the selected planet to gravity on Earth. For example, if Mercury's gravity is about 38% that of Earth, your weight there is about 38% of your Earth weight.[3][4][6]
What is gravity’s role in determining weight on other planets?
Weight is the force exerted by gravity on your body. Since each planet has a different mass and size, surface gravity differs, changing how much you would weigh there compared to Earth.[2][3][5]
Why does my weight change from planet to planet?
Because each planet’s gravity is different, your weight (force) changes, but your mass (amount of matter) stays constant everywhere.[2][4][5]
What is the difference between mass and weight?
Mass is the total amount of matter in your body and doesn't change with location. Weight is the gravitational force on that mass, so it changes with the gravity of the object you are on.[4][5]
What units can I use in the calculator?
Most calculators accept weight in kilograms, pounds, or Newtons, and display output in the same units. Check instructions to see which units are supported.[1][4][5]
Can I use the calculator for moons or dwarf planets?
Yes, good calculators include major moons (like Earth’s Moon, Io, Europa, Titan), some dwarf planets (like Pluto, Ceres), asteroids, and more.[3][4][5]
Is my weight affected by my location on Earth?
Yes, slightly—Earth's gravity is a bit stronger at the poles than at the equator due to shape and rotation. You can weigh up to 1% more at the poles.[4]
Which planet would I weigh the most on?
You would weigh the most on Jupiter because it has the strongest surface gravity of all the planets. However, Jupiter does not have a solid surface to actually stand on.[4][5]
Which worlds would I weigh the least on?
Objects like Pluto, the Moon, or small moons and asteroids have very weak gravity, so your weight can be just a few percent of what it is on Earth.[3][4][5]
Do I need to know my mass or weight for the calculation?
You can usually enter either your weight (on Earth) or your mass, depending on the calculator's settings. The result will adjust based on planetary gravity.[3][4][6]
How is my weight calculated on another planet?
Your weight is calculated using: Weight_on_planet = Weight_on_Earth × (gravity_planet / gravity_earth); or Weight_on_planet = mass × gravity_planet.[3][4][6]
Where do the values for planetary gravity come from?
Gravity values are determined by each object’s mass and radius. For example, Earth’s surface gravity is 9.81 m/s², the Moon’s is 1.62 m/s², and Jupiter’s is about 24.79 m/s².[3][4][5][6]
Why is Jupiter’s gravity defined at the cloud tops?
Jupiter is a gas giant without a solid surface, so surface gravity is defined at the level in the atmosphere called the 'cloud tops.'[4][5]
Can the calculator show my weight on the Sun?
Some calculators show your hypothetical weight on the Sun's surface, but standing on the Sun is, of course, impossible because it's entirely gaseous.[4][5]
Why does mass not change on other planets?
Mass measures the amount of matter you have, which is independent of gravity or location. Weight depends on gravity, but mass does not.[4]
Can I use this calculator to learn about astronauts or animals?
Yes, enter any person’s or animal’s weight or mass to see how gravity would change their weight on other worlds.[5]
Is the calculation affected by atmospheric pressure?
No, only the local gravity matters for weight. Atmospheric pressure may affect how you feel, but not your weight measurement.[4]
How can I estimate my weight on Mars?
Mars’ surface gravity is 0.38 that of Earth. Multiply your Earth weight by 0.38 to get your Mars weight.[4][5][6]
What is the lowest possible body I can select?
Some advanced calculators include very small worlds, like Deimos (Mars’s moon) or asteroids like Vesta and Ceres, where gravity is extremely weak and weight is minimal.[3][4]
How do scientists know planetary masses?
Scientists determine the mass of planets by observing how fast and how far objects orbit the planets, and calculating the gravitational pull necessary to keep them in orbit.[2]
Does the calculator work for exoplanets?
Most calculators only include bodies in our Solar System, but if you know an exoplanet’s gravity, you can apply the same calculation.
Does my weight change permanently when I go to another planet?
No. Your weight only changes while you are on another planet because of its gravity. Return to Earth and your weight returns to normal.
What happens to weight in space far from planets?
In interplanetary or interstellar space, the gravity is so small that you would be weightless, but your mass wouldn’t change.[4]
Can I float away on a tiny asteroid?
Yes. On very small bodies like asteroids, gravity is so weak that you could potentially jump off the surface and float away easily.[3][4]
How does gravity differ among planets?
Gravity depends on a planet’s mass and radius. Bigger, denser planets have stronger gravity; smaller or less dense worlds have weaker gravity.[2][4][5]
Are calculators accurate for children or pets?
Yes, you can enter anyone’s mass or weight—child, adult, or animal—and see the effect of planetary gravity.[5]
Can calculators convert between kilograms, pounds, and Newtons?
Yes, many provide automatic conversions and allow you to select your preferred unit before and after calculation.[1][4][5]
Why is the result so much lower for Pluto and the Moon?
Both have low gravity because they are much less massive than Earth. For example, on the Moon, you weigh about 16% of your Earth weight.[3][4][5]
Would I weigh more on Neptune than on Saturn?
Not necessarily. Saturn has greater mass but lower density, so surface gravity is only slightly higher than Earth’s. Neptune’s is comparable. The exact weight depends on each world’s mass-radius ratio.[5][6]
Does density affect surface gravity?
Yes. Surface gravity depends both on total mass and how concentrated (dense) that mass is within a planet’s radius.[5]
Can calculators simulate changes in gravity due to altitude?
Surface gravity decreases slightly at higher elevations, but most calculators assume you’re at average surface height.[4]
Do calculators also show my age on other planets?
Some tools combine weight and age calculations, showing how time orbits and gravity differ on other worlds.[4]
Is it possible for your weight to be zero somewhere?
In deep space, far from any gravitational source, your weight approaches zero, but never your mass.[4]
Can the calculator be used as a teaching tool?
Yes, it’s commonly used in science classes and outreach to help students visualize the effects of gravity and difference between weight/mass.[7]
Why can’t I stand on the surface of gas giants?
Gas giants like Jupiter and Saturn have no solid surface—gravity values are measured at an arbitrary level in their atmospheres, usually where pressure equals 1 bar.[4][5]
Are calculations always exact?
They’re accurate to published planetary gravity values, but real results might differ slightly depending on local variations or latest measurements.
Can gravity ever be negative?
No, but you could experience ‘apparent weightlessness’ in free fall or orbit even though gravity still acts on you.
Can calculators account for gravitational anomalies?
Specialized tools may include more complex factors, but basic calculators assume uniform gravity for each world.
What is Newton's law relevant for this calculation?
Newton’s law of universal gravitation (F = GMm / r²) provides the foundation for calculating forces (or weight) as gravity changes from planet to planet.[4]
Why do I feel lighter on the Moon?
The Moon’s gravity is about 1/6th that of Earth, so the force pulling you down is much less, making you feel lighter while your mass is unchanged.[4][5]
How can I use the calculator for fun?
You can imagine jumping higher, carrying heavier objects, or even leaping into orbit on tiny moons—just enter your weight and see the results for different bodies.
How big a difference is weight between Mars, Venus, and Earth?
If you weigh 100 kg on Earth, you’ll weigh about 90 kg on Venus and 38 kg on Mars because Venus’s gravity is close to Earth’s, while Mars’s is much weaker.[4][6]
If I travel between planets, will my muscles and bones adapt?
Over time, your body may weaken in low gravity (like the Moon or Mars) and get stronger with higher gravity, since muscles adapt to the forces experienced.
How does a calculator help prepare for space travel?
Knowing changes in weight can help astronauts and engineers design habitats, vehicles, and equipment for different planetary surfaces.
Is it true my weight could nearly disappear somewhere?
Yes, on tiny moons or asteroids, the pull of gravity is so weak that your weight is barely measurable—just fractions of a kilogram or pound.
Do planets’ atmospheres affect weight?
Atmosphere itself doesn’t directly affect your weight—only gravitational acceleration does. Buoyancy in thick atmospheres can make you feel a bit lighter, but weight as measured by a scale stays the same.
Where can I learn more about gravity and planetary science?
Check science museum websites, space agency educational resources, or interactive online tools for detailed guides and experiments.[1][4][5][7]
What is the best way to explore gravity differences?
Try entering different values into the calculator for people, animals, and objects, and see how their weights change across the Solar System—then research why these differences exist!

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