Your Weight on the Moon, Mars, Jupiter, and More
Use It in 30 Seconds
Type your weight on other planets by entering what the bathroom scale says on Earth. The calculator multiplies that number by each body's surface gravity ratio and hands you a table: Moon, Mars, Jupiter, Saturn, every major world in one glance. If you weigh 150 lb on Earth, you'll see roughly 25 lb on the Moon and 380 lb on Jupiter — same body, wildly different gravitational pull.
Pick pounds or kilograms, hit calculate, and the bar chart fills in. Want to test a made-up exoplanet? Enter a custom gravity value (in m/s² or as a multiple of Earth's g) and the tool adds it to the comparison. The whole thing runs in your browser — no sign-up, no data stored.
What the Numbers Mean
Your mass — the amount of matter in your body — stays exactly the same whether you're standing on Mars or floating near Pluto. What changes is weight, the force gravity exerts on that mass. The formula is simple: Weight = Mass × gravitational acceleration. Earth's gravitational acceleration is about 9.81 m/s². The Moon's is 1.62 m/s², roughly one-sixth as strong. Multiply your mass by each planet's number and you get a different scale reading every time.
When the tool says “you weigh 25 kg on the Moon,” it means a scale calibrated for Earth would read 25 kg there. Your mass hasn't shrunk — gravity just pulls less. This single distinction trips up most people, and it's the whole reason the calculator exists: to make the difference between mass and weight something you can feel, not just memorize.
Walkthrough: 70 kg Across the Solar System
Say you're 70 kg on Earth and curious about every stop on a solar system road trip. Here's what the calculator returns:
Notice that Mercury and Mars share almost the same gravity ratio despite being completely different worlds — Mercury is dense and tiny, Mars is larger but less dense. Saturn, 95 times Earth's mass, barely outweighs Earth's pull at its cloud tops because its radius is enormous. Size alone doesn't decide gravity — mass and radius work together, and this table makes that obvious at a glance.
Traps to Avoid
Swapping mass and weight. If you type 70 thinking kilograms of mass but the tool expects pounds, your results will be off by a factor of 2.2. Check the unit label before you hit calculate.
Assuming “bigger planet = stronger gravity.” Jupiter is 318 times Earth's mass yet only 2.5 times Earth's surface gravity. Its radius is so large that you stand far from the center of mass, weakening the pull. Saturn is even more extreme — nearly 100 Earth masses, but just 1.07 g at the cloud tops because it's puffed up with hydrogen.
Thinking you can “stand on” Jupiter. Gas giants have no solid surface. The gravity number refers to the altitude where atmospheric pressure matches Earth's sea level. You wouldn't be standing — you'd be floating in a thick, crushing atmosphere. The calculator treats it as a surface for comparison purposes, and that's worth knowing before you drop it into a school report.
Ignoring local variation. Gravity isn't perfectly uniform on any world. Earth's own gravitational acceleration ranges from about 9.78 m/s² at the equator to 9.83 m/s² at the poles because the planet bulges and spins. The values in this tool are standard averages — accurate enough for classroom work, not for spacecraft navigation.
Edge Cases Worth Exploring
Dwarf planets and large moons. Pluto's gravity is 0.063 g — a 70 kg person would weigh under 5 kg. On Titan, Saturn's largest moon, gravity is 0.138 g, which is lower than Earth's Moon. Europa sits at about 0.134 g. These numbers matter if you care about future exploration targets: landing and taking off is cheap in fuel when gravity is that low.
Custom exoplanets. Kepler-442b is a confirmed exoplanet in the habitable zone with an estimated surface gravity around 1.3 g. Plug 12.75 m/s² into the custom field and a 70 kg person becomes 91 kg — heavier than Earth but not crushing. That's the kind of thought experiment that makes orbital discovery personal.
The Sun. Surface gravity is about 274 m/s² — roughly 28 times Earth's. A 70 kg person would “weigh” nearly 1,960 kg. Obviously you'd never survive the heat, but the number is useful for understanding why the Sun holds the entire solar system in orbit.
Asteroids. Ceres, the largest asteroid, has surface gravity around 0.029 g. You could launch yourself into orbit with a running jump. Smaller asteroids have even less — on some, you'd need to tether yourself down to avoid drifting away.
Fast Clarifications
Would I really weigh less on Mars? Yes. A bathroom scale on Mars would show about 38% of your Earth reading. Your body hasn't changed — the planet simply pulls less hard.
What would I weigh on Jupiter if it has no ground? The calculator uses Jupiter's gravity at the 1-bar pressure level (equivalent to Earth's sea-level atmosphere). That's the standard reference altitude for gas giants. You'd be suspended in dense gas, not standing on rock.
Do astronauts actually feel lighter on the Moon? Absolutely. Apollo crews could hop several feet off the ground in 180-pound spacesuits because those suits weighed only about 30 lb in lunar gravity. The footage looks slow-motion partly because they were genuinely bouncing.
Is this accurate enough for homework? For any introductory physics or astronomy class, yes. The gravity ratios come from NASA's Planetary Fact Sheet. For mission-planning precision, engineers use full gravitational models that account for altitude, latitude, and local density.
Where to Go Next
Once you've compared weights, try the Age on Planets calculator to see how many birthdays you'd have on Mercury (spoiler: a lot) or how long a single Jupiter year lasts in Earth time. Together, the two tools cover the most-asked solar system questions in one sitting.
Sources
- NASA Planetary Fact Sheet — Surface gravity values and physical parameters for all major solar system bodies.
- NASA Solar System Exploration — Educational overviews of planetary mass, radius, and gravitational characteristics.
- JPL Solar System Dynamics — Precise physical parameters used in mission planning and orbital mechanics.
Frequently Asked Questions about Weight on Other Planets
What does the Weight on Other Planets Calculator actually do?
This calculator takes your weight on Earth (or your mass) and shows what you would weigh on other planets, moons, and celestial bodies across the solar system—and even hypothetical custom-gravity worlds. It uses each body's surface gravity to compute the gravitational force (weight) you'd experience there. For example, if you weigh 150 pounds on Earth, you'd weigh about 25 pounds on the Moon (1/6 Earth's gravity) or 380 pounds on Jupiter (2.5× Earth's gravity). The tool helps you visualize how gravity varies across different worlds and builds intuition about mass, weight, and surface gravity in a fun, personal way.
Why does my weight change on other planets but my mass does not?
Mass is the amount of matter in your body—measured in kilograms—and it never changes no matter where you go (Earth, Moon, Mars, deep space). Weight is the gravitational force pulling on your mass, and it depends on both your mass and the local gravity. Since different planets have different surface gravity (due to their mass and size), the force—your weight—changes even though your mass stays constant. Think of it this way: you're the same person everywhere, but the 'pull' you feel from the planet beneath your feet is stronger or weaker depending on where you are.
Where do the gravity values for each planet come from?
The calculator uses standard surface gravity values that are widely accepted in educational and scientific contexts. These values come from NASA, ESA, and astronomical databases, based on each body's mass and radius. For example: Earth ≈ 9.81 m/s² (1.0 g), Moon ≈ 1.62 m/s² (0.166 g), Mars ≈ 3.71 m/s² (0.378 g), Jupiter ≈ 24.79 m/s² (2.53 g). These are approximations—actual gravity can vary slightly by location, altitude, and latitude—but they're accurate enough for learning, classroom demonstrations, and curiosity-driven exploration.
How accurate are these weights compared to real scientific data?
The calculator is educationally accurate: it uses well-established surface gravity values and performs mathematically correct weight calculations. For classroom learning, homework, science fair projects, and general curiosity, the results are precise enough to build strong conceptual understanding. However, this tool is not designed for high-precision engineering, spacecraft mission planning, or scientific research that requires accounting for local gravity variations, altitude adjustments, or terrain-specific measurements. For those purposes, you'd need specialized software and peer-reviewed datasets. For everything else—learning, fun, and building intuition—this calculator is perfect!
What is the difference between kilograms of mass and kilograms on a bathroom scale?
This is one of the most confusing aspects of everyday language vs physics! Kilograms (kg) is technically a unit of mass—how much matter is in you—and should never change. But when you step on a bathroom scale and it shows '70 kg,' it's actually measuring weight (the force of Earth's gravity on you) and displaying it as an equivalent mass under Earth's gravity. In physics, your weight should be measured in newtons (N): a 70 kg person on Earth weighs 686.7 N. On the Moon, that same 70 kg mass weighs only 113.4 N, which a scale would show as '11.6 kg.' So when the calculator says 'you weigh 25 kg on the Moon,' it's shorthand for 'your weight force corresponds to what a 25 kg mass would weigh on Earth.'
Why do giant planets not always have extreme surface gravity despite being very massive?
Great question! Surface gravity depends on both mass AND radius. The formula is g = GM/r², where M is mass and r is radius. Jupiter is 318 times more massive than Earth, but its radius is also 11 times larger. That larger radius means you'd be standing much farther from Jupiter's center, which weakens the gravity you feel at the 'surface' (Jupiter's cloud tops). The result? Jupiter's surface gravity is 'only' 2.53× Earth's, not 318×. Saturn is even more extreme: despite being huge, its low density (it would float on water!) means its surface gravity is just 1.07× Earth's. Size alone doesn't determine surface gravity—you need to know both mass and how spread out that mass is.
Can I use custom gravity to simulate fictional planets or exoplanets?
Absolutely! If the calculator has a custom gravity mode, you can enter any surface gravity value (in m/s² or as a multiple of Earth's g) to explore hypothetical worlds. Want to imagine a super-Earth with 1.5× Earth's gravity? Enter 14.7 m/s² (1.5 g) and see what you'd weigh. Creating a low-gravity moon colony for a sci-fi story? Try 0.2 g. This mode is perfect for worldbuilding in games, novels, or RPGs, exploring real exoplanets whose gravity has been estimated by astronomers, or doing physics thought experiments about extreme gravity environments. It's one of the most fun and creative uses of the tool!
Why does my weight on the Moon come out as a fraction of my Earth weight?
Because the Moon's surface gravity is much weaker than Earth's! The Moon has 1/6 of Earth's gravity (about 1.62 m/s² vs Earth's 9.81 m/s²), so your weight force is 1/6 as strong. If you weigh 150 pounds on Earth, you weigh about 25 pounds on the Moon. This low gravity is why Apollo astronauts could hop around easily despite wearing heavy spacesuits (which weighed only ~30 lb on the Moon instead of 180 lb on Earth). The Moon's lower mass (1/81 of Earth's) and smaller size combine to create much weaker surface gravity, making everything feel lighter—though your mass never changes!
Can I use this tool for school science and physics homework?
Yes! This calculator is designed for students. It's perfect for homework problems like 'Calculate the weight of a 60 kg astronaut on Mars' (answer: 60 × 3.71 = 222.6 N), 'Compare your weight on three planets,' or 'Explain why weight changes but mass doesn't.' You can use it to check your manual calculations, explore 'what if' scenarios to build intuition, and create charts or tables for presentations and reports. Teachers often assign problems that require students to compute weight on different bodies—this tool ensures you get the numbers right and helps you focus on understanding the concepts (gravity, mass, weight, force) rather than getting bogged down in arithmetic.
Is this calculator suitable for serious engineering or mission planning?
No—this is an educational and exploration tool, not a professional-grade engineering resource. While the math is accurate and the gravity values are standard, real spacecraft mission planning requires: (1) High-precision gravitational models that account for local variations, (2) Terrain-specific data (altitude, landing site), (3) Detailed mass budgets for payloads and fuel, (4) Peer-reviewed datasets from NASA/ESA/JAXA. For learning, classroom demos, science fair projects, homework, and curiosity, this calculator is perfect. For actual spaceflight design, astronaut safety calculations, or official space agency work, use professional tools and consult with aerospace engineers. Think of this as a gateway to understanding the concepts, not a replacement for mission-critical systems.
What happens to my weight on planets with no solid surface like Jupiter or Saturn?
Jupiter and Saturn are gas giants—they don't have a solid surface to stand on! When the calculator shows 'your weight on Jupiter,' it's referring to the gravitational force you'd experience at the altitude where atmospheric pressure equals Earth's sea-level pressure (about 1 bar). This is a conceptual reference point used for comparison. In reality, you could never 'stand' on Jupiter—you'd sink through layers of gas (and eventually liquid hydrogen) until crushing pressure and heat destroyed you long before reaching any hypothetical core. But for learning purposes, that reference altitude gives you a simple way to compare Jupiter's gravity with Earth's.
How does this relate to astronaut training and the challenges of living in space?
The weight differences you see in this calculator have real implications for human spaceflight. On the Moon or Mars (low gravity), astronauts face bone density loss (bones lose ~1% mass per month without exercise), muscle atrophy (muscles weaken when they don't have to work against strong gravity), and cardiovascular deconditioning (hearts don't have to pump as hard, so they weaken). That's why ISS astronauts exercise 2+ hours daily. In high gravity (like simulated centrifuge training), the opposite happens—hearts strain, joints hurt, and movement is exhausting. Understanding weight changes is the first step in appreciating the medical and engineering challenges of living beyond Earth. Future Mars colonists will need special exercise regimens, artificial gravity habitats, or other interventions to stay healthy.
Can I compare my weight to objects or animals, not just myself?
Yes! While the calculator is designed for personal weight, you can enter any mass or weight to explore gravity's effects. Want to know how much a 500 kg satellite would weigh on Mars? Enter 500 kg. Curious about a 10 kg dog on the Moon? Enter 10 kg. This is useful for understanding how payload mass (cargo, equipment) relates to launch requirements, landing systems, and surface operations on other worlds. It's also fun for thought experiments: 'How heavy is a car on Jupiter?' 'Would a 200 lb anvil be easier to lift on Mars?' The physics is the same—weight = mass × gravity—no matter what object you're considering.
What if I want to know my weight on moons like Titan or Europa?
If the calculator includes moons in its list of celestial bodies, you can select them directly! Titan (Saturn's largest moon) has about 0.14 g (14% Earth's gravity), so you'd weigh much less than on Earth. Europa (Jupiter's icy moon) has about 0.13 g. Ganymede (Jupiter's largest moon, bigger than Mercury) has about 0.15 g. If your desired moon isn't listed, use the custom gravity mode: look up the moon's surface gravity (e.g., from NASA fact sheets) and enter it manually. Many sci-fi stories and future colonization plans involve moons, so exploring their gravity is both educational and creatively inspiring!
How can teachers use this calculator in the classroom?
Teachers love this tool for making physics tangible and personal! Ideas: (1) Live demo: Ask students to share their weights (or use an average), plug into the calculator, project results—instant engagement when students see 'I'd weigh 500 pounds on Jupiter!' (2) Homework assignment: 'Calculate your weight on 5 planets, explain why it changes, and create a bar chart.' (3) Science fair support: Help students build interactive displays with the calculator as the computational engine. (4) Cross-curricular: Combine with writing (sci-fi stories set on Mars), art (draw yourself on different planets), or history (Apollo Moon landings and why astronauts could hop). (5) Discussion prompts: 'Why would living on Mars long-term cause health problems?' 'What engineering challenges do high-gravity planets pose?' The calculator turns abstract concepts into memorable, student-centered experiences.
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