Weight on Other Planets Calculator

A 75 kg person weighs 28.4 kg on Mars, 12.4 kg on the Moon, and a crushing 190 kg on Jupiter's cloud tops — because surface gravity ranges from 1.62 to 24.79 m/s² across the Solar System. Type your weight into the calculator above and you'll see your personal version of that chart in under a second. Below, I'll explain exactly why your weight changes from world to world, what your scale would really say on Mars, and a few results that honestly surprised me the first time I calculated them.

How the Weight on Other Planets Calculator Works

The calculator does one thing and does it precisely: it multiplies your Earth weight by each world's surface gravity relative to Earth's. The formula behind every result you see:

Weight on planet = Your Earth weight × (that world's surface gravity ÷ Earth's 9.81 m/s²)

That ratio is all that matters. Mars pulls on you with 3.71 m/s², Earth pulls with 9.81 m/s², so 3.71 ÷ 9.81 = 0.378 — and 0.378 is the exact fraction of your weight you'd carry on Mars. A 70 kg person becomes 26.5 kg-equivalent. A 150 lb person becomes about 56.7 lb. The calculator runs this same division for all ten worlds — the eight planets, the Moon and Pluto — the moment you press the button.

One honest note about units: scales in daily life are a mess of physics and convention. Kilograms measure mass, pounds technically measure force, and "weight in kg" is really a convenient fiction (your true weight in SI units is measured in newtons — about 687 N for a 70 kg person on Earth). When this calculator says "you would weigh 28.4 kg on Mars," it means the number a spring scale calibrated for Earth would display under Mars gravity. That's the number everyone actually wants, and it's how NASA describes astronaut weights too.

Your Weight on Every World: The Full Chart (75 kg / 165 lb Person)

Here is the complete reference table the card asked for — a 75 kg adult (165 lb), the global average for grown men in many countries, translated to every body in the Solar System:

Every gravity figure comes from NASA planetary fact sheets. Notice something odd: Uranus and Venus, planets separated by billions of kilometres, have almost identical surface gravity — both about 90% of Earth. Gravity doesn't care how big a planet looks; it cares how much mass is packed inside it.

Why Gravity Differs on Every Planet

Surface gravity comes down to two things: a world's mass and its radius. Gravity pulls harder when there's more mass pulling, and weaker when you're standing farther from the centre. Square the distance relationship and you get the formula every physicist uses: g = GM/r², where G is the gravitational constant, M is the planet's mass, and r is its radius.

That r² term explains most of the surprises. Jupiter has 318 times Earth's mass, but you stand at its cloud tops roughly eleven Earth-radii away from its centre, so its gravity ends up "only" 2.53 times ours. Saturn is nearly as wide as Jupiter but much less dense — its average density is lower than water, which means in an impossibly large bathtub, Saturn would float. Mercury is tiny, yet its iron core packs it densely enough to pull almost exactly as hard as Mars does, a planet with nearly twice Mercury's radius.

The rocky inner planets (Mercury, Venus, Earth, Mars) sit between 0.38 and 1.0 g because they're made of similar heavy stuff — iron and silicate rock. The ice and gas giants outspread it from 0.9 to 2.5 g. And Pluto, a dwarf planet barely 1,188 km across, only manages 6.3% of Earth's pull. Size, mass and density dance together, and gravity is the score.

Weight on Mars: The Question Everyone Asks

Mars is the star of this page, so let's do it properly. Mars is smaller than Earth — about half the diameter — and holds only about 10.7% of Earth's mass. Stand on the red dirt and you'd feel 3.71 m/s² pulling you down: 37.8% of what you feel right now.

Real numbers, computed the same way our calculator does: a 50 kg child would weigh 18.9 kg on Mars, a 60 kg adult 22.7 kg, a 70 kg adult 26.5 kg, and a 90 kg adult 34 kg. In pounds: 100 lb becomes 37.8 lb, and a 200 lb person would weigh about 75.6 lb — lighter than most checked-baggage limits.

Here's my favourite way to feel that number: on Earth, a decent vertical jump clears half a metre. With the same legs on Mars you'd leap about 1.3 metres — over the head of most people you know. And the hardware agrees with the maths: NASA's Perseverance rover weighs 1,025 kg on Earth, but on Mars it presses down with the force of just 388 kg. Every Mars landing calculation, every parachute design, every crane-drop sky manoeuvre runs on exactly this ratio.

Weight on the Moon: 12.4 kg and Three-Metre Jumps

The Moon's surface gravity is 1.62 m/s² — just 16.5% of Earth's. Our 75 kg reference person would weigh 12.4 kg there, less than a typical carry-on suitcase. The Apollo records make it personal: Neil Armstrong's pressurised lunar suit weighed about 180 lb (81 kg) on Earth, but on the Moon it pressed down with the weight of a 3-year-old child — roughly 30 lb. That's why the Apollo astronauts' lope across the Sea of Tranquility looks like slow-motion ballet, and why a 0.5 m Earth jump becomes a 3 m leap in lunar gravity.

One caution the movies get wrong: low gravity doesn't mean you can move normally. Momentum (mass × velocity) is unchanged, so quick direction changes still slam you around, which is exactly what the Apollo crews discovered when they tried to jog. If you want to feel that landing-on-the-Moon tension yourself, our Astro Lander game simulates the Moon's real 1.62 m/s² pull — get your descent speed under 2 m/s or the module is scrap metal.

Jupiter, Saturn and the Gas Giants: Heavier Than You'd Believe

Jupiter is the heavyweight champion, but not by the margin most people guess. At its cloud tops the pull is 24.79 m/s² — 2.53 times Earth. Our 75 kg person would tip a Jupiter scale at 189.5 kg, and a 165 lb person would read a shocking 417 lb. There's a technical catch, though: Jupiter has no solid surface to stand on. You'd sink through ammonia ice clouds and hydrogen gas until pressure crushed you, so "your weight on Jupiter" really means your weight at the same atmospheric pressure that passes for a surface. Astronomers use the 1-bar cloud-top level; it's the standard convention and the number our calculator reports.

Saturn plays the best trick in the Solar System: with 10.44 m/s², it pulls only 6.4% harder than Earth. Our 75 kg person would weigh 79.8 kg — barely notice the difference on a scale. Uranus and Neptune, the ice giants, land at 90.4% and 113.7% respectively. Imagine flying four billion kilometres to Neptune just to find your weight barely changed: 75 kg there reads 85.2 kg.

Mercury and Venus: The Heavyweight Twins

Mercury and Venus make the strangest pair in this table. Mercury is a scorched, airless crater-world; Venus is a furnace wrapped in crushing clouds. Yet Mercury pulls with almost exactly the same strength as Mars — 3.70 versus 3.71 m/s² — despite the two worlds being nothing alike, and Venus pulls at 8.87 m/s², barely 10% below Earth. Mercury manages it through raw density: an enormous iron core fills about 85% of its radius, the biggest of any planet. Venus manages it through sheer size: nearly Earth's diameter and 81% of Earth's mass. On Venus you'd weigh 10% less than at home; on Mercury you'd feel as light as you would on Mars. Climate aside, only the walk outside would tell you which world you'd landed on.

Mass vs Weight: Why Astronauts Aren't Actually Weightless

Your mass is the amount of matter in you — 75 kg is 75 kg on Earth, Mars, the Moon or drifting in deep space. Nothing changes it except eating, dieting or relativistic physics we can ignore here. Your weight is a force: mass multiplied by local gravity. Same person, ten different weights across the Solar System, and that's the entire point of this calculator.

Even astronauts on the International Space Station aren't massless — they still have their full 60, 75 or 90 kg of matter, and Earth still pulls on them with about 89% of ground-level gravity. What they lack is apparent weight: the station and everything in it falls around Earth together, so nothing pushes back on the scale. On Pluto, by contrast, a 75 kg person genuinely weighs 4.7 kg-equivalent — a real spring-scale reading, not a falling trick. Gravity low enough that a phone dropped from your hand would take about 1.8 seconds to fall one metre. Try dropping your phone from one metre here — about 0.45 seconds — and you'll appreciate the difference.

Kilograms, Pounds and What the Scale Really Measures

Because weight is a force, scientists log it in newtons: 75 kg on Earth weighs about 736 N (75 × 9.81). Scales show "kg" or "lb" because those units are practical — a bathroom scale on Mars calibrated for Earth would show 28.4 "kg" for our reference person, and that's the convention this calculator and NASA's own weight-on-other-worlds material use. Pounds work the same way: 165 lb Earth becomes 62.4 lb on Mars and a back-breaking 417 lb on Jupiter. If you switch units in the calculator above, the maths doesn't change — only the label does, which is exactly why we offer both.

Compare Different Body Weights at a Glance

Not everyone weighs 75 kg, so here's the same physics across common weights — in both kilogram and pound terms, for the three worlds people actually search for:

Want a creature-weight sanity check? A 6,000 kg African elephant would weigh about 991 kg on the Moon — still elephant-sized, but with gravity that weak it could genuinely launch itself with one irritated stomp of a leg.

Fun Things to Calculate Right Now

The calculator accepts any number up to 100,000, so push it further than your own weight:

• Your pet. A 5 kg cat weighs 0.8 kg on the Moon and 1.9 kg on Mars — apex predator of the lunar living room.
• Your car. A 1,500 kg hatchback would tip 567 kg on Mars. Mars gravity is why rover designs can carry more science per kilogram of launch mass.
• Your luggage. The 23 kg airline bag becomes 8.7 kg on Mars — and 58.1 kg on Jupiter. Pack accordingly for the gas giants.
• A blue whale. 150,000 kg on Earth becomes about 24,800 kg on the Moon. Even whales would look graceful there.

After the weighing is done, find out how fast you'd age with our Age on Other Planets calculator — a 30-year-old Earthling is only about 16 in Mars years. Or rest your aching, Jupiter-weary fingers on our space bar clicker for a click-speed test, and round the day off with the space trivia quiz to prove you absorbed all ten gravity values. The full physics write-up of the most-asked question lives in Weight on Mars, Explained, and if you'd rather dodge asteroids than calculate them, Astro Dodge is one click away.

Frequently Asked Questions

How much would I weigh on Mars?

About 37.8% of your Earth weight, because Mars's surface gravity is 3.71 m/s² versus Earth's 9.81 m/s². A 70 kg person weighs about 26.5 kg-equivalent on Mars; in pounds, 100 lb becomes about 37.8 lb.

How much would I weigh on the Moon?

About 16.5% of your Earth weight. The Moon's gravity is 1.62 m/s², so 75 kg becomes 12.4 kg-equivalent — light enough to jump roughly three metres high with Earth-trained legs.

On which planet would I weigh the most?

Jupiter, at 24.79 m/s² — about 2.53 times Earth. A 75 kg person would weigh about 190 kg on Jupiter's cloud tops. Neptune and Saturn follow, then Earth itself beats Venus, Uranus and Mercury.

Why does weight change on other planets but mass does not?

Mass is the amount of matter in your body and travels unchanged. Weight is the gravitational force on that mass, so it scales directly with each world's surface gravity — same you, different pull.

What would 100 pounds weigh on Mars?

About 37.8 pounds-equivalent. Multiply pounds by 0.378 for Mars: a 200 lb person weighs about 75.6 lb there, and our calculator switches between kg and lb automatically.

Is Pluto's gravity strong enough to walk normally?

Walking would be possible but comically bouncy. Pluto's gravity is 0.62 m/s² — 6.3% of Earth's — so a 75 kg person weighs about 4.7 kg-equivalent, and a normal step would lift you higher than a full jump on Earth.