Weight on Other Planets Calculator
Enter your mass or Earth weight and instantly see what you would weigh on the Moon, Mars, Jupiter, the Sun, Pluto and every other planet in the Solar System.
Find Out What You Would Weigh on the Moon, Mars or Jupiter
Weight on Planets Formula
Where:
- \(W\) — weight, the force gravity exerts on you (newtons, N)
- \(m\) — your mass (kg); it never changes from world to world
- \(g\) — surface gravity of the body you are standing on (m/s²)
- \(g_{\oplus}\) — standard Earth surface gravity, 9.80665 m/s²
- \(W_{\text{kgf}}\) — the scale reading in kilogram-force (what a bathroom scale would display in kg)
Your weight is simply your mass multiplied by the local pull of gravity. Since your mass is the same everywhere, dividing the local gravity by Earth's gravity gives you your weight as a fraction of your Earth weight.
Weight on Planets – Calculation Example
Example: a person with a mass of 70 kg wants to know their weight on the Moon, Mars and Jupiter.
\[ W_{\text{Moon}} = 70 \cdot \frac{1.62}{9.80665} = 11.57 \, \text{kgf} \]
\[ W_{\text{Mars}} = 70 \cdot \frac{3.71}{9.80665} = 26.48 \, \text{kgf} \]
\[ W_{\text{Jupiter}} = 70 \cdot \frac{24.79}{9.80665} = 176.94 \, \text{kgf} \]
\[ W_{\text{Earth}} = 70 \cdot 9.80665 = 686.47 \, \text{N} \]
Result: on the Moon the scale would read 11.57 kg (25.48 lb), on Mars 26.48 kg (58.39 lb), and on Jupiter 176.94 kg (390.09 lb). On Earth the same person weighs 686.47 N, which a scale displays as 70 kg.
How to Use the Weight on Planets Calculator
- Type your number into the field Your mass (or Earth weight). If you only know your weight on Earth, that number works too — on Earth, weight in kg (or lb) equals mass closely enough for this calculation.
- Pick the unit — kg or lb — in the Unit dropdown next to the input field.
- Read the result table Your Weight Across the Solar System: it shows your weight on the Moon, all eight planets, Pluto and the Sun, in both kg and lb, together with each body's surface gravity and the percentage of your Earth weight.
- Check the second result block for the exact formula, your weight in newtons and detailed notes on the values used.
Mass vs Weight: Why You Would Weigh Less on the Moon
In everyday language "mass" and "weight" are interchangeable, but in physics they are different quantities. Mass is the amount of matter in your body — it is the same whether you stand on Earth, float on the Moon or drift through deep space. Weight is a force: the gravitational pull acting on that mass, calculated as \(W = m \cdot g\). When the local gravity \(g\) changes, your weight changes with it.
The Moon's surface gravity is only 1.62 m/s², about 16.5% of Earth's 9.80665 m/s². That is why a 70 kg person weighs only about 11.6 kg (25 lb) there — not because they lost mass, but because the Moon pulls on them more gently. On Mars, with \(g = 3.71\) m/s², the same person weighs roughly 38% of their Earth weight, which is why future astronauts will be able to jump much higher and carry heavier equipment than they could at home.
Jupiter is the opposite extreme: at 24.79 m/s², its cloud-top gravity is 2.53 times Earth's, so a 70 kg person would feel like they weighed nearly 177 kg. The Sun's gravity of 274 m/s² is about 28 times Earth's — a scale there would read almost 2 tonnes for an average adult. Note that the results are shown as scale readings (kilogram-force and pound-force). Physically, weight is measured in newtons; a scale simply converts the force back into an "equivalent mass" using Earth's gravity.
Assumptions, Limitations and Practical Notes
- Surface gravity values come from NASA's planetary fact sheets (equatorial surface gravity): Moon 1.62, Mercury 3.70, Venus 8.87, Mars 3.71, Jupiter 24.79, Saturn 10.44, Uranus 8.87, Neptune 11.15, Pluto 0.62 and the Sun 274.0 m/s².
- The gas giants have no solid surface. For Jupiter, Saturn, Uranus and Neptune, "surface" gravity is defined at the cloud-top level where atmospheric pressure equals Earth's sea-level pressure — you could not actually stand there.
- Rotation and latitude are ignored. A planet's spin slightly reduces the effective gravity at the equator, so real readings would vary by a fraction of a percent depending on where you stand.
- Unit handling: if you enter pounds, they are treated as pounds-mass with 1 lb = 0.45359237 kg. The kg column shows kilogram-force (1 kgf = 2.2046226 lbf), i.e. what a spring scale calibrated on Earth would display.
- Pluto is included as a dwarf planet for comparison — at 0.62 m/s², you would weigh only about 6% of your Earth weight there.
Where This Idea Shows Up in Physics
Weight is one of the most common applications of Newton's second law, \(F = m \cdot a\). The same principle governs many related problems you can explore with our other tools: see how gravity does work on an object with the potential energy calculator, analyse motion under constant acceleration with the kinematic equations solver, or study how forces combine on a slope with the inclined plane calculator.
Frequently Asked Questions
How do I calculate my weight on another planet by hand?
Take your mass in kg and multiply it by the planet's surface gravity, then divide by 9.80665 (Earth's gravity). For example, on Mars: \(70 \cdot 3.71 / 9.80665 \approx 26.5\) kg. If you want the force in newtons, skip the division: \(W = m \cdot g\), so on Mars a 70 kg person weighs \(70 \cdot 3.71 \approx 259.7\) N.
Why would I weigh less on the Moon but keep the same mass?
Mass measures how much matter your body contains, and it does not depend on location. Weight is the gravitational force pulling on that mass, \(W = m \cdot g\). Since the Moon's gravity (1.62 m/s²) is only about 16.5% of Earth's, a scale there reads roughly one sixth of your Earth weight — your body itself is unchanged.
Which planet would I be lightest and heaviest on?
Among the planets, you would be lightest on Mars (about 38% of your Earth weight) and heaviest on Jupiter (about 253%). Including moons and dwarf planets, Pluto is the lightest at roughly 6% of Earth weight. The Sun is the extreme: its surface gravity of 274 m/s² is about 28 times Earth's, so a 70 kg person would register nearly 2 tonnes there.
Could I actually stand on Jupiter, Saturn, Uranus or Neptune?
No. The gas giants have no solid surface — the gravity values used (e.g. 24.79 m/s² for Jupiter) refer to the cloud-top level where atmospheric pressure equals Earth's sea-level pressure. There is nothing to stand on; you would sink into denser and denser gas. The numbers are a useful physics comparison, not a description of a real landing site.
Why does the calculator show weight in kg instead of newtons?
Bathroom scales measure force but display it as an equivalent mass, so the calculator shows what a scale would read in kg (kilogram-force) and lb (pound-force). Physically correct weight is in newtons: on Earth a 70 kg person weighs about 686 N. To convert, multiply the kg reading by 9.80665, or the lb reading by 4.448.
How do I convert pounds to kilograms for this calculation?
Multiply pounds by 0.45359237 to get kilograms. A 150 lb person has a mass of about 68 kg, so on the Moon they would weigh roughly 11.2 kg (about 25 lb) on a scale. The calculator handles this automatically if you select lb as your input unit.
Does gravity vary across a planet's surface?
Yes, slightly. A planet's rotation reduces effective gravity at the equator, and altitude, latitude and local geology also matter. On Earth this variation is under 1% (from about 9.76 to 9.83 m/s²). The calculator uses single equatorial values from NASA fact sheets, so real local readings could differ by a fraction of a percent.