Weight on other planets calculator
Sun
1,953.2 kg
19,180 N · × 27.9
Mercury
26.4 kg
259 N · × 0.38
Venus
63.2 kg
620.9 N · × 0.9
Earth
70 kg
687.4 N · × 1
Moon
11.5 kg
113.4 N · × 0.16
Mars
26.6 kg
261.1 N · × 0.38
Jupiter
184.8 kg
1,814.4 N · × 2.64*
Saturn
79.8 kg
783.3 N · × 1.14*
Uranus
64.2 kg
630.7 N · × 0.92*
Neptune
80.3 kg
788.9 N · × 1.15*
Pluto
4.4 kg
43.4 N · × 0.06
The reading is what a bathroom scale set up on Earth would show. N is the weight itself, mass × gravity. * Giant planets have no solid surface; their gravity is at the 1 bar level. Gravity from NASA's Planetary Fact Sheet.
- Mass: 70 kg, the same on every planet
- Weight on Mars: W = m × g = 70 kg × 3.73 m/s² = 261.1 N
- Compared with Earth: 3.73 ÷ 9.82 = 0.38
- A scale set up on Earth would read 70 kg × 0.38 = 26.6 kg
How it works
A bathroom scale measures how hard you press down on it, then shows that as kilograms or pounds using Earth's gravity. Take the same scale to Mars and you press down with only 0.38 times the force, so it shows 0.38 times the number.
So the sum is your Earth reading multiplied by the body's gravity, divided by Earth's. Mars has a surface gravity of 3.73 m/s² and Earth 9.82 m/s², so 70 kg on Earth reads 70 × 3.73 ÷ 9.82 = 26.6 kg on Mars. Pick any body under the cards to see the working, including the weight in newtons.
The gravity figures are all from NASA's Planetary Fact Sheet, which gives Earth as 9.82 m/s². That is a little above standard gravity, 9.80665 m/s², which is a fixed number agreed for defining units. Using NASA's own figure for Earth keeps every ratio on one footing.
Mass and weight are not the same
Your mass is how much of you there is, in kilograms. It's the same on the Moon as it is at home. Your weight is the force gravity pulls you down with, in newtons: mass × gravity. A 70 kg person weighs 70 × 9.82 = 687 N on Earth and 70 × 1.62 = 113 N on the Moon.
In everyday speech weight is given in kilograms or pounds, and that's what a bathroom scale shows, because it's a spring or a load cell that measures force and assumes Earth's gravity. A balance scale, which compares you with a set of weights, would read the same anywhere, because the weights get lighter by the same amount you do.
Surface gravity of each body
| Body | Gravity (m/s²) | Times Earth's | 70 kg reads |
|---|---|---|---|
| Sun | 274.0 | 27.90 | 1,953 kg |
| Mercury | 3.70 | 0.38 | 26.4 kg |
| Venus | 8.87 | 0.90 | 63.2 kg |
| Earth | 9.82 | 1 | 70 kg |
| Moon | 1.62 | 0.16 | 11.5 kg |
| Mars | 3.73 | 0.38 | 26.6 kg |
| Jupiter | 25.92 | 2.64 | 184.8 kg |
| Saturn | 11.19 | 1.14 | 79.8 kg |
| Uranus | 9.01 | 0.92 | 64.2 kg |
| Neptune | 11.27 | 1.15 | 80.3 kg |
| Pluto | 0.62 | 0.06 | 4.4 kg |
Printable chart and worksheet
Your weight on other planets
Name:
1. Your weight on Earth: . Multiply it by the × Earth number to fill in your weight on each body.
| Body | Gravity (m/s²) | × Earth | Your weight |
|---|---|---|---|
| Sun | 274 | 27.90 | |
| Mercury | 3.7 | 0.38 | |
| Venus | 8.87 | 0.90 | |
| Earth | 9.82 | 1.00 | |
| Moon | 1.62 | 0.16 | |
| Mars | 3.73 | 0.38 | |
| Jupiter* | 25.92 | 2.64 | |
| Saturn* | 11.19 | 1.14 | |
| Uranus* | 9.01 | 0.92 | |
| Neptune* | 11.27 | 1.15 | |
| Pluto | 0.62 | 0.06 |
* A gas or ice giant, with no solid surface. Its gravity is given where the pressure is 1 bar, about the air pressure at sea level on Earth.
2. Weight in newtons = mass in kg × gravity. Show your working.
- A scooter has a mass of 27 kg. What does it weigh on Neptune, in newtons?
- A bathroom scale reads 52 kg on Earth. What would it read on Mercury?
- Something weighs 243 N on Uranus. What is its mass?
- A bag of shopping has a mass of 10 kg. What does it weigh on Mars, in newtons?
- A bathroom scale reads 37 kg on Earth. What would it read on Jupiter?
- Something weighs 7 N on Pluto. What is its mass?
3. An astronaut has a mass of 80 kg on Earth. What is their mass on the Moon?
Your weight on other planets: answer key
1. Each weight on Earth × the number in the × Earth column.
2.
- 27 × 11.27 = 304.3 N
- 52 × 0.38 = 19.8 kg
- 243 ÷ 9.01 = 27 kg
- 10 × 3.73 = 37.3 N
- 37 × 2.64 = 97.7 kg
- 7 ÷ 0.62 = 11.3 kg
3. 80 kg. Mass doesn't change from place to place. Their weight on the Moon is less: 80 × 1.62 = 129.6 N, against 80 × 9.82 = 785.6 N on Earth.
The printable sheet
The first page is a chart of every body's gravity with a column to fill in. Type a weight above it to print the chart filled in, or leave it blank for a class to work out their own. Below the chart are weight questions, and the answer key is on the next page.
Each sheet number gives its own questions. Print on A4 or US Letter.
Questions
How much would I weigh on the Moon?
About a sixth of your Earth weight. The Moon's gravity is 1.62 m/s² against Earth's 9.82, so a scale reading 70 kg on Earth would read 11.5 kg there.
How much would I weigh on Mars?
0.38 times your Earth weight. 70 kg becomes 26.6 kg and 150 lb becomes 57 lb.
Where would I weigh the most?
On the Sun, nearly 28 times your Earth weight, though nothing could stand there. Of the planets, Jupiter is the heaviest at 2.64 times Earth.
Where would I weigh the least?
Pluto, at about 0.06 times your Earth weight: 70 kg reads 4.4 kg. Of the planets, Mercury and Mars are lightest, both about 0.38.
Does my mass change on another planet?
No. Mass is the amount of matter in you and is the same everywhere. Only weight, the pull of gravity on that mass, changes.
Why is Saturn's gravity so close to Earth's when it's so big?
Surface gravity depends on mass divided by the radius squared. Saturn has 95 times Earth's mass but over 9 times its radius, so the two nearly cancel and gravity at its 1 bar level is 11.19 m/s².
Can I use stones or newtons?
Yes. Pick stones and pounds, or newtons, as the unit. A stone is 14 lb, and a pound is exactly 0.45359237 kg.
Sources
- NASA Planetary Fact Sheet (gravity, mass and radius of each body)
- NIST CODATA: standard acceleration of gravity
- Wikipedia: Mass versus weight
- Wikipedia: Pound (mass)
- Wikipedia: Stone (unit)
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