What is weight on other planets?
Weight on other planets means the force gravity would put on the same body if it stood on another world. Your mass stays the same. Your weight changes because Mercury, Mars, Jupiter, and Pluto all pull with different strength. A 150 lb person on Earth would weigh about 56.7 lb on Mars and about 379.2 lb on Jupiter. Same person. Different pull. The everyday bathroom-scale version is what most people mean when they ask, “what would I weigh on Mars?” Physics teachers will point out that kilograms measure mass, not force. They are right. Bathroom scales still report kilograms in most countries, so this tool follows normal human language instead of turning a fun question into a courtroom deposition. The Weight on Other Planets calculator takes your Earth weight in kg or lb and multiplies it by each planet’s surface-gravity ratio.
How to use the Weight on Other Planets calculator
The tool is built for the 30-second version of the question. No spreadsheet. No NASA PDF. No Microsoft Excel formula hiding in cell F19. Open it, type your number, read the table.
- Enter your weight on Earth as a positive number. Decimals work, so 70.5 is fine.
- Choose kg or lb. The result stays in the same unit.
- Look at the Earth card first. It echoes your input and shows standard Earth gravity: 9.80665 m/s².
- Read the planet cards for Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
- Use the percentage under each result to understand the pull. Mars is about 37.8% of Earth. Jupiter is about 252.8%.
That is the whole flow. Big Software would rather hand you a workbook, a template gallery, and a tutorial video called “Build Your Planetary Weight Model.” This is just the weight on other planets calculator. Type 150, choose lb, leave happier than you arrived.
The formula behind planetary weight
The math is one multiplication per planet. The calculator uses surface gravity values from the NASA Planetary Fact Sheet. Earth uses standard gravity, 9.80665 m/s², so the Earth result matches your input exactly.
Weight on planet = Earth weight × (planet surface gravity ÷ Earth surface gravity)
The variables are plain. Earth weight is the number you type. Planet surface gravity is the acceleration due to gravity on that world, measured in meters per second squared. Earth surface gravity is 9.80665 m/s². Divide the planet’s gravity by Earth’s gravity and you get the multiplier.
Here is a worked example for Mars. Mars surface gravity is 3.71 m/s². Earth standard gravity is 9.80665 m/s². The Mars ratio is 3.71 ÷ 9.80665 = 0.3783147. If someone weighs 150 lb on Earth, their Mars scale reading is 150 × 0.3783147 = 56.7472 lb. The widget rounds that to 56.7 lb. If the same person entered 68.0 kg instead, the ratio would be the same: 68.0 × 0.3783147 = 25.7 kg.
This is why the unit toggle is simple. The calculator does not need to convert pounds to kilograms and back to get the planet ratios. Gravity ratios are unit-independent. Pounds in, pounds out. Kilograms in, kilograms out. The pull changes; the math does not get dramatic just because Jupiter is showing off.
Common planetary weight values
The fastest way to understand gravity on other planets is to compare the same Earth weight across the Solar System. The table below uses 150 lb on Earth. The percentages match the calculator’s display: planet gravity divided by Earth gravity, then multiplied by 100.
| World | Surface gravity | Earth-weight ratio | 150 lb becomes |
|---|---|---|---|
| Mercury | 3.70 m/s² | 37.7% | 56.6 lb |
| Venus | 8.87 m/s² | 90.4% | 135.7 lb |
| Earth | 9.80665 m/s² | 100.0% | 150.0 lb |
| Mars | 3.71 m/s² | 37.8% | 56.7 lb |
| Jupiter | 24.79 m/s² | 252.8% | 379.2 lb |
| Saturn | 10.44 m/s² | 106.5% | 159.7 lb |
| Uranus | 8.87 m/s² | 90.4% | 135.7 lb |
| Neptune | 11.15 m/s² | 113.7% | 170.5 lb |
| Pluto | 0.62 m/s² | 6.3% | 9.48 lb |
Mars and Mercury land near each other even though they are very different places. Venus and Uranus share the same surface gravity value in this dataset, so the calculator returns the same weight for both. Saturn surprises people. It is huge, but its surface-gravity ratio is only about 106.5% of Earth in this table, so a 150 lb person would read 159.7 lb there, not some cartoonish number.
Jupiter is the outlier. Its ratio is about 2.528× Earth, which is why a 150 lb Earth weight becomes 379.2 lb. Pluto sits at the other end. At 6.3% of Earth gravity, that same person gets a scale reading under 10 lb. Not useful for shopping for jeans, very useful for making a classroom wake up.
Edge cases and limitations
The Weight on Other Planets calculator accepts positive numbers up to 2,000,000 in kg or lb. It rejects zero, negative values, and non-numbers because “minus 40 lb on Neptune” is not a real physical situation. If the input looks wrong, start with the unit. Typing 70 while the toggle is set to lb gives a very different human than typing 70 kg.
The bigger limitation is language. In strict physics, weight is a force measured in newtons. Kilograms measure mass. Pounds can mean pound-mass or pound-force depending on context. Daily life is messier. A bathroom scale in Berlin says kg. A bathroom scale in Chicago says lb. This tool answers the scale-reading question, not a graduate mechanics exam.
Surface gravity is also not the same as “what happens if you stand on the planet.” You cannot stand on Jupiter, Saturn, Uranus, or Neptune the way you stand on a floor. They are gas or ice giants, not rocky sidewalks. The calculator uses published surface-gravity reference values anyway because that is the standard way to compare planetary weight. It is a comparison, not travel advice. Please do not pack boots for Jupiter.
Related calculations
If this question started as space curiosity, try Age on Other Planets next. It converts your Earth age into Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto years using orbital periods instead of gravity.
If the kg-versus-lb part is what you need, use the Weight Converter or the broader Unit Converter. They handle normal Earth units without asking anyone to think about Neptune before breakfast. For the physics-strict version of mass, density, and volume, the Mass Calculator is the better sibling.
Microapp’s job is to keep these small jobs small. Microsoft Excel can do planetary weight if you build the table yourself. Google Sheets can too. ChatGPT might even give you the right ratios if it does not wander off into sci-fi. The point here is simpler: one focused tool, correct math, no account, no 14-day trial wearing a lab coat.
Frequently asked questions
What would I weigh on Mars?
Multiply your Earth weight by 0.3783147. A 150 lb person would weigh 56.7 lb on Mars. A 70 kg person would weigh 26.5 kg. The Weight on Other Planets calculator does that multiplication for you and rounds the result for display.
Why is my weight different on each planet?
Your weight changes because each planet has a different surface gravity. Weight is the gravitational pull on your mass. Your mass does not change when you move from Earth to Mars, but the pull does, so the scale reading changes.
Does the calculator include the Moon?
No. This version covers Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto, with Earth shown as the reference. The Moon is not included in the current planet grid. If you need a lunar comparison, use the same formula with the Moon’s gravity: about 1.62 m/s².
Why is Pluto included if it is not a planet?
Pluto is included because people still search for weight on Pluto and because it is fun. The tool labels Pluto as a dwarf planet in the result card. The math works the same way: Pluto’s surface gravity divided by Earth gravity gives the multiplier.
Is weight on other planets the same as mass?
No. Mass is how much matter you have. Weight is how strongly gravity pulls on that mass. In everyday scale language, people use kg and lb for weight, so the calculator uses those familiar units while keeping the gravity ratio correct.
Where do the gravity numbers come from?
The surface-gravity values come from the NASA Planetary Fact Sheet. Earth uses the standard gravity value 9.80665 m/s² so your Earth result equals the number you entered. The other worlds use their listed equatorial surface-gravity values.
Can I use the weight on other planets calculator for objects, not people?
Yes. Enter the Earth weight of a backpack, rover, dumbbell, or blue whale if you want. The formula only needs an Earth weight and a gravity ratio. Keep the number positive and under the tool’s 2,000,000-unit limit.