Weight on Other Planets Calculator

Weight on Other Planets Calculator converts your Earth weight in kg or pounds to Mars, Jupiter, the Moon and 7 other worlds, with the force in newtons and your jump height on each.

Weight on Other Planets Calculator in kg and Pounds

Your weight depends on the world under your feet. A bathroom scale reads the pull of gravity on your body, and that pull is different on every planet and moon. Your body and its mass stay exactly the same on all of them.

The Weight on Other Planets Calculator takes the weight your scale shows on Earth in kilograms, pounds or stone. You then pick one of ten worlds from the Planet or Moon menu. The list has the seven other planets, the Moon, Pluto and Jupiter’s moon Ganymede.

The starting entries are 70 kg and Mars. The main result reads 26.62 kg on Mars, which is 70 kg times 0.3804. The cards below it show the same answer as a force of 261.1 N and as a scale reading of 58.7 lb.

A second card shows how much lighter or heavier you are, here 43.38 kg lighter and 38.04% of your Earth weight. A third card turns your Earth jump into a jump on the chosen world. The last card of the Weight on Other Planets Calculator lists your weight on the Moon, Jupiter and Venus.

How to Calculate Weight on Another Planet

To calculate weight on another planet, multiply your Earth weight by the ratio of the two surface gravities. The planet’s surface gravity goes on top and Earth’s goes underneath. Earth’s standard value is 9.80665 m/s², the figure NIST lists as the standard acceleration of gravity.

$$W_{planet} = W_{earth} \times \frac{g_{planet}}{g_{earth}}$$

The answer comes out in the unit you started with. Enter kilograms and the result is in kilograms. Enter pounds and the result is in pounds. The ratio itself has no unit, so one multiplier works for kg, lb and stone.

Physics measures weight as a force in newtons. That force is your mass in kilograms times the local gravity. A 70 kg person presses down with 686.5 N on Earth and with 70 × 3.73 = 261.1 N on Mars. The kg to Newtons Calculator makes the same conversion for Earth.

$$F = m \times g$$

Surface gravity comes from the planet’s mass M and its radius r. A heavier planet pulls harder, and a wider planet puts you farther from its center. Mars has a mass of 6.4169 × 10²³ kg and a mean radius of 3,389.5 km, which gives 3.73 m/s².

$$g = \frac{G M}{r^{2}}$$

The Gravitational Force Calculator works with this law for any two masses. The Step-by-Step Working panel in the Weight on Other Planets Calculator shows the gravity ratio first. It then shows the scale reading, the force in newtons and the jump height.

Earth Weight to Mars Weight Formula

Mars has a surface gravity of 3.73 m/s², so the ratio is 3.73 ÷ 9.80665 = 0.3804. The Earth weight to Mars weight formula is your Earth weight times 0.3804. A 75 kg person would weigh 28.53 kg on Mars, and a 150 lb person would weigh 57.05 lb.

$$W_{mars} = 0.3804 \times W_{earth}$$

A 1 kg bag of sugar would read 0.3804 kg on a Mars scale, or about 380 g. It still holds 1 kg of sugar. Only the pull on it has dropped, to 3.73 N from the 9.807 N it feels on Earth.

Weight on the Moon and Back to Earth

The Moon’s surface gravity is 1.62 m/s², which is 0.1652 of Earth’s. Choosing The Moon turns the Weight on Other Planets Calculator into a weight on Moon calculator. A 70 kg person weighs 11.56 kg there, with a force of 113.4 N. A 1 kg object reads 0.1652 kg, close to one sixth.

To go from Moon weight to Earth weight, divide by 0.1652. That is the same as multiplying by 6.053. A scale reading of 20 kg on the Moon belongs to a person who weighs 121.1 kg on Earth.

$$W_{earth} = \frac{W_{moon}}{0.1652}$$

Weight on Each Planet for 70 kg and 150 lb

The table lists every world in the Weight on Other Planets Calculator with the surface gravity it uses. The multiplier column is that gravity divided by 9.80665. The last three columns apply it to a 70 kg person and a 150 lb person.

Students filling in a “calculate your weight on other planets” worksheet can use the multiplier column directly. Multiply the Earth weight by the multiplier for each row. The tool’s Weight on Every World panel builds the same list for whatever weight you enter.

Two planets on the list make you heavier, Jupiter and Neptune. Venus, Saturn and Uranus bring you to about nine tenths of your Earth weight. Mercury and Mars are close to each other at 38%, even though Mars is the larger planet.

How Much Would I Weigh on Jupiter, Saturn or Venus?

Jupiter has the strongest gravity of any planet in the solar system. You would weigh 2.358 times your Earth weight at its equator. A 70 kg person would read 165 kg, and a 150 lb person would read 353.6 lb. The weight force on that 70 kg body is 1,618 N.

Other sites give Jupiter multipliers from 2.34 to 2.53, and the gap has a real cause. Jupiter spins once in under ten hours, which throws you outward at the equator. The NASA Jupiter Fact Sheet lists 24.79 m/s² from mass alone and 23.12 m/s² with the spin included.

The Weight on Other Planets Calculator uses the 23.12 m/s² equator figure, since that is what a scale would feel. At Jupiter’s poles the value rises to 27.01 m/s². The same 70 kg person would read 192.8 kg there. A note under the result gives both figures for each giant planet.

Saturn is the surprise on the list. It holds 95.16 times the mass of Earth, so Saturn is far heavier than our planet. Its radius is so large that the equator gravity is only 8.96 m/s². A 70 kg person would weigh 63.96 kg there, a little less than at home.

Saturn also spins fast and bulges at the middle. The NASA Saturn Fact Sheet gives 12.14 m/s² at the poles, where 70 kg would read 86.66 kg. Sites that quote a Saturn multiplier of 1.06 are using a value between those two ends.

Venus has a surface gravity of 8.87 m/s², or 90.45% of Earth’s. A 70 kg person would weigh 63.31 kg, and a 150 lb person would weigh 135.7 lb. Venus is the closest match to Earth in size, with a diameter of 12,104 km against 12,756 km.

No other planet has exactly 100% of Earth’s gravity. Earth is the reference, so it sits at 100% by definition. Saturn’s equator at 91.37% and Venus at 90.45% come nearest from below. Neptune comes nearest from above at 112.2%.

Mass, Weight and the Jump Card

Mass is the amount of matter in your body, measured in kilograms. Weight is the force that gravity puts on that mass. A trip to Mars changes the force and leaves the mass alone. The alert under the result, Your Mass Stays the Same, makes this point for the rocky worlds.

A bathroom scale measures the push between your feet and its platform. It then divides by Earth’s gravity to print kilograms. On Mars the push is smaller, so the same scale prints a smaller number. The Normal Force Calculator finds that push on flat ground or on a slope.

Your legs would still launch you at the same speed on another world. Lower gravity then takes longer to stop you, so you rise higher. The jump height is your Earth jump divided by the gravity ratio. A 50 cm jump on Earth becomes 131.5 cm on Mars, with 1.679 s in the air.

$$h_{planet} = h_{earth} \times \frac{g_{earth}}{g_{planet}}$$

The same 50 cm jump reaches 302.7 cm on the Moon and lasts 3.866 s. On Jupiter it shrinks to 21.21 cm. The card also times a 1 m drop, which takes 0.7323 s on Mars against 0.4516 s on Earth. The Free Fall Calculator covers longer drops.

The force behind each reading follows Newton’s second law, with gravity as the acceleration. The Newton’s Second Law Calculator solves that equation for any mass. Entering 70 kg and 3.73 m/s² there returns the same 261.1 N shown on the first card.

Where Is Gravity Weakest on Earth?

Your weight changes slightly across Earth too. The NASA Earth Fact Sheet lists 9.780 m/s² at the equator and 9.832 m/s² at the poles. The spin of the planet and its wider middle both reduce the pull at the equator.

That difference is about 0.53%. A person who reads exactly 70 kg under standard gravity would read 69.81 kg at the equator and 70.18 kg at a pole. You are heavier at the poles by roughly the weight of a large apple.

Height matters as well, because a mountain top is farther from Earth’s center. A 2013 study in Geophysical Research Letters placed the weakest surface gravity on Mount Huascarán in Peru, at about 9.7639 m/s². The 70 kg person would read 69.69 kg on that summit.

NASA Weight on Other Planets Data

Every gravity value in the Weight on Other Planets Calculator matches a NASA figure. The planets, the Moon and Pluto come from the NASA Planetary Fact Sheet and its single-planet sheets. The gas and ice giants use the equator value at the 1 bar pressure level.

NASA’s satellite sheet gives Ganymede a mass of 1.4819 × 10²³ kg and a mean radius of 2,631.2 km. Putting those into the gravity formula gives 1.43 m/s². Ganymede is the largest moon in the solar system, yet a 70 kg person would weigh only 10.21 kg on it.

Pluto is still on the list, although it is no longer counted as a planet. The International Astronomical Union reclassified it as a dwarf planet in 2006. NASA’s Pluto page explains that it has not cleared other objects from its orbit. Its gravity is 0.62 m/s², so 70 kg reads 4.426 kg.

More Questions About the Planets

Smallest, Biggest and Gassiest Planets

Mercury is the smallest planet, with a diameter of 4,879 km. The three biggest by diameter are Jupiter at 142,984 km, Saturn at 120,536 km and Uranus at 51,118 km. Neptune is slightly narrower than Uranus but has more mass, so it ranks third by mass.

Jupiter is the gassiest planet in total amount. Its atmosphere is 89.8% hydrogen and 10.2% helium by volume. Saturn is the least dense, at 687 kg per cubic meter. That is lighter than water, so Saturn would float in a large enough ocean.

Is Saturn Hotter Than Earth, and Does It Have Oxygen?

Saturn is far colder than Earth. NASA gives a temperature of 134 K, or −139 °C, at the 1 bar level in its atmosphere. Earth averages about 15 °C. Saturn’s atmosphere is 96.3% hydrogen and 3.25% helium, and NASA’s composition list has no free oxygen in it.

Why Humans Cannot Visit Jupiter

Jupiter has no ground to land on. NASA’s Jupiter page says the pressures and temperatures deep inside crush, melt and vaporize spacecraft. Its magnetic field also traps charged particles, and the radiation near the planet can damage spacecraft.

Why It Cannot Rain on Mars

Rain needs liquid water, and Mars cannot keep water liquid at its surface. The air pressure there averages 6.36 millibars, under 1% of Earth’s. NASA’s Mars page says the atmosphere is too thin for liquid water to exist for long on the surface.

Mars is called a dead planet for related reasons. It has no global magnetic field today, and its rivers and lakes dried up long ago. NASA scientists do not expect to find living things thriving there now. Their rovers look for signs of life from the distant past.

Earth’s Sister Planet and Planets Without Life

Venus is often called Earth’s sister or twin, because the two are close in size and structure. The likeness ends at the surface. Venus averages 464 °C under a pressure of 92 bar, which makes it the hottest planet in the solar system.

Earth is the only planet where life has been found. No other planet has a measured chance of life, so figures such as 99.7% or 100% do not come from any space agency. NASA describes Jupiter and Saturn as not conducive to life as we know it.

Earth 1% Closer to the Sun, and the Far Future

Earth already moves more than 1% closer to the Sun every year. Its distance runs from 147.1 million km in January to 152.1 million km in July. A permanent shift of 1% would raise the sunlight reaching Earth by about 2%. It would not change your weight.

No year is set for the end of the Earth. Astronomers expect the Sun to swell into a red giant in roughly 5 billion years, which would end life here long before the planet itself is gone. Gravity at the surface will stay near 9.8 m/s² for all of that time.

The Weight on Other Planets Calculator is one of the Dynamics and Statics Calculators. The Force Calculator in the same group handles any mass and acceleration, including the gravity of worlds not listed here.