Weight on Other Planets Calculator

Enter your weight on Earth, pick a destination world, and see what you would weigh there using W = m × g and that world's real surface gravity.

Quick Facts

Core formula
W = m × g
Weight equals mass times local surface gravity — your mass never changes, but g does.
Gravity formula
g = GM / R²
Surface gravity depends on a world's mass (M) and radius (R), not mass alone.
Strongest & weakest
Jupiter 2.53× · Pluto 0.06×
Relative to Earth's standard gravity, g = 9.80665 m/s².

Your Results

Calculated
Weight on Selected World
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W = your mass × that world's surface gravity
Surface Gravity There
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In meters per second squared (m/s²)
Gravity Ratio vs. Earth
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g(world) ÷ g(Earth); Earth = 1.00×
Your Mass (Unchanged)
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Mass is the same everywhere in the solar system

Ready

Enter your Earth weight, pick a world, then press Calculate.

About the Weight on Other Planets Calculator

Your weight changes depending on which world you are standing on, even though your mass stays exactly the same. Weight is a force — how hard gravity pulls on your mass — and it is calculated as W = m × g, where m is your mass and g is the local surface gravity. This calculator takes the weight you enter for Earth, works out your unchanging mass, and then multiplies that mass by the real surface gravity of the world you choose to find out what you would weigh there.

Understanding the formula

Surface gravity itself comes from Newton's law of universal gravitation: g = GM / R², where G is the gravitational constant (6.674 × 10⁻¹¹ N·m²/kg²), M is the planet's mass, and R is its radius. A more massive planet pulls harder, but a larger radius spreads that pull over a bigger sphere and weakens it at the surface — which is why Jupiter, despite being about 318 times more massive than Earth, has only around 2.53 times Earth's surface gravity. Instead of recomputing g = GM/R² from raw mass and radius, this calculator uses each planet's published surface gravity (in m/s²), forms the ratio g_other ÷ g_earth, and applies it to your mass: W_other = m × g_other = W_earth × (g_other ÷ g_earth).

Working with units

  • Enter your Earth weight in pounds (lbf), kilograms (used colloquially as a weight unit), or newtons (the SI unit of force) — the result is returned in the same unit.
  • Behind the scenes, the calculator converts your entry to a force in newtons using standard gravity (g = 9.80665 m/s²) and 1 lbf = 4.4482216153 N, then recovers your invariant mass in kilograms.
  • That mass is multiplied by the destination world's surface gravity to get your weight there, then converted back to whichever unit you entered.

Knowing the limits

The gas giants — Jupiter, Saturn, Uranus, and Neptune — have no solid surface, so their listed "surface gravity" is a standard reference value taken at the level where atmospheric pressure equals 1 bar, not a place you could actually stand. Published surface gravity figures are also equatorial averages; a fast-spinning, oblate planet like Jupiter or Saturn has measurably lower gravity at its equator than at its poles because of centrifugal effects, so treat results here as solar-system-scale estimates rather than a precise value for one exact location.

Frequently Asked Questions

Why do I weigh a different amount on other planets?
Weight is a force equal to mass times the local acceleration due to gravity (W = m × g). Your mass — the amount of matter in your body — never changes, but each planet has its own surface gravity because g = GM/R² depends on that world's mass (M) and radius (R). A world with much stronger gravity, like Jupiter, makes you weigh more; a world with weaker gravity, like Pluto, makes you weigh far less.
What formula does this calculator use?
It converts your entered weight to a mass using Earth's standard gravity (g = 9.80665 m/s²), then applies W_other = mass × g_other, where g_other is the target world's real surface gravity in m/s². This is equivalent to the simpler ratio form W_other = W_earth × (g_other ÷ g_earth).
Why isn't Jupiter's gravity 318 times stronger than Earth's, since it's 318 times more massive?
Surface gravity depends on both mass and radius: g = GM/R². Jupiter is about 318 times more massive than Earth, but it is also roughly 11 times wider, and that radius is squared in the denominator. The two effects combine to give Jupiter a surface gravity of about 24.79 m/s², only around 2.53 times Earth's — not 318 times.
Do gas giants like Jupiter and Saturn really have a "surface" to stand on?
No. Jupiter, Saturn, Uranus, and Neptune have no solid surface — they are giant balls of gas and liquid. The "surface gravity" listed for these planets is a standard reference value calculated at the level where atmospheric pressure equals 1 bar (roughly Earth sea-level pressure), which is the convention used by NASA and other space agencies for comparison purposes.

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