Science · free · no sign-up
Weight Calculator
Find your weight, which is the force of gravity on your mass, on Earth and on other planets and the Moon.
Weight Calculator
W = m × g — weight, force, and planetary gravity converter
W = m × g | g(Earth) = 9.80665 m/s²
Weight on Earth
—
In Newtons
—
In kN
—
In lbf
—
In dyne
—
Mass (kg)
—
Mass (lb)
—
Weight on Other Planets (N)
Mercury
—
Venus
—
Moon
—
Mars
—
Jupiter
—
Saturn
—
Uranus
—
Neptune
—
Weight is gravity's pull on a mass, which is why the same object weighs less on the Moon and more on Jupiter without changing at all. This calculator computes weight from mass for Earth or any gravitational field you enter.
How to use this calculator
- Enter the mass in kilograms.
- Choose the location (Earth, Moon, Mars, Jupiter) or enter a custom gravity value.
- Press calculate to see the weight in newtons (and its everyday equivalent).
Your scales are quietly converting
Bathroom scales measure force (weight) and then display it as if it were mass, assuming Earth's gravity. Take them to the Moon and they would under-report your "kilograms" sixfold, not because you changed, but because their hidden assumption did. This calculator makes that assumption yours to set.
Frequently asked questions
What is the weight formula?
W = m × g: weight (newtons) = mass (kg) × gravitational acceleration (about 9.81 m/s² on Earth, 1.62 on the Moon).
What is the difference between mass and weight?
Mass is the amount of matter and never changes with location; weight is the gravitational force on that mass and changes with the planet.
How much would a 70 kg person weigh on the Moon?
About 70 × 1.62 = 113 newtons, roughly one sixth of their Earth weight of about 687 newtons.