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Force and weight calculator
Calculate force from mass and acceleration (F = m·a) and see what your weight would be on the Moon, Mars, Jupiter and the other planets. Free, in your browser, and the table updates as you type.
How to calculate force and weight
- 1Enter a mass in kilograms
- 2Change the acceleration if you need to (9.81 m/s² is Earth)
- 3Read the force and the planet table
- A force in newtons and your weight on nine worlds.
What you get
- Force in newtons.The big number is mass times acceleration, shown in N.
- Nine worlds at once.Mercury to Neptune, plus the Moon and Earth, in one table.
- Nothing is uploaded.The numbers are worked out in your browser and not sent anywhere.
What you can do
- Calculate force with F = m·a from a mass in kilograms and an acceleration in m/s².
- See the weight in newtons on Earth, the Moon, Mars, Venus, Mercury, Jupiter, Saturn, Uranus and Neptune.
- Read the "feels like" column: the mass on Earth that would give the same weight, so Jupiter shows your weight as if you were much heavier.
- Start with 70 kg and 9.81 m/s², so a result is shown right away.
Good to know
- Mass stays the same everywhere. Only the weight, the force of gravity on that mass, changes from planet to planet.
- The planet table uses surface gravity (for example 1.62 m/s² for the Moon and 24.79 m/s² for Jupiter). Jupiter, Saturn, Uranus and Neptune have no solid surface, so those rows are for the gravity at the cloud tops.
- Both fields must hold a number, or the result stays empty.
Questions
What is the formula for force?
Force equals mass times acceleration, F = m·a. One kilogram accelerated at 1 m/s² needs one newton.
How much would I weigh on the Moon?
About one sixth of your Earth weight. Enter your mass and look at the Moon row in the table.
Is weight the same as mass?
No. Mass is how much matter you are made of, in kg. Weight is the force gravity puts on it, in newtons.
Do I need to sign up?
No. It is free and runs in your browser.