Mass Calculator
Enter weight (force) and gravitational acceleration to compute mass via m = W/g.
Input Data
Results
At a glance:Mass m is an intrinsic property measuring the amount of matter and resistance to acceleration (inertia). Weight W is the gravitational force on the mass: W = m·g. On Earth g ≈ 9.81 m/s², so a 1 kg mass weighs about 9.81 N. To find mass from weight use m = W/g. Mass stays constant everywhere, while weight changes with local gravity (e.g. it is about 1/6 on the Moon).
Formula
Weight: W = m·g
Mass from weight: m = W/g
How to Use
- Enter the weight W (N).
- Enter the gravitational acceleration g (m/s²).
- The calculator returns the mass m (kg).
Case Studies
Mass of a 98.1 N object
W = 98.1 N, g = 9.81 m/s².
m = 98.1/9.81 = 10 kg.
Its weight on the Moon would be about 16.4 N (g≈1.62).
FAQ
What is the difference between mass and weight?
Mass is the amount of matter and is constant everywhere; weight is the gravitational force W = m·g and changes with local gravity. On the Moon your mass is unchanged but your weight is about one sixth of Earth's.
Why use 9.81 m/s²?
That is the standard gravitational acceleration at Earth's surface. Use other values for different planets or altitudes.
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References
Content review: Calculatorism Physics Team. Results are for reference only; please refer to the relevant authorities for the official figures.