Force Calculator

F = ma, in newtons, kilograms-force and pounds-force.

F = ma, in newtons, kilograms-force and pounds-force. Force is mass times acceleration.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Mass

Acceleration

m/s²

Gravity

m/s²

Standard gravity by definition. Local values run 9.78 to 9.83.

Force (newtons)

98.066

10 kgf · 22.05 lbf

Force98.066 N

In kilograms-force10

In pounds-force22.046

Mass10 kg

Weight under gravity98.066 N

F = ma. A newton is small — roughly the weight of a medium apple — which is why the same force reads as 98.1 N but only 10 kgf. Mass and weight are different quantities: your mass is the same on the Moon, your weight is a sixth.

How the Force Calculator works

Force is mass times acceleration. A newton is small — roughly the weight of a medium apple — so the same figure is also given in kilograms-force and pounds-force, which is how scales and specifications usually report it.

Also known as: f = ma calculator · newtons calculator · how to calculate force · force formula calculator

Where to go next

The Force question rarely arrives on its own. These are the ones that usually come with it:

Acceleration Calculator — Acceleration in m/s² and in g, which is the legible one.
Pressure Calculator — From a force on an area, or from a depth of fluid.
Work Calculator — W = Fd cos θ, including the case that comes out zero.
Speed Distance Time Calculator — Any one of the three from the other two, in four units.

Sources

Frequently asked questions

How do I calculate force?

Multiply mass by acceleration. 10 kg accelerating at 1 g weighs 98.07 newtons.

What is the difference between mass and weight?

Mass is how much matter there is; weight is the force gravity exerts on it. Your mass is unchanged on the Moon, your weight is about a sixth.

How many newtons is a kilogram?

A kilogram is not a force, but a kilogram-force (the weight of 1 kg under standard gravity) is 9.80665 newtons.

How do I convert newtons to pounds?

Multiply by 0.2248. So 100 N is 22.48 pounds-force.

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The one-line version

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