What unit is force measured in?

In SI units, force is measured in newtons. One newton equals 1 kg·m/s².

Can this solve for mass?

Yes. Select Mass and enter force and acceleration.

Is weight the same as force?

Weight is a force caused by gravity. Near Earth, weight is mass multiplied by about 9.81 m/s².

Why does acceleration need direction?

Force and acceleration are vectors. This simple calculator handles magnitudes; direction should be handled separately in vector problems.

Force Calculator

Solve force, mass, or acceleration using Newton's second law: F = m × a.

Solve for

Force

Mass

Acceleration

m/s²

Newton's Second Law Formula

F = m × a

Newton's second law states that net force equals mass multiplied by acceleration. The calculator can rearrange the formula to solve for force, mass, or acceleration.

Symbol	Variable	Description
F	Force	Net force measured in newtons (N).
m	Mass	Object mass measured in kilograms (kg).
a	Acceleration	Change in velocity per second, measured in m/s².

How to Use the Force Calculator

1
Choose the unknown
Select whether you want to solve force, mass, or acceleration.
2
Enter the two known values
Leave the unknown field disabled and enter SI-unit values in the other fields.
3
Read the result
The calculator returns the missing value using F = ma.

Common Force Calculator Examples

A 5 kg object accelerating at 3 m/s² has a net force of 15 N. If a 20 N net force acts on a 4 kg mass, acceleration is 5 m/s².

Net Force vs Applied Force

Newton's second law uses net force. If friction, tension, gravity, or normal force also act on the object, combine forces first before using the calculator.

SI Unit Checks

Use kilograms for mass and meters per second squared for acceleration. If mass is in grams, divide by 1000 before entering it.

Force Calculator FAQ

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