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Force Calculator (F = ma)

Solve Newton's second law for force, mass or acceleration — or find an object's weight.

  • Free
  • No sign-up
  • Nothing is sent or stored
Formula
kg
m/s²

Result

Force
3,000 N
Mass (m)
1,200 kg
Acceleration (a)
2.5 m/s²
Equivalent weight
305.915 kgf
How it was calculated
  1. F = m × a
  2. F = 3,000 N

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved.

How to use the Force Calculator (F = ma)

  1. Choose F = ma or weight.
  2. Pick what to solve for.
  3. Enter the known values and read the result in newtons.

What does this tool do?

Newton's second law says the net force on an object equals its mass times its acceleration. Pushing a 1,200 kg car to accelerate at 2.5 m/s² takes 3,000 N of net force.

Weight is the force of gravity on a mass: W = mg, with standard gravity g = 9.80665 m/s². A 70 kg person weighs about 686 N.

Why use it?

  • Solve for any variable.
  • Weight mode included.
  • Shows the formula.

The formula

F = m × a
W = m × g

Accuracy and limits

  • Values are in SI units (shown next to each field). Convert other units first, or use our unit converters.

Privacy

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.

Last reviewed by the M2Toolkit team.

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