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Force Calculator (F = ma, Newton’s 2nd Law)

Calculate force, mass or acceleration using Newton’s second law F = ma – plus weight (W = mg) – with unit conversions for N, kN, kgf and lbf.

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Enter values

What is the Force Calculator?

Newton’s second law says the net force on an object equals its mass times its acceleration: F = m × a. Choose which quantity you want, enter the other two and get the answer in newtons (and kN, kgf, lbf). Weight is a special case: W = m × g.

How to use the Force Calculator

  1. Choose force, mass or acceleration.
  2. Enter the other two values in SI units (kg, m/s², N).
  3. See conversions and the weight of the mass.

Units

1 N = 1 kg·m/s² · 1 kgf = 9.80665 N · 1 lbf = 4.448 N.

This Force Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.

Last updated: · By NodifyTech