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Force Calculator — Newton's Second Law

Force Calculator

Calculate force from mass and acceleration using Newton's second law.

Mass (kg)

Acceleration (m/s²)

How to Use

Enter mass in kg and acceleration in m/s². Click Calculate.

F = m × a. lbf = N × 0.2248. kgf = N / 9.81. kN = N / 1000.

100 kg at 9.81 m/s²: 981 N (220.5 lbf, 100 kgf).

What units should I use?

Mass in kilograms and acceleration in m/s² gives force in newtons (N).