Force Calculator (F = ma)
Compute force from mass and acceleration using Newton's second law.
Force (N)
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Force (lbf)
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Force (kgf)
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Mass (kg)
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Acceleration (m/s²)
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Results update as you type.
About this calculator
Newton's second law states that force equals mass times acceleration: F = m × a. The result is in newtons (N), where one newton accelerates one kilogram at one metre per second squared. The pound-force equivalent is also shown (1 N = 0.2248 lbf).
Frequently asked questions
What is Newton's second law?
It states that the net force on an object equals its mass times its acceleration, F = m × a. Doubling the mass or the acceleration doubles the force.
What is a newton?
A newton is the SI unit of force: the force that gives a 1 kg mass an acceleration of 1 m/s². It equals about 0.2248 pounds-force.
Results are estimates for general guidance only, not financial, medical or tax advice.