Force Calculator (F=ma)
Newton’s second law — force, mass, acceleration
F = m × a
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Force calculator (F = ma)
Solve Newton's second law. Force, mass, or acceleration — any two give the third.
How to use this tool
- 1
Enter 2 of 3 values
Force, mass, or acceleration.
- 2
See the third
Computed via Newton’s second law.
- 3
Multi-unit output
N, lbf, kgf.
Frequently Asked Questions
Newton’s second law
F = m × a. Force equals mass times acceleration. 1 Newton accelerates 1 kg at 1 m/s².
Weight vs mass
Mass is amount of matter (kg). Weight is force from gravity: W = m × g. On Earth g ≈ 9.81 m/s². 1 kg → 9.81 N weight.
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