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Force Calculator
Newton's second law links force, mass and acceleration. Enter any two to find the third.
Force Calculator
Newton's second law — F = ma — find force, mass, or acceleration
F = m × a | m = F/a | a = F/m
kg
m/s²
Force (F)
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Weight on Earth
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Force in kN
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Force in lbf
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Force in dyne
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Step-by-Step
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About the Force Calculator
Newton's second law links force, mass and acceleration. Enter any two to find the third.
How to use the Force Calculator
- Enter two of Mass (m), Acceleration (a) and Force (F).
- Press the matching button, such as Find Force (F), or Calculate.
Formula and method
F = m × a, so m = F ÷ a and a = F ÷ m. Force is in newtons (N).
Worked example
A 10 kg mass accelerating at 9.8 m/s² needs 98 N of force.
Tips
- Use kilograms and metres per second squared.
- This calculates the net force. Friction and other forces must be included.
Frequently asked questions
What is one newton?
The force that accelerates a 1 kg mass at 1 m/s².