» Newton's Second Law of Motion


Newton's second law calculator (F = m × a): calculate force, mass, or acceleration online with unit conversion for physics and engineering problems.

Newton's second law formula

$$\vec{F} = m \times \vec{a}$$

SI units for Newton's second law

Variable Symbol SI Unit
Force F newton (N)
Mass / Weight m kilograms (kg)
Acceleration a metres per second squared (m/s²)

Initial Data


Newton's Second Law Calculator FAQ

What is Newton's second law of motion?
Newton's second law links force, mass, and acceleration: F = m × a. If two values are known, the third can be calculated.

What can this calculator find?
This calculator can find force, mass, or acceleration. Select one value to find, then enter the other two values.

Can I use different units?
Yes. You can choose units for force, mass, and acceleration. The calculator converts units before and after calculation.

Which formulas are used?
The calculator uses F = m × a, m = F / a, and a = F / m, based on which value you choose to calculate.



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