Force Calculator (F = ma)

This calculator applies Newton's Second Law of Motion, F = ma, to solve for any one of the three variables when you know the other two. Force is the product of an object's mass and its acceleration, measured in Newtons (N). One Newton is the force required to accelerate one kilogram of mass at one metre per second squared. When you select Solve for Force, you enter mass in kilograms and acceleration in m/s squared, and the calculator returns the force in Newtons, kilonewtons, and kilogram-force for reference. When you select Solve for Mass, you enter force in Newtons and acceleration in m/s squared, and the calculator tells you the mass in kilograms and tonnes. When you select Solve for Acceleration, you enter force in Newtons and mass in kilograms, and the calculator returns the acceleration in m/s squared. A common use is finding the weight force of an object: set the acceleration to g = 9.81 m/s squared and the mass to your object's mass to get its weight in Newtons. This tool is useful for physics students, mechanical engineers sizing motors and actuators, and anyone working through dynamics problems. The formula applies to the net force on a rigid body in a single direction; it does not account for friction, drag, or multiple forces acting simultaneously.

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