Calculate force, mass or acceleration using Newton's second law. Fill in two of the three fields and leave the third at 0, and the calculator works out the rest.
Newton's second law states that the force (F) acting on an object equals its mass (m) multiplied by the acceleration (a) it undergoes. Force is measured in newtons (N), where 1 N is the force that gives a mass of 1 kg an acceleration of 1 m/s².
If you know two of the three values, you can solve the equation for the third: m = F ÷ a to find mass, or a = F ÷ m to find acceleration.
Newton's second law describes the relationship between force, mass and acceleration: the force acting on an object equals its mass multiplied by its acceleration (F = m × a). The law is one of the cornerstones of classical mechanics.
Force is measured in newtons (N), named after Isaac Newton. One newton is defined as the force that gives a mass of one kilogram an acceleration of one meter per second squared.
The gravitational force on an object is proportional to its mass: double the mass and you double the gravitational force too (given the same gravitational acceleration).