What is the formula of force?

Force is essentially a push, or pull on an object with mass which lead to change the velocity of the object.

For example, gravitational force, frictional force, etc.

Formula of Force is given by Newton's 2nd law of motion, which is, "force is the product of mass and acceleration".

It is given as-

$F=m\times a$, where, F = Force, m = mass and a = acceleration

F ∝ a (Force is directly proportional to acceleration)

F ∝ m (Force is directly proportional to mass)