Striking Power Calculator

Only the portion of your body mass that's actually accelerating and moving with the strike contributes to its force — an arm-only punch might transfer only 10% of your body weight, while a well-rotated hip-and-shoulder strike can transfer up to roughly half of it. That's why a lighter fighter with excellent mass transfer technique can out-hit a heavier fighter throwing arm-only strikes, even at similar fist velocity.

Real punch and kick impact durations typically fall in a narrow 10-20 millisecond range regardless of the striker, since that's largely governed by the physical properties of tissue and bone compressing on contact rather than by technique. Using a representative fixed value in that range lets the calculator estimate force and power from inputs a fighter can actually provide, without requiring specialized lab equipment to measure contact time directly.

Kinetic energy describes the total amount of work the strike carries based on its mass and velocity, independent of how quickly that energy gets delivered. Peak power divides that same energy by impact duration, capturing how concentrated the delivery is — two strikes with identical kinetic energy but very different impact durations will produce noticeably different peak power and, correspondingly, different felt impact.

It can help, but force scales with mass just as directly as with velocity in this model, so a fighter with poor mass transfer technique hitting an elite velocity will still fall short of a fighter who combines solid velocity with a high effective mass ratio from proper hip rotation and weight transfer. Technique that improves mass transfer is often the more accessible lever than trying to swing faster alone.