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Kinetic energy from mass and velocity
About this calculator
Kinetic energy is the energy of motion, and this calculator finds it from mass and velocity. Enter an object's mass and speed in your preferred units ā kilograms, grams, pounds, metres per second, or kilometres per hour ā and get the energy in joules, plus comparisons that make the number tangible.
Kinetic energy equals one-half times mass times velocity squared. The squaring is the key insight: doubling speed quadruples the energy, which is why a car crash at 100 km/h is four times as violent as at 50, not twice.
Tip: Whenever speed changes, energy changes with the square ā so small speed cuts pay off hugely in crash safety, sports, and fuel use.