Home / Energy
Energy equations
Calculate kinetic energy, work done and power.
Kinetic energy
kinetic energy = ½ × mass × speed²
Energy is measured in joules (J), mass in kilograms (kg), and speed in m/s.
Work done
work done = force × distance
Work done is measured in joules (J), force in newtons (N), and distance in metres (m), in the direction of the force.
Power
power = energy transferred ÷ time
Power is measured in watts (W), energy in joules (J), and time in seconds (s).
Calculate an answer
Choose an equation, select the value to find, and fill in the values you know.
Your answer
Your answer and working will appear here.