Kinetic Energy Calculator

Kinetic Energy is the energy an object has due to its motion:

KE = ½ × m × v²

Where:

• KE = Kinetic energy
• m = Mass of the object
• v = Velocity (speed) of the object

SI Units (metric):

• Mass in kilograms (kg)
• Velocity in meters per second (m/s)
• Energy in Joules (J)
• KE (J) = ½ × mass (kg) × velocity (m/s)²

Imperial Units:

• Mass in pounds (lb)
• Velocity in feet per second (ft/s)
• Energy in foot-pounds force (ft·lbf)
• KE (ft·lbf) = ½ × mass (lb) × velocity (ft/s)² / 32.174
• The division by 32.174 (g) converts from lb·ft²/s² to ft·lbf

Useful conversions:

• 1 Joule = 0.7376 ft·lbf
• 1 ft·lbf = 1.3558 Joules
• 1 m/s = 3.281 ft/s
• 1 kg = 2.205 lb

Examples:

• A 70 kg person running at 5 m/s: KE = 875 J
• A 0.145 kg baseball at 40 m/s: KE = 116 J
• A 1,500 kg car at 27 m/s (60 mph): KE = 546,750 J