Select Source Unit British Thermal Units (BTU) Calories Electronvolts (eV) Ergs Foot-Pounds Joules Kilocalories Kilojoules Kilowatt-Hours (kWh) Megajoules Newton-Meters Therms Watt-Hours Watt-Seconds Select Target Unit British Thermal Units (BTU) Calories Electronvolts (eV) Ergs Foot-Pounds Joules Kilocalories Kilojoules Kilowatt-Hours (kWh) Megajoules Newton-Meters Therms Watt-Hours Watt-Seconds Convert