Energy Converter
Kilowatt-hours, therms and British Thermal Units, alongside joules, calories and horsepower-hours.
"Energy is eternal delight." — from the steam engine's horsepower to the electric fluid of the modern grid, all reckoned in a single measure.
Numbers only.
Kilowatt-hours
1
Megajoules
3.6
British Thermal Units
3,412.14
Household & Fuel Measures
Kilowatt-hour (kWh)
1
Watt-hour (Wh)
1,000
Therm (thm)
0.034121
British Thermal Unit (Btu)
3,412.14
Kilocalorie (kcal)
859.845
Metric & Scientific
Joule (J)
3,600,000
Kilojoule (kJ)
3,600
Megajoule (MJ)
3.6
Calorie (cal)
859,845
Erg
3.6000e+13
Electronvolt (eV)
2.2469e+25
Mechanical & Industrial
Horsepower-hour (hph)
1.34102
Foot-pound (ft·lb)
2,655,220
Tonne of TNT
0.00086
British comparison:about one kilowatt-hour, a full load of washing
Thermal Conductivity
Not a quantity of energy but a rate of heat transfer through a material, so it is reckoned separately. Builders and insulation specifiers meet both units side by side.