Energy conversions

Convert between energy units. Calories, kilojoules, kilowatt-hours and BTU. Each page gives the exact factor and where it comes from, a full table, a worked example, and the reverse conversion.

kcal to kj1 kcal = 4.184 kJ kj to kcal1 kJ = 0.239006 kcal cal to j1 cal = 4.184 J j to cal1 J = 0.239006 cal kwh to j1 kWh = 3,600,000 J kj to cal1 kJ = 239.0057 cal btu to kwh1 BTU = 0.000293071 kWh btu to j1 BTU = 1,055.0559 J kj to j1 kJ = 1,000 J kwh to kcal1 kWh = 860.4207 kcal wh to kwh1 Wh = 0.001 kWh kwh to wh1 kWh = 1,000 Wh