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Convert between joules, calories, kWh, and more.
Convert between joules, calories, kWh, BTU, and other energy units
1 Kilowatt-hours (kWh) =0.000000e+0 Joules (J)
Method: Convert to Joules (J) first, then to target unit
Formula: 1 × 3600000 ÷ 1 = 0.000000e+0
1 kWh = 3,600,000 joules
1 kWh = 3,412 BTU
1 calorie = 4.184 joules
1 kcal = 4,184 joules
1 BTU = 1,055.06 joules
1 Wh = 3,600 joules
1 kJ = 1,000 joules
1 BTU = 0.252 kcal
1 food Calorie (nutrition label): 1 kcal = 4,184 J
100-watt light bulb for 1 hour: 0.1 kWh = 360,000 J
Average home electricity usage per day: ~30 kWh
Energy in 1 gallon of gasoline: ~36.6 kWh = 131,760,000 J
Average smartphone battery: ~3,000 mAh at 3.7V ≈ 11.1 Wh
Energy is the capacity to do work. The SI unit is Joule (J). Different fields use different units: kWh for electricity, calories for food, and BTU for heating and cooling systems.
Note: Food "Calories" (with capital C) are actually kilocalories (kcal). 1 food Calorie = 1,000 small calories = 1 kcal.