Energy Converter
Work & heat - joules, calories, kilowatt-hours.
Enter a value above to convert between kWh and BTU.
How to convert energy units
Energy is based on the joule. One calorie is 4.184 J - and the "Calorie" on food labels is actually a kilocalorie, equal to 4,184 J. One watt-hour is 3,600 J, so one kilowatt-hour is 3,600,000 J. One BTU is 1055.05585 J.
Worked example
One kilowatt-hour is 3,600,000 J. A 2,000-kcal daily diet is 2000 × 4184 = 8,368,000 J ≈ 2.32 kWh. One BTU is 1055.06 J.
How many joules are in a kilowatt-hour?
One kilowatt-hour equals 3,600,000 joules. One watt-hour equals 3,600 J, one food kilocalorie equals 4,184 J, one calorie equals 4.184 J, and one BTU equals 1055.05585 J.
When you'll use an energy converter
Energy conversion is useful for nutrition (kilocalories and kilojoules), electricity bills (kilowatt-hours), heating and cooling (BTU), and physics or engineering (joules, electronvolts). The table above lists your value in all 8 supported units at once.