⚡ Energy Converter
Convert between joules, calories, kilowatt-hours, BTU, and electron volts.
1 J = 0.001 kJ
All Conversions
Joule
1 J
Kilojoule
0.001 kJ
Calorie
0.239006 cal
Kilocalorie
0.000239 kcal
Watt-hour
0.000278 Wh
Kilowatt-hour
2.7778e-7 kWh
BTU
0.000948 BTU
Electron Volt
6.2422e+18 eV
Frequently Asked Questions
How many calories are in a kilocalorie?
One kilocalorie (kcal) equals 1,000 calories. The 'calories' listed on food labels are actually kilocalories. A food item labeled as 200 Calories contains 200 kilocalories or 200,000 small calories.
What is a kilowatt-hour?
A kilowatt-hour (kWh) is a unit of energy equal to 3.6 million joules. It represents the energy consumed by a 1,000-watt appliance running for one hour. Electricity bills are typically measured in kWh.
How do you convert BTU to kilowatt-hours?
One BTU equals approximately 0.000293071 kWh. To convert BTU to kWh, divide by 3,412.14. For example, 10,000 BTU ≈ 2.93 kWh. BTU is commonly used for heating/cooling capacity in the US.