Unit Kit
Free Energy Converter — Joules, Calories, KWh & BTU
Convert between 8 energy units including joule, kilojoule, calorie, kilocalorie, watt-hour, kilowatt-hour, BTU, and foot-pound. Instant results, no sign-up.
FAQ
What energy units are supported?
8 units: joule (J), kilojoule (kJ), calorie (cal), kilocalorie (kcal), watt-hour (Wh), kilowatt-hour (kWh), BTU, and foot-pound (ft·lb).
How do I convert kWh to joules?
Multiply kWh by 3,600,000. For example, 1 kWh = 3,600,000 J = 3.6 MJ.
What is the difference between a calorie and a kilocalorie?
1 kilocalorie (kcal) = 1000 calories (cal). Food calories are actually kilocalories.
How many joules are in 1 BTU?
1 BTU (British Thermal Unit) equals approximately 1,055.06 joules.
What is energy measured in for electricity bills?
Electricity is billed in kilowatt-hours (kWh). 1 kWh = 3.6 million joules.