Energy Converter
Joules, calories, kilowatt-hours, BTU
From unit
Joule
To unit
Kilojoule
Supported energy units
This converter supports 9 units. Each conversion is calculated using the standard SI definition where applicable.
- Joule (J)
- Kilojoule (kJ)
- Calorie (cal)
- Kilocalorie (kcal)
- Watt-hour (Wh)
- Kilowatt-hour (kWh)
- BTU (BTU)
- Electron Volt (eV)
- Foot-pound (ft·lb)
Popular energy conversions
Quick reference for the most-searched energy conversions.
- 1 kcal to kJ = 4.184 kJ
- 1 kWh to J = 3600000 J
- 1 BTU to J = 1055.06 J
- 1 cal to J = 4.184 J
Energy converter FAQ
- How many kilojoules are in 1 kilocalorie?
- 1 kilocalorie (kcal) equals 4.184 kilojoules (kJ).
- How many joules are in 1 kilowatt-hour?
- 1 kilowatt-hour (kWh) equals 3600000 joules (J).
- How many joules are in 1 btu?
- 1 btu (BTU) equals 1055.06 joules (J).
- How many joules are in 1 calorie?
- 1 calorie (cal) equals 4.184 joules (J).
- What is a energy converter?
- A energy converter instantly translates a value from one energy unit to another. Unit Guru supports 9 energy units, with the Joule (J) as the SI base unit.
- How accurate is the energy conversion?
- Every conversion uses the standard SI definition or the official conversion factor. Results are computed in your browser using double-precision arithmetic, so they're as accurate as the source units allow.
- Is the energy converter free?
- Yes — Unit Guru is 100% free with no ads, no signup, and no tracking. All conversions run client-side in your browser.