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Energy converter

Pick any two energy units. Food labels, electricity bills, heating and physics each use their own.

4.184

1 kcal = 4.184 kJkJ = kcal × 4.184 · shown to 6 significant figures

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Popular conversions

Joules to caloriesTier 01 joule = 0.2390057361 calories. Type in either box; the other updates as you go.Joules to electronvoltsTier 01 joule = 6.241509074 × 10^18 electronvolts. Type in either box; the other updates as you go.Kilocalories to kilojoulesTier 01 kilocalorie = 4.184 kilojoules exactly. Type in either box; the other updates as you go.Kilojoules to kilocaloriesTier 01 kilojoule = 0.2390057361 kilocalories. Type in either box; the other updates as you go.Electronvolts to joulesTier 01 electronvolt = 1.602176634 × 10^-19 joules exactly. Type in either box; the other updates as you go.BTU to kilowatt-hoursTier 01 British thermal unit = 0.0002930710702 kilowatt-hours. Type in either box; the other updates as you go.Calories to joulesTier 01 calorie = 4.184 joules exactly. Type in either box; the other updates as you go.Kilowatt-hours to BTUTier 01 kilowatt-hour = 3,412.141633 BTU. Type in either box; the other updates as you go.Kilowatt-hours to joulesTier 01 kilowatt-hour = 3,600,000 joules exactly. Type in either box; the other updates as you go.

Energy shows up under many names. Nutrition labels count kilocalories (shown as "Calories") or kilojoules, electricity bills count kilowatt-hours, heaters and air conditioners are rated in BTU, and physicists use joules and electronvolts. All of them are fixed multiples of the joule, the SI unit: the thermochemical calorie is exactly 4.184 J and a kilowatt-hour is exactly 3.6 million joules.

Use the converter above for any pair. The most searched pairs have their own pages with worked examples and reference tables, listed above.