Kilojoules to Calories Converter
kJ → cal · ⚡ Energy
1 Kilojoules = 239.00574 Calories
How to convert Kilojoules to Calories
To convert Kilojoules to Calories, multiply the value in Kilojoules by 239.00574. For example, 5 kJ = 1,195.029 cal.
Converting Kilojoules (kJ) to Calories (cal) is a frequent need, and the exact relationship is 1 kJ = 239.00574 cal. Whether you're working on a project, checking a specification, or just curious, the calculator above gives you the answer instantly for any value you enter.
Energy conversions appear in nutrition, fitness, physics, utility bills, and engineering. The same quantity of energy can be expressed in joules, calories, kilowatt-hours, or BTU depending on the context.
Understanding Kilojoules and Calories
The joule is the SI unit, but everyday contexts use others: food labels use kilocalories (often just called 'calories'), electricity bills use kilowatt-hours, and heating and cooling systems use BTU (British Thermal Units). One food calorie is actually a kilocalorie — 1,000 of the small physics calories — which is a frequent source of confusion.
How accurate is this conversion?
Energy conversions use standard definitions: 1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1,055.06 joules. These are internationally agreed values, making the conversions exact.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Kilojoules to Calories values
The most frequently searched conversions are 1 Kilojoules = 239.00574 Calories, 5 Kilojoules = 1,195.029 Calories, 10 Kilojoules = 2,390.057 Calories, and 100 Kilojoules = 23,900.574 Calories. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: When comparing appliance efficiency or heating costs, convert everything to kilowatt-hours first, since that's the unit your utility bill uses — it makes the real-world cost immediately comparable.
Kilojoules to Calories — Conversion Table
| Kilojoules (kJ) | Calories (cal) |
|---|---|
| 0.1 kJ | 23.900574 cal |
| 0.25 kJ | 59.751434 cal |
| 0.5 kJ | 119.50287 cal |
| 1 kJ | 239.00574 cal |
| 2 kJ | 478.01147 cal |
| 5 kJ | 1,195.029 cal |
| 10 kJ | 2,390.057 cal |
| 25 kJ | 5,975.143 cal |
| 50 kJ | 11,950.287 cal |
| 100 kJ | 23,900.574 cal |
| 250 kJ | 59,751.434 cal |
| 500 kJ | 119,502.87 cal |
| 1000 kJ | 239,005.74 cal |