How to Convert Kilojoules to Calories (kJ to cal)
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU. This guide shows how to convert kilojoules into calories by hand, with examples and a quick-reference table.
The conversion
To convert kilojoules to calories, multiply the value by 239.0057361377. To go the other way, divide by the same number (or multiply by 0.004184). For a quick estimate, multiply by about 240.
Calories = kilojoules × 239.0057361377
Worked examples
- 3 kJ = 717.0172 cal
- 12.5 kJ = 2,987.57 cal
- 75 kJ = 17,925.43 cal
Kilojoules to Calories table
| Kilojoules | Calories |
|---|---|
| 1 kJ | 239.0057 cal |
| 2 kJ | 478.0115 cal |
| 5 kJ | 1,195.03 cal |
| 10 kJ | 2,390.06 cal |
| 20 kJ | 4,780.11 cal |
| 25 kJ | 5,975.14 cal |
| 50 kJ | 11,950.29 cal |
| 100 kJ | 23,900.57 cal |
| 250 kJ | 59,751.43 cal |
| 500 kJ | 119,502.87 cal |
| 1,000 kJ | 239,005.74 cal |
Common questions
Is kJ to cal exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Calories to Kilojoules converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Kilojoules to Calories Converter or browse all energy converters.
Run your own numbers: Kilojoules to Calories Converter