Kilojoules to Calories Converter
1 kilojoule ≈ 239.005736 calories
This is the small calorie. The "Calorie" on food labels is a kilocalorie, which is 1,000 of these.
1 kilojoule equals 239.006 calories
How to convert kilojoules to calories
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
cal = kJ × 239.0057361One kilojoule is 239.0057361 calories, so a single multiplication converts any value.
2,390.06 cal ≈ 10 × 239.0057361This is the small calorie. The "Calorie" on food labels is a kilocalorie, which is 1,000 of these.
Kilojoules to calories conversion table
Common values in kilojoules, converted to calories.
| Kilojoules (kJ) | Calories (cal) |
|---|---|
| 1 | 239.00574 |
| 2 | 478.01147 |
| 3 | 717.01721 |
| 4 | 956.02294 |
| 5 | 1,195.0287 |
| 10 | 2,390.0574 |
| 20 | 4,780.1147 |
| 25 | 5,975.1434 |
| 50 | 11,950.287 |
| 100 | 23,900.574 |
| 250 | 59,751.434 |
| 500 | 119,502.87 |
| 1,000 | 239,005.74 |
About these units
kilojoulekJ
One thousand joules. The metric food-energy unit outside the United States.
caloriecal
The thermochemical calorie: exactly 4.184 joules.
Reference: NIST Special Publication 811.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.