1 joule is 0.2390 calories, so 1,000 J (1 kJ) is 239.0 cal, or about 0.24 food Calories.
| Joules (J) | Calories (cal) |
|---|---|
| 10 | 2.39 |
| 20 | 4.78 |
| 30 | 7.17 |
| 40 | 9.56 |
| 50 | 11.95 |
| 60 | 14.34 |
| 70 | 16.73 |
| 80 | 19.12 |
| 90 | 21.51 |
| 100 | 23.90 |
| 110 | 26.29 |
| 120 | 28.68 |
| 130 | 31.07 |
| 140 | 33.46 |
| 150 | 35.85 |
| 160 | 38.24 |
| 170 | 40.63 |
| 180 | 43.02 |
| 190 | 45.41 |
| 200 | 47.80 |
| 210 | 50.19 |
| 220 | 52.58 |
| 230 | 54.97 |
| 240 | 57.36 |
| 250 | 59.75 |
| 260 | 62.14 |
| 270 | 64.53 |
| 280 | 66.92 |
| 290 | 69.31 |
| 300 | 71.70 |
| 310 | 74.09 |
| 320 | 76.48 |
| 330 | 78.87 |
| 340 | 81.26 |
| 350 | 83.65 |
| 360 | 86.04 |
| 370 | 88.43 |
| 380 | 90.82 |
| 390 | 93.21 |
| 400 | 95.60 |
How it is computed
Calories = joules ÷ 4.184. The thermochemical calorie is defined as exactly 4.184 J; the same ratio converts kilojoules to kilocalories.
FAQ
Are food Calories the same as calories?+
No. A food Calorie (capital C) is a kilocalorie, 1,000 calories. A label's 200 kcal is 836.8 kJ.
Why do some sources use 4.1868?+
That is the International Table calorie, used in some engineering work. It differs from 4.184 by 0.07%.