Kilocalories to Kilojoules (kcal → kJ)
Formula
1 kcal = 4.184 kJConversion Table
| kcal | kJ |
|---|---|
| 0 | 0 |
| 1.0000 | 4.1840 |
| 2.0000 | 8.3680 |
| 3.0000 | 12.552 |
| 4.0000 | 16.736 |
| 5.0000 | 20.920 |
| 6.0000 | 25.104 |
| 7.0000 | 29.288 |
| 8.0000 | 33.472 |
| 9.0000 | 37.656 |
| 10.000 | 41.840 |
| 11.000 | 46.024 |
| 12.000 | 50.208 |
| 13.000 | 54.392 |
| 14.000 | 58.576 |
| 15.000 | 62.760 |
| 16.000 | 66.944 |
| 17.000 | 71.128 |
| 18.000 | 75.312 |
| 19.000 | 79.496 |
| kcal | kJ |
|---|---|
| 20.000 | 83.680 |
| 21.000 | 87.864 |
| 22.000 | 92.048 |
| 23.000 | 96.232 |
| 24.000 | 100.42 |
| 25.000 | 104.60 |
| 26.000 | 108.78 |
| 27.000 | 112.97 |
| 28.000 | 117.15 |
| 29.000 | 121.34 |
| 30.000 | 125.52 |
| 31.000 | 129.70 |
| 32.000 | 133.89 |
| 33.000 | 138.07 |
| 34.000 | 142.26 |
| 35.000 | 146.44 |
| 36.000 | 150.62 |
| 37.000 | 154.81 |
| 38.000 | 158.99 |
| 39.000 | 163.18 |
| kcal | kJ |
|---|---|
| 40.000 | 167.36 |
| 41.000 | 171.54 |
| 42.000 | 175.73 |
| 43.000 | 179.91 |
| 44.000 | 184.10 |
| 45.000 | 188.28 |
| 46.000 | 192.46 |
| 47.000 | 196.65 |
| 48.000 | 200.83 |
| 49.000 | 205.02 |
| 50.000 | 209.20 |
| 51.000 | 213.38 |
| 52.000 | 217.57 |
| 53.000 | 221.75 |
| 54.000 | 225.94 |
| 55.000 | 230.12 |
| 56.000 | 234.30 |
| 57.000 | 238.49 |
| 58.000 | 242.67 |
| 59.000 | 246.86 |
| kcal | kJ |
|---|---|
| 60.000 | 251.04 |
| 61.000 | 255.22 |
| 62.000 | 259.41 |
| 63.000 | 263.59 |
| 64.000 | 267.78 |
| 65.000 | 271.96 |
| 66.000 | 276.14 |
| 67.000 | 280.33 |
| 68.000 | 284.51 |
| 69.000 | 288.70 |
| 70.000 | 292.88 |
| 71.000 | 297.06 |
| 72.000 | 301.25 |
| 73.000 | 305.43 |
| 74.000 | 309.62 |
| 75.000 | 313.80 |
| 76.000 | 317.98 |
| 77.000 | 322.17 |
| 78.000 | 326.35 |
| 79.000 | 330.54 |
Kilocalories to Kilojoules Conversion
Converting Kilocalories (kcal) to Kilojoules (kJ) is a common energy and power conversion. 1 kcal equals 4.184 kJ. For example, 100 kcal is equal to 418.4 kJ.
Quick Mental Math: Kilocalories to Kilojoules
0.239 kilocalories is 1 kilojoule, so use that as the mental anchor.
Why is converting Kilocalories to Kilojoules tricky?
kilocalories to kilojoules is easy to botch because small calories and food Calories differ by a factor of 1,000.
Quick Reference Values
1 kcal = 4.184 kJ. 5 kcal = 20.92 kJ. 10 kcal = 41.84 kJ. 25 kcal = 104.6 kJ. 50 kcal = 209.2 kJ. 100 kcal = 418.4 kJ.
What is Kilocalories?
Kilocalories (kcal) is a unit of energy and power. A kilocalorie equals exactly 1,000 calories and represents the amount of energy needed to raise the temperature of 1 kilogram of water by 1 degree Celsius. It is widely used to quantify food energy and is equivalent to 4,184 joules [bipm-si-brochure]. The calorie was introduced in the early 19th century by Nicolas Clément as a unit of heat energy. The kilocalorie became standard in nutrition science by the early 20th century to express food energy content [bipm-si-brochure]. Kilocalories are used globally in nutrition labeling, especially in the US and Europe, to indicate energy content of foods. Scientific contexts often prefer joules, but kcal remains prevalent in dietetics [nist-sp-811].
What is Kilojoules?
Kilojoules (kJ) is a unit of energy and power. A kilojoule is a unit of energy equal to 1,000 joules. It quantifies work, heat, or energy transfer in the metric system, with one joule defined as one newton meter. Kilojoules are widely applied in physics, chemistry, and nutrition to measure energy content or expenditure [iso-80000]. The joule unit was named after James Prescott Joule in the late 19th century, reflecting mechanical equivalent of heat measurements. The kilojoule, as a multiple, became common with SI adoption to express larger energy quantities clearly and is standardized by ISO and BIPM [bipm-si-brochure]. Kilojoules are standard in scientific disciplines globally for energy quantification. Nutrition labels in many countries use kilojoules to indicate food energy content, while engineering and physics consistently apply kJ for energy calculations [nist-si-guide].
Common Misspellings
People often search for this conversion using these alternate spellings: kilo calories, kcalorie, kilo-calories, kilojoule, kilo joules, kilojouls, kilojoules energy, kj. All of these refer to the Kilocalories to Kilojoules conversion.