Kilocalories to Kilojoules Converter kcal → kJ
1 kilocalorie (kcal) = 4.184 kilojoules (kJ). Type a value below — the conversion happens instantly, entirely on your device.
1 kcal = 4.184 kJ
2000 kilocalories = 8368 kilojoules
2000 × 4.184 = 8368
1 kcal equals 4.184 kJ, so multiplying by 4.184 converts the value. The result describes the exact same quantity — only the measuring stick changes.
How to convert kilocalories to kilojoules
kilojoules = kilocalories × 4.184 — multiply the kilocalorie value by 4.184.
Example: 2000 kcal = 8368 kJ.
To convert the other way: kilocalories = kilojoules ÷ 4.184 — or use the dedicated kJ to kcal converter .
Kcal-to-kJ converts between the two food-energy units on nutrition labels. US labels use Calories (kcal); Australian, NZ and EU labels use kilojoules. A 2,000 kcal daily intake is 8,368 kJ. Multiply kcal by 4.184 for kJ.
Kilocalories to Kilojoules conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 0.1 | 0.4184 |
| 0.25 | 1.046 |
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 6 | 25.104 |
| 7 | 29.288 |
| 8 | 33.472 |
| 9 | 37.656 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 30 | 125.52 |
| 40 | 167.36 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| 250 | 1046 |
| 500 | 2092 |
| 1000 | 4184 |
About the units
What is a kilocalorie?
A kilocalorie (kcal) is 4,184 joules — identical to the food "Calorie" (capital C) on US nutrition labels. A 2,000-Calorie diet is 2,000 kcal or 8,368 kJ.
What is a kilojoule?
A kilojoule (kJ) is 1,000 joules. Food energy on labels in Australia, NZ and the EU is stated in kilojoules alongside or instead of kilocalories.
Frequently asked questions
How many kilojoules are in 1 kilocalorie?
1 kilocalorie (kcal) = 4.184 kilojoules (kJ).
What is the formula to convert kilocalories to kilojoules?
kilojoules = kilocalories × 4.184 — multiply the kilocalorie value by 4.184.
How do I convert kcal to kJ without a calculator?
Multiply by 4.18 for a close estimate. Exact factor: 1 kcal = 4.184 kJ.
Is this kcal-to-kJ converter accurate and private?
Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.
Are food Calories the same as kcal?
Yes — a food Calorie (capital C) is exactly one kilocalorie (kcal), which is 4.184 kJ. A 250-Calorie snack is 250 kcal or 1,046 kJ.