Kilocalories to kilojoules converter

1 kcal = 4.184 kJ (exact). To convert kilocalories to kilojoules, multiply by 4.184. Example: 10 kcal = 41.84 kJ.

Result (kJ)

kJ = kcal × 4.184 · Swap: Kilojoules to kilocalories

Open the full tool: Unit converter →

Kilocalories to kilojoules chart

KilocaloriesKilojoules
1 kcal4.184 kJ
10 kcal41.84 kJ
50 kcal209.2 kJ
100 kcal418.4 kJ
150 kcal627.6 kJ
200 kcal836.8 kJ
250 kcal1046 kJ
300 kcal1255.2 kJ
500 kcal2092 kJ
1000 kcal4184 kJ
1500 kcal6276 kJ
2000 kcal8368 kJ
2500 kcal10,460 kJ

How to convert kilocalories to kilojoules

Formula: kJ = kcal × 4.184. Worked example: 10 kcal = 41.84 kJ. Quick estimate: multiply by about 4.2 — the error is 0.38%, fine for everyday use but not for engineering or shopping by exact size.

About these units

The food Calorie (kilocalorie) is exactly 4.184 kJ (thermochemical calorie). EU and many other labels show energy in both units: 2,000 kcal ≈ 8,368 kJ, the reference daily intake used on labels.

Category: energy. Results on this page are calculated in your browser and rounded to 7 significant digits; the table above uses 6. For other units of energy open the full unit converter, or use the reverse page — kilojoules to kilocalories.

FAQ

How many kilojoules are in one kcal?

1 kcal = 4.184 kJ exactly. Conversely, 1 kJ = 0.2390057 kcal.

What is 100 kcal in kilojoules?

100 kcal = 418.4 kJ.

Is this converter accurate?

Yes — it uses the official definitions (1 kcal = 4.184 kJ, 1 kJ = 1 kJ) and shows results rounded to 7 significant digits.

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