/convert/calories-to-kilojoules/ Convert calories (kcal) to kilojoules instantly. Enter any value and get the result. Includes a conversion table and the exact formula. article Calories (Kcal) to Kilojoules Converter — 247QuickTools ,{ "@context": "https://schema.org", "@type": "SpeakableSpecification", "cssSelector": [".tool-intro", ".info-gain-section"] }
⚡ Energy

Calories (Kcal) to Kilojoules Converter

Convert calories (kcal) to kilojoules instantly. Enter any value and get the result. Includes a conversion table and the exact formula.

Quick answer: To convert calories (kcal) to kilojoules, multiply by 4.184. For example, 1 calories (kcal) = 4.184 kilojoules. Use the calculator below for any value.
calories (kcal) to kilojoules
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Common conversions
Calories (Kcal) Kilojoules
Formula:

How to convert calories (kcal) to kilojoules

1

Enter your value

Type the number of calories (kcal) you want to convert into the left box. The result in kilojoules appears instantly in the right box. You can also type into the right box to convert in the other direction.

2

Use the swap button

Click the ⇄ Swap button to reverse the conversion — Kilojoules to Calories (Kcal). Your current value carries across so you don't have to re-enter anything.

3

About Calories (Kcal) and Kilojoules

Calories (kcal) are the common unit for food energy. Kilojoules (kJ) are used on nutrition labels in many countries. 1 kcal = 4.184 kJ.

💡 Did you know?

1 kcal = 4.184 kJ. Athletes counting calories often work in kJ for accuracy — 4-digit numbers (e.g. 8,400 kJ) feel more concrete than 4-digit kcal estimates.

📊 Common conversions at a glance
Calories (Kcal) Kilojoules
50 209.2
100 418.4
150 627.6
200 836.8
250 1046
300 1255
Reviewed for 2026. Calories (Kcal) ↔ Kilojoules conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.