/convert/calories-to-joules/ Convert calories (kcal) to joules instantly. Includes a reference table and formula. article calories (kcal) to joules Converter — 247QuickTools ,{ "@context": "https://schema.org", "@type": "SpeakableSpecification", "cssSelector": [".tool-intro", ".info-gain-section"] }
⚡ Energy

calories (kcal) to joules Converter

Convert calories (kcal) to joules instantly. Includes a reference table and formula.

Quick answer: To convert calories (kcal) to joules, multiply by 4184. For example, 1 calories (kcal) = 4184 joules. Use the calculator below for any value.
calories (kcal) to joules
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Common conversions
calories (kcal) joules
Formula:

How to convert calories (kcal) to joules

1

Enter your value

Type the number of calories (kcal) you want to convert into the left box. The result in joules 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 — joules to calories (kcal). Your current value carries across so you don't have to re-enter anything.

3

About calories (kcal) and joules

calories (kcal) and joules are both energy. Use this converter to switch between them instantly.

💡 Did you know?

1 cal (small calorie) = 4.184 J. 1 food Calorie = 1 kcal = 4,184 J. The calorie was defined by Nicolas Clément in 1824 as the heat needed to raise 1 g of water by 1°C. The inconsistency between the small calorie and food Calorie has caused numerous diet and nutrition errors.

📊 Common conversions at a glance
calories (kcal) joules
0.1 418.4
0.5 2092
1 4184
2 8368
5 2.092e+04
10 4.184e+04
Reviewed for 2026. calories (kcal) ↔ joules 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.