⚡ Energy converter

Calorie to Joule Converter

Convert calories (cal) to joules (J) instantly with the exact formula, a conversion table and chart.

cal

Results

Joules
4.184 J
Same value in every unit

📊 Calorie to Joule chart

Calorie to Joule — plotted against calorie (cal).

How to convert calories to joules

To convert calories to joules, multiply by 4.184. Energy conversions connect nutrition, electricity bills, heating systems and physics.

J = cal × 4.184 cal = J ÷ 4.184
Calorie to Joule conversion – cal to J formula illustration
Calorie (cal) → Joule (J) at a glance.

Calorie to Joule conversion table

Calorie (cal)Joule (J)
0.1 cal0.4184 J
0.5 cal2.092 J
1 cal4.184 J
2 cal8.368 J
3 cal12.552 J
4 cal16.736 J
5 cal20.92 J
10 cal41.84 J
20 cal83.68 J
25 cal104.6 J
50 cal209.2 J
100 cal418.4 J
500 cal2,092 J
1,000 cal4,184 J

About the units

Calorie (cal)

A (small) thermochemical calorie is exactly 4.184 joules.

Joule (J)

The joule is the SI unit of energy, the work done by one newton over one meter.

How to use this converter

  1. Type the number of calories (cal) in the input box.
  2. The result in joules appears instantly — no button needed.
  3. See the same value in every other energy unit just below.
  4. Use “Swap units” to convert joules back to calories.

Tips for better results

  • Double-check which system a unit belongs to (for example US vs UK gallons).
  • Use the swap button to convert in the opposite direction instantly.
  • Bookmark the conversions you use most — each pair has its own page.

Frequently asked questions

How many joules are in one calorie?

One calorie equals 4.184 joules. 4.184 is the exact factor used by this converter.

How do I convert calories to joules?

Multiply the value in calories by 4.184. To go the other way, multiply joules by 0.239005736138.

What is 10 cal in J?

10 cal = 41.84 J. Also, 5 cal = 20.92 J and 100 cal = 418.4 J.

What is the difference between a calorie and a joule?

A (small) thermochemical calorie is exactly 4.184 joules. The joule is the SI unit of energy, the work done by one newton over one meter.

Is this tool free and private?

Yes — the Calorie to Joule is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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