⚡ Energy converter

Joule to Kilocalorie Converter

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

J

Results

Kilocalories
0.000239005736138 kcal
Same value in every unit

📊 Joule to Kilocalorie chart

Joule to Kilocalorie — plotted against joule (j).

How to convert joules to kilocalories

To convert joules to kilocalories, multiply by 0.000239005736138. Energy conversions connect nutrition, electricity bills, heating systems and physics.

kcal = J × 0.000239005736138 J = kcal ÷ 0.000239005736138
Joule to Kilocalorie conversion – J to kcal formula illustration
Joule (J) → Kilocalorie (kcal) at a glance.

Joule to Kilocalorie conversion table

Joule (J)Kilocalorie (kcal)
0.1 J0.0000239005736138 kcal
0.5 J0.000119502868069 kcal
1 J0.000239005736138 kcal
2 J0.000478011472275 kcal
3 J0.000717017208413 kcal
4 J0.000956022944551 kcal
5 J0.00119502868069 kcal
10 J0.00239005736138 kcal
20 J0.00478011472275 kcal
25 J0.00597514340344 kcal
50 J0.0119502868069 kcal
100 J0.0239005736138 kcal
500 J0.119502868069 kcal
1,000 J0.239005736138 kcal

About the units

Joule (J)

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

Kilocalorie (kcal)

A kilocalorie (food Calorie) equals 1,000 small calories, or 4,184 joules.

How to use this converter

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

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 kilocalories are in one joule?

One joule equals 0.000239005736138 kilocalories. 0.000239005736138 is the exact factor used by this converter.

How do I convert joules to kilocalories?

Multiply the value in joules by 0.000239005736138. To go the other way, multiply kilocalories by 4,184.

What is 10 J in kcal?

10 J = 0.00239005736138 kcal. Also, 5 J = 0.00119502868069 kcal and 100 J = 0.0239005736138 kcal.

What is the difference between a joule and a kilocalorie?

The joule is the SI unit of energy, the work done by one newton over one meter. A kilocalorie (food Calorie) equals 1,000 small calories, or 4,184 joules.

Is this tool free and private?

Yes — the Joule to Kilocalorie 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.

Related tools

Energy ConverterConvert any energy unit to all others at once — J, kJ, cal, kcal, kWh, BTU.Kilocalorie to JouleConvert kilocalories (kcal) to joules (J) instantly with the exact formula, a…Joule to KilojouleConvert joules (J) to kilojoules (kJ) instantly with the exact formula, a conversion…Joule to CalorieConvert joules (J) to calories (cal) instantly with the exact formula, a conversion…Joule to Kilowatt-hourConvert joules (J) to kilowatt hours (kWh) instantly with the exact formula, a…Joule to BTUConvert joules (J) to BTU (BTU) instantly with the exact formula, a conversion table…

📬 Get new tools first — free

Join Taurang to hear about new calculators, converters and features. No spam; unsubscribe anytime.

Create free account