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Calorie to Joule Converter

Convert calories to joules online. 1 cal = 4.184 J. Free, instant Calorie-to-Joule converter. Works both ways with a formula and reference table.

Calorie → Joule

1 cal = 4.184 J

Calorie to Joule conversion table

Calorie (cal)Joule (J)
1 cal4.184 J
2 cal8.368 J
5 cal20.92 J
10 cal41.84 J
25 cal104.6 J
50 cal209.2 J
100 cal418.4 J
  • Instant, live Calorie ↔ Joule conversion
  • Accurate to the exact conversion factor
  • Converts in both directions
  • Reference table of common values
  • 100% private — runs entirely in your browser
  • Free, no sign-up, works offline

How to use the Calorie to Joule Converter

  1. 1

    Type the number of calories in the first box.

  2. 2

    Read the equivalent value in joules instantly in the second box.

  3. 3

    Or type a Joule value to convert back to calories — it works both ways.

  4. 4

    Copy the result, or check the reference table for common conversions.

About the Calorie to Joule Converter

The ByteTools Calorie to Joule Converter changes calories into joules instantly. One Calorie equals 4.184 Joules (J), and the tool applies that exact factor as you type so you get a precise answer every time.

Energy conversions appear in nutrition, physics, utility bills and fitness between joules, calories and kilowatt-hours. Everything is calculated locally in your browser — nothing is uploaded — so it is fast, private and works offline. Enter a number in either box to convert both ways, and use the table for common Calorie-to-Joule values at a glance.

Frequently asked questions

How many Joules are in a Calorie?

One Calorie equals 4.184 Joules (J). To convert, multiply the number of Calories by 4.184. For example, 10 Calories = 41.84 Joules.

What is the formula to convert Calories to Joules?

Multiply the Calorie value by 4.184 to get Joules. In symbols, J = cal × 4.184. This converter applies the exact factor automatically so you never round by hand.

How do I convert Joules back to Calories?

Divide by 4.184, or multiply by 0.23900574. You can also use our Joule to Calorie converter for the reverse direction — it uses the same exact factor.

Is this Calorie to Joule converter free and private?

Yes. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, logged or stored. It is completely free, needs no sign-up and keeps working offline once loaded.

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