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Calorie to Kilojoule Converter

Convert calories to kilojoules online. 1 cal = 0.004184 kJ. Free, instant Calorie-to-Kilojoule converter. Works both ways with a formula and reference table.

Calorie → Kilojoule

1 cal = 0.004184 kJ

Calorie to Kilojoule conversion table

Calorie (cal)Kilojoule (kJ)
1 cal0.004184 kJ
2 cal0.008368 kJ
5 cal0.02092 kJ
10 cal0.04184 kJ
25 cal0.1046 kJ
50 cal0.2092 kJ
100 cal0.4184 kJ
  • Instant, live Calorie ↔ Kilojoule 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 Kilojoule Converter

  1. 1

    Type the number of calories in the first box.

  2. 2

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

  3. 3

    Or type a Kilojoule 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 Kilojoule Converter

The ByteTools Calorie to Kilojoule Converter changes calories into kilojoules instantly. One Calorie equals 0.004184 Kilojoules (kJ), 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-Kilojoule values at a glance.

Frequently asked questions

How many Kilojoules are in a Calorie?

One Calorie equals 0.004184 Kilojoules (kJ). To convert, multiply the number of Calories by 0.004184. For example, 10 Calories = 0.04184 Kilojoules.

What is the formula to convert Calories to Kilojoules?

Multiply the Calorie value by 0.004184 to get Kilojoules. In symbols, kJ = cal × 0.004184. This converter applies the exact factor automatically so you never round by hand.

How do I convert Kilojoules back to Calories?

Divide by 0.004184, or multiply by 239.005736. You can also use our Kilojoule to Calorie converter for the reverse direction — it uses the same exact factor.

Is this Calorie to Kilojoule 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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