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Kilocalorie to Kilojoule Converter

Convert kilocalories to kilojoules online. 1 kcal = 4.184 kJ. Free, instant Kilocalorie-to-Kilojoule converter. 100% in your browser, no uploads.

Kilocalorie → Kilojoule

1 kcal = 4.184 kJ

Kilocalorie to Kilojoule conversion table

Kilocalorie (kcal)Kilojoule (kJ)
1 kcal4.184 kJ
2 kcal8.368 kJ
5 kcal20.92 kJ
10 kcal41.84 kJ
25 kcal104.6 kJ
50 kcal209.2 kJ
100 kcal418.4 kJ
  • Instant, live Kilocalorie ↔ 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 Kilocalorie to Kilojoule Converter

  1. 1

    Type the number of kilocalories 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 kilocalories — it works both ways.

  4. 4

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

About the Kilocalorie to Kilojoule Converter

The ByteTools Kilocalorie to Kilojoule Converter changes kilocalories into kilojoules instantly. One Kilocalorie equals 4.184 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 Kilocalorie-to-Kilojoule values at a glance.

Frequently asked questions

How many Kilojoules are in a Kilocalorie?

One Kilocalorie equals 4.184 Kilojoules (kJ). To convert, multiply the number of Kilocalories by 4.184. For example, 10 Kilocalories = 41.84 Kilojoules.

What is the formula to convert Kilocalories to Kilojoules?

Multiply the Kilocalorie value by 4.184 to get Kilojoules. In symbols, kJ = kcal × 4.184. This converter applies the exact factor automatically so you never round by hand.

How do I convert Kilojoules back to Kilocalories?

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

Is this Kilocalorie 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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