complete.tools

Kilojoule Converters

Convert kilojoules to and from calories, kilocalories, watt-hours, BTU and other energy units.

What this tool does

Convert kilojoules to and from calories, kilocalories, watt-hours, BTU and other energy units. Type an amount in kilojoules, choose the units, and the tool converts it to kilocalories (thermochemical). It offers 10 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 10 options, including Kilojoule, Joule, Calorie (thermochemical), Kilocalorie (thermochemical), Watt-hour, Kilowatt-hour. Starts as Kilojoule.
  • To: Choose one of the same 10 units as "From". Starts as Kilocalorie (thermochemical).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from kilojoules to kilocalories (thermochemical):

  • 1 kJ ≈ 0.239006 kcal (th)
  • 5 kJ ≈ 1.195029 kcal (th)
  • 10 kJ ≈ 2.390057 kcal (th)
  • 50 kJ ≈ 11.950287 kcal (th)
  • 100 kJ ≈ 23.900574 kcal (th)

Multiply the number of kilojoules by about 0.239006 to get kilocalories (thermochemical). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Kilojoule: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes). Kilocalorie (thermochemical): exact by definition.

Limitations

  • Converts units of energy only. It does not work out energy from power, time, voltage or charge.

FAQs

Q: How many kilocalories (thermochemical) are in one kilojoule?
A: One kilojoule is about 0.23900574 kilocalories (thermochemical). Change the value to convert any amount; the other units are listed below the result.
Q: Which definition of the units does this page use?
A: Calories here are thermochemical calories (1 cal = 4.184 J exactly), the definition commonly used in chemistry and nutrition. The International Table calorie (4.1868 J) is slightly larger. BTU here is the International Table BTU (about 1055.06 J), the usual definition for heating and cooling. The thermochemical BTU is slightly smaller.
Q: Can I convert from kilocalories (thermochemical) to kilojoules?
A: Yes. Choose kilocalorie (thermochemical) in the From box and kilojoule in the To box. One kilocalorie (thermochemical) is 4.184 kilojoules.

Explore Similar Tools

Explore more tools like this one: