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Energy Converter

Convert between joules, calories, BTU, kilowatt-hours, and other energy units.

What this tool does

Convert between joules, calories, BTU, kilowatt-hours, and other energy units. Type an amount in joules, choose the units, and the tool converts it to kilocalories (thermochemical). It offers 9 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 9 options, including Joule, Kilojoule, Calorie (thermochemical), Kilocalorie (thermochemical), British thermal unit (International Table), Kilowatt-hour. Starts as Joule.
  • To: Choose one of the same 9 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 joules to kilocalories (thermochemical):

  • 1 J ≈ 0.000239006 kcal (th)
  • 5 J ≈ 0.00119503 kcal (th)
  • 10 J ≈ 0.00239006 kcal (th)
  • 50 J ≈ 0.0119503 kcal (th)
  • 100 J ≈ 0.0239006 kcal (th)

Multiply the number of joules by about 0.000239006 to get kilocalories (thermochemical). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Joule: SI Brochure, 9th edition (2019). 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 joule?
A: One joule is about 0.00023900574 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 joules?
A: Yes. Choose kilocalorie (thermochemical) in the From box and joule in the To box. One kilocalorie (thermochemical) is 4184 joules.

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