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Calorie Converters

Convert between different calorie units and food energy measurements.

What this tool does

Convert between different calorie units and food energy measurements. Type an amount in kilocalories (thermochemical), choose the units, and the tool converts it to kilojoules. It offers 8 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Calorie (thermochemical), Kilocalorie (thermochemical), Kilocalorie (International Table), Kilojoule, Joule, Watt-hour, British thermal unit (International Table), Foot pound-force. Starts as Kilocalorie (thermochemical).
  • To: Choose one of the same 8 units as "From". Starts as Kilojoule.

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 kilocalories (thermochemical) to kilojoules:

  • 1 kcal (th) = 4.184 kJ
  • 5 kcal (th) = 20.92 kJ
  • 10 kcal (th) = 41.84 kJ
  • 50 kcal (th) = 209.2 kJ
  • 100 kcal (th) = 418.4 kJ

Multiply the number of kilocalories (thermochemical) by 4.184 to get kilojoules. Both units are exact definitions, so 4.184 is the exact factor: 1 kcal (th) = 4.184 kJ.

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

Limitations

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

FAQs

Q: How many kilojoules are in one kilocalorie (thermochemical)?
A: One kilocalorie (thermochemical) is 4.184 kilojoules. 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. A food Calorie (capital C) is one kilocalorie.
Q: Can I convert from kilojoules to kilocalories (thermochemical)?
A: Yes. Choose kilojoule in the From box and kilocalorie (thermochemical) in the To box. One kilojoule is about 0.23900574 kilocalories (thermochemical).

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