What this tool does
Convert kilocalories (kcal) to and from calories, joules, kilojoules, watt-hours and other energy units. Type an amount in kilocalories (thermochemical), choose the units, and the tool converts it to kilojoules. 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 Kilocalorie (thermochemical), Calorie (thermochemical), Joule, Kilojoule, Watt-hour, Kilowatt-hour. Starts as Kilocalorie (thermochemical).
- To: Choose one of the same 9 units as "From". Starts as Kilojoule.
How to use
- Enter the amount you want to convert.
- Choose the unit to convert from and the unit to convert to.
- 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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