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cal to kcal Converter

Convert between calories (cal) and kilocalories (kcal) instantly. Bidirectional energy unit converter for nutrition and physics.

What this tool does

Convert between calories (cal) and kilocalories (kcal) instantly. Bidirectional energy unit converter for nutrition and physics. Type an amount in calories (thermochemical), choose the units, and the tool converts it to kilocalories (thermochemical). It offers 4 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Calorie (thermochemical), Kilocalorie (thermochemical), Joule, Kilojoule. Starts as Calorie (thermochemical).
  • To: Choose one of the same 4 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 calories (thermochemical) to kilocalories (thermochemical):

  • 1 cal (th) = 0.001 kcal (th)
  • 5 cal (th) = 0.005 kcal (th)
  • 10 cal (th) = 0.01 kcal (th)
  • 50 cal (th) = 0.05 kcal (th)
  • 100 cal (th) = 0.1 kcal (th)

Multiply the number of calories (thermochemical) by 0.001 to get kilocalories (thermochemical). Both units are exact definitions, so 0.001 is the exact factor: 1 cal (th) = 0.001 kcal (th).

Sources: Calorie (thermochemical): NIST SP 811 (2008), Appendix B.8. 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 calorie (thermochemical)?
A: One calorie (thermochemical) is 0.001 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.
Q: Can I convert from kilocalories (thermochemical) to calories (thermochemical)?
A: Yes. Choose kilocalorie (thermochemical) in the From box and calorie (thermochemical) in the To box. One kilocalorie (thermochemical) is 1000 calories (thermochemical).

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