How many kilojoules are in a kilocalorie?

1 kcal = 4.184 kJ. To convert any amount, multiply by 4.184.

How do you convert kilocalories to kilojoules?

Multiply the number of kilocalories by 4.184 to get kilojoules. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Energy

Kilocalories to kilojoules converter

Convert kilocalories (kcal) to kilojoules (kJ). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert kilocalories to kilojoules— the formula

Kilocalories convert to kilojoules by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

kJ = kcal × 4.184

kcal = kJ × 0.239006

Joule: SI derived. 1 cal (thermochemical) = 4.184 J exactly; 1 kcal = 1000 cal. 1 kWh = 3,600,000 J exactly. 1 BTU (IT) = 1055.05585262 J (NIST SP 811).

Questions

Frequently asked questions

How many kilojoules are in a kilocalorie?
1 kcal = 4.184 kJ. To convert any amount, multiply by 4.184.
How do you convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184 to get kilojoules. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.