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Kcal to Joules Converter (Kilocalories to Joules)

1 kilocalorie (food Calorie) = 4,186.8 joules. To convert kcal to J, multiply by 4,186.8.

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100 kcal = 418,680 J

1 kcal
4,186.8 J
1 J
0.0002388 kcal
10 kcal
41,868 J
100 kcal
418,680 J

How to convert kcal to Joules

1 kilocalorie (food Calorie) equals 4,186.8 joules, so the conversion is a single multiplication.

J = kcal × 4,186.8

Example: 150 kcal × 4,186.8 = 628,020 J.

About the kilocalorie (food Calorie)

Kilocalorie (food Calorie) (kcal)

The kilocalorie is the “Calorie” on food labels. It's roughly the energy needed to warm 1 kg of water by 1 °C.

1 kilocalorie (food Calorie) in every energy unit

Kilojoules4.187 kJJoules4,186.8 J
Kilowatt-Hours0.001163 kWh
Calories1,000 cal
British Thermal Units3.968 Btu
Watt-Hours1.163 Wh
Megajoules0.004187 MJ
Gigajoules0.000004187 GJ
Megawatt-Hours0.000001163 MWh
Therms (US)0.00003969 thm
Electronvolts2.613e22 eV
Foot-Pounds3,088.025 ft·lbf
Ergs41,868,000,000 erg
Joules to kcalReverse conversionkcal to kJ1 kcal = 4.1868 kJkJ to kcal1 kJ = 0.2388 kcal

kcal to Joules FAQ

How many joules are in a kilocalorie (food Calorie)?

1 kilocalorie (food Calorie) = 4,186.8 joules.

How many kilocalories are in a joule?

1 joule = 0.0002388458966 kilocalories.

How do I convert kcal to J?

Use J = kcal × 4,186.8. For example, 10 kcal = 41,868 J.

Can I print this kcal to Joules chart?

Yes. Use "Print / Save PDF" next to the converter for a one-page chart, or "Download CSV" to open it in Excel or Google Sheets.