kcal to kJ Converter - Kilocalorie to Kilojoule

Kilocalorie (kcal) to Kilojoule (kJ)

Direct answer

1 kcal = 4.184 kJ

kJ = kcal × 4.184

Converter

Input

kcal

Result

4.184kJ

kJ = kcal × 4.184

kcal = kJ × 0.239005736138

Example: 10 kcal = 10 × 4.184 = 41.84 kJ.

Express both kcal and kJ in the same base unit J (joule), then cancel the shared base unit.

1
Rewrite kcal in the base unit
$1 kcal = 4, 184 J$
2
Rewrite kJ in the base unit
$1 kJ = 1, 000 J$
3
Forward conversion
$1 kcal = \frac{4 , 184 J}{1 , 000 J} \times 1 kJ = \frac{4 , 184}{1 , 000} kJ = 4.184 kJ$
4
Reverse conversion
$1 kJ = \frac{1 , 000 J}{4 , 184 J} \times 1 kcal = \frac{1 , 000}{4 , 184} kcal = 0.239005736138 kcal$

A guarded explanation for this pair page covering definition, principle, assumptions, and cautions.

Guarded output

AI text is for interpretation only. The page calculator remains the source of truth for numeric results.

1 kcal = 4.184 kJ.

10 kcal = 41.84 kJ.

100 kcal = 418.4 kJ.

Use kJ = kcal × 4.184.

1 kJ = 0.239005736138 kcal.

Use the conversion factor and round the result to the precision required by your calculation.