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Kilocalories to Kilojoules

1 kilocalorie (food Calorie) = 4.184 kilojoules · 1 kJ = 0.23901 kcal

1 kilocalorie (food Calorie) = 4.184 kilojoules

How it’s calculated

kJ = kcal × 4.184

  • Multiply the value in kilocalories by 4.184.
  • To go back, divide by 4.184 (or multiply by 0.2390057361).
  • 1 kcal = 4.184 kJ · 1 kJ = 0.2390057361 kcal
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 kcal = 4184 J and 1 kJ = 1000 J, so 1 kcal = 4.184 kJ. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.) (SI prefixes and accepted units).

  2. Multiply by the factor written as a fraction

    Put kcal in the denominator so it cancels, leaving kJ.

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 4.184 kJ

1 kcal in other units

Batch convert kcal → kJ
Results
  1. 1 kcal = 4.184 kJ
  2. 5 kcal = 20.92 kJ
  3. 10 kcal = 41.84 kJ
  4. 25 kcal = 104.6 kJ

Permanent link to this conversion

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Quick examples

  • 1 kilocalorie (food Calorie) = 4.184 kilojoules
  • 5 kilocalories = 20.92 kilojoules
  • 10 kilocalories = 41.84 kilojoules
  • 25 kilocalories = 104.6 kilojoules
  • 100 kilocalories = 418.4 kilojoules

About these units

Kilocalorie (food Calorie) (kcal)

other

Exactly 4 184 J. A food "Calorie" on nutrition labels is one kilocalorie.

1 kcal = 4184 J

Source: NIST SP 811 / Handbook 44

Kilojoule (kJ)

SI (metric)

1 kJ = 1000 J

Source: BIPM SI Brochure (9th ed.) (SI prefixes and accepted units)

Kilocalories to kilojoules conversion table

kilocalorie (food Calorie) (kcal) to kilojoule (kJ)
Kilocalories (kcal)Kilojoules (kJ)
0.1 kcal0.4184 kJ
0.5 kcal2.092 kJ
1 kcal4.184 kJ
2 kcal8.368 kJ
3 kcal12.552 kJ
4 kcal16.736 kJ
5 kcal20.92 kJ
6 kcal25.104 kJ
7 kcal29.288 kJ
8 kcal33.472 kJ
9 kcal37.656 kJ
10 kcal41.84 kJ
15 kcal62.76 kJ
20 kcal83.68 kJ
25 kcal104.6 kJ
30 kcal125.52 kJ
40 kcal167.36 kJ
50 kcal209.2 kJ
75 kcal313.8 kJ
100 kcal418.4 kJ
250 kcal1,046 kJ
500 kcal2,092 kJ
1,000 kcal4,184 kJ

Related conversions

Frequently asked questions

How do I convert kilocalories to kilojoules?

Use kJ = kcal × 4.184. Multiply the value in kilocalories by 4.184.

How many kilojoules are in 1 kilocalorie (food Calorie)?

1 kilocalorie (food Calorie) (kcal) equals 4.184 kilojoules (kJ).

How many kilocalories are in 1 kilojoule?

1 kilojoule (kJ) equals 0.23901 kilocalories (kcal); more precisely 0.2390057361.

What is 10 kcal in kJ?

10 kilocalories = 41.84 kilojoules.

What is a kilocalorie (food Calorie)?

Exactly 4 184 J. A food "Calorie" on nutrition labels is one kilocalorie.

Formula: kJ = kcal × 4.184. Factors last reviewed 2026-10-27.