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Kilocalories to Kilojoules

Type a value in Kilocalories or Kilojoules; the other field updates as you type.

Runs in your browser No sign-up

Swap units

100 kcal = 418.4 kJ

Decimals

Common values

Kilocalories (kcal)Kilojoules (kJ)
1 kcal4.184 kJ
2.5 kcal10.46 kJ
5 kcal20.92 kJ
10 kcal41.84 kJ
25 kcal104.6 kJ
50 kcal209.2 kJ
100 kcal418.4 kJ
250 kcal1,046 kJ
500 kcal2,092 kJ
1,000 kcal4,184 kJ
2,000 kcal8,368 kJ
2,500 kcal10,460 kJ
5,000 kcal20,920 kJ
10,000 kcal41,840 kJ

How to use it

  1. Type the number of Kilocalories in the first field.
  2. Read the result in Kilojoules. You can also type in the Kilojoules field to convert the other way.
  3. Use the table of common values, or copy the result with one click.

How it works

Formula: kJ = kcal × 4.184

1 kcal = 4.184 kJ, and 1 kJ = 0.239006 kcal.

Results use the exact definitions of both units. The page shows up to 6 decimal places; copy the value for full precision.

Examples

1 kcal in kJ

1 kcal = 4.184 kJ, using kJ = kcal × 4.184.

100 kcal in kJ

100 kcal = 418.4 kJ, using kJ = kcal × 4.184.

500 kcal in kJ

500 kcal = 2,092 kJ, using kJ = kcal × 4.184.

Frequently asked questions

How do I convert Kilocalories to Kilojoules?

Use the formula kJ = kcal × 4.184. For example, 1 kcal = 4.184 kJ.

How do I convert Kilojoules back to Kilocalories?

Use the reverse formula kcal = kJ × 0.23900574. For example, 1 kJ = 0.239006 kcal.

How accurate is this converter?

It uses the exact legal definitions of the units, so the only rounding is in the number of decimals shown. Copy the result to get the full value.

Privacy

The conversion runs entirely in your browser. Nothing you type is sent anywhere.