How many kilocalories are in one kilojoule?

There are 0.239005736 kilocalories in 1 kilojoule.

How do you convert kilocalories to kilojoules?

Multiply the number of kilocalories by 4.184 — or use the formula kJ = kcal × 4.184.

What is 6 kilocalories in kilojoules?

6 kilocalories is 25.104 kilojoules. 6 × 4.184 = 25.104 kilojoules.

Is the kilocalories to kilojoules conversion exact?

Yes. The relationship is fixed by definition, so 4.184 is an exact conversion factor — only the displayed result is rounded.

Kilocalories to Kilojoules Converter

Convert kilocalories to kilojoules instantly with this free kilocalories to kilojoules converter. Enter any value to get an accurate energy conversion, plus the formula, the conversion factor and a full reference table.

What is 1 kilocalorie in kilojoules?

1 kilocalorie is equal to exactly 4.184 kilojoules.

1 × 4.184 = 4.184 kilojoules

Amount

Result4.184

1 kilocalorie = 4.184 kilojoules

Kilocalories to Kilojoules formula

kJ = kcal × 4.184

The kilocalories to kilojoules conversion factor is 4.184, which is exact by definition. 1 kilocalorie = 4.184 kilojoules, and 1 kilojoule = 0.239005736138 kilocalories.

Worked examples

2 kilocalories = 8.368 kilojoules — 2 × 4.184 = 8.368 kilojoules
6 kilocalories = 25.104 kilojoules — 6 × 4.184 = 25.104 kilojoules
10 kilocalories = 41.84 kilojoules — 10 × 4.184 = 41.84 kilojoules

Kilocalories to Kilojoules conversion table

Every value below is calculated with the exact conversion factor and rounded for display.

kilocalories to kilojoules conversion table
Kilocalories (kcal)	Kilojoules (kJ)
1 kcal	4.184 kJ
2 kcal	8.368 kJ
3 kcal	12.552 kJ
4 kcal	16.736 kJ
5 kcal	20.92 kJ
6 kcal	25.104 kJ
7 kcal	29.288 kJ
8 kcal	33.472 kJ
9 kcal	37.656 kJ
10 kcal	41.84 kJ
12 kcal	50.208 kJ
15 kcal	62.76 kJ
20 kcal	83.68 kJ
25 kcal	104.6 kJ
30 kcal	125.52 kJ
50 kcal	209.2 kJ
75 kcal	313.8 kJ
100 kcal	418.4 kJ
500 kcal	2,092 kJ
1,000 kcal	4,184 kJ

When you need to convert kilocalories to kilojoules

Comparing food energy labelled in calories with labels in kilojoules.
Reading utility bills and appliance ratings that mix kWh, joules and BTU.

Common mistakes to avoid

Dividing when you should multiply. Because 1 kilocalorie = 4.184 kilojoules, the answer should be larger than the number you started with.
Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.

How precise does the answer need to be?

Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.

How these units are defined

Kilocalorie (kcal): 1,000 small calories — the 'Calorie' on US nutrition labels. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Kilojoule (kJ): 1,000 joules; food energy labelling in Australia and New Zealand. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.

Frequently asked questions

What is 1 kilocalorie in kilojoules?: 1 kilocalorie is equal to 4.184 kilojoules.
How many kilocalories are in one kilojoule?: There are 0.239005736 kilocalories in 1 kilojoule.
How do you convert kilocalories to kilojoules?: Multiply the number of kilocalories by 4.184 — or use the formula kJ = kcal × 4.184.
What is 6 kilocalories in kilojoules?: 6 kilocalories is 25.104 kilojoules. 6 × 4.184 = 25.104 kilojoules.
Is the kilocalories to kilojoules conversion exact?: Yes. The relationship is fixed by definition, so 4.184 is an exact conversion factor — only the displayed result is rounded.