How many kilocalories are in one joule?

There are 0.000239006 kilocalories in 1 joule.

How do you convert kilocalories to joules?

Multiply the number of kilocalories by 4,184 — or use the formula J = kcal × 4,184.

What is 6 kilocalories in joules?

6 kilocalories is 25,104 joules. 6 × 4,184 = 25,104 joules.

Is the kilocalories to joules 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 Joules Converter

Convert kilocalories to joules instantly with this free kilocalories to joules 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 joules?

1 kilocalorie is equal to exactly 4,184 joules.

1 × 4,184 = 4,184 joules

Amount

Result4,184

1 kilocalorie = 4,184 joules

Kilocalories to Joules formula

J = kcal × 4,184

The kilocalories to joules conversion factor is 4,184, which is exact by definition. 1 kilocalorie = 4,184 joules, and 1 joule = 0.000239005736 kilocalories.

Worked examples

2 kilocalories = 8,368 joules — 2 × 4,184 = 8,368 joules
6 kilocalories = 25,104 joules — 6 × 4,184 = 25,104 joules
10 kilocalories = 41,840 joules — 10 × 4,184 = 41,840 joules

Kilocalories to Joules conversion table

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

kilocalories to joules conversion table
Kilocalories (kcal)	Joules (J)
1 kcal	4,184 J
2 kcal	8,368 J
3 kcal	12,552 J
4 kcal	16,736 J
5 kcal	20,920 J
6 kcal	25,104 J
7 kcal	29,288 J
8 kcal	33,472 J
9 kcal	37,656 J
10 kcal	41,840 J
12 kcal	50,208 J
15 kcal	62,760 J
20 kcal	83,680 J
25 kcal	104,600 J
30 kcal	125,520 J
50 kcal	209,200 J
75 kcal	313,800 J
100 kcal	418,400 J
500 kcal	2,092,000 J
1,000 kcal	4,184,000 J

When you need to convert kilocalories to joules

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 joules, 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.
Joule (J): The SI unit of energy: one newton-meter. 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 joules?: 1 kilocalorie is equal to 4,184 joules.
How many kilocalories are in one joule?: There are 0.000239006 kilocalories in 1 joule.
How do you convert kilocalories to joules?: Multiply the number of kilocalories by 4,184 — or use the formula J = kcal × 4,184.
What is 6 kilocalories in joules?: 6 kilocalories is 25,104 joules. 6 × 4,184 = 25,104 joules.
Is the kilocalories to joules conversion exact?: Yes. The relationship is fixed by definition, so 4,184 is an exact conversion factor — only the displayed result is rounded.