How many joules are in one kilocalorie?

There are 4,184 joules in 1 kilocalorie.

How do you convert joules to kilocalories?

Multiply the number of joules by 0.000239006 — or use the formula kcal = J ÷ 4,184.

What is 6 joules in kilocalories?

6 joules is 0.001434034 kilocalories. 6 ÷ 4,184 = 0.001434034 kilocalories.

Is the joules to kilocalories conversion exact?

Yes. The relationship is fixed by definition, so 0.000239005736 is an exact conversion factor — only the displayed result is rounded.

Joules to Kilocalories Converter

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

What is 1 joule in kilocalories?

1 joule is equal to 0.000239006 kilocalories.

1 ÷ 4,184 = 0.000239006 kilocalories

Amount

Result0.0002390057

1 joule = 0.0002390057 kilocalories

Joules to Kilocalories formula

kcal = J ÷ 4,184

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

Worked examples

2 joules = 0.000478011 kilocalories — 2 ÷ 4,184 = 0.000478011 kilocalories
6 joules = 0.001434034 kilocalories — 6 ÷ 4,184 = 0.001434034 kilocalories
10 joules = 0.002390057 kilocalories — 10 ÷ 4,184 = 0.002390057 kilocalories

Joules to Kilocalories conversion table

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

joules to kilocalories conversion table
Joules (J)	Kilocalories (kcal)
1 J	0.00023901 kcal
2 J	0.00047801 kcal
3 J	0.00071702 kcal
4 J	0.00095602 kcal
5 J	0.00119503 kcal
6 J	0.00143403 kcal
7 J	0.00167304 kcal
8 J	0.00191205 kcal
9 J	0.00215105 kcal
10 J	0.00239006 kcal
12 J	0.00286807 kcal
15 J	0.00358509 kcal
20 J	0.00478011 kcal
25 J	0.00597514 kcal
30 J	0.00717017 kcal
50 J	0.01195029 kcal
75 J	0.01792543 kcal
100 J	0.02390057 kcal
500 J	0.11950287 kcal
1,000 J	0.23900574 kcal

When you need to convert joules to kilocalories

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 joule = 0.000239 kilocalories, the answer should be smaller 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

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.
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.

Frequently asked questions

What is 1 joule in kilocalories?: 1 joule is equal to 0.000239006 kilocalories.
How many joules are in one kilocalorie?: There are 4,184 joules in 1 kilocalorie.
How do you convert joules to kilocalories?: Multiply the number of joules by 0.000239006 — or use the formula kcal = J ÷ 4,184.
What is 6 joules in kilocalories?: 6 joules is 0.001434034 kilocalories. 6 ÷ 4,184 = 0.001434034 kilocalories.
Is the joules to kilocalories conversion exact?: Yes. The relationship is fixed by definition, so 0.000239005736 is an exact conversion factor — only the displayed result is rounded.