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Jouly na kalórie

Energy Converter

Joules (J)

What is Joules to Calories?

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A joules to calories converter converts the SI unit of energy (joules) to the calorie, commonly used in food energy labelling and nutrition. One food Calorie (kcal) = 4,184 joules.

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Vzorec

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f(x)cal = J × 0.239006; kcal = J × 0.000239006

Variable Legend

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Symbol	Meno	Jednotka	Popis
J	Joules	J	SI unit of energy
cal	Calories	cal	Small calorie; 1 cal = 4.184 J
kcal	Kilocalories	kcal	Dietary calorie; 1 kcal = 4,184 J (note: food labels use kcal but call it "calories")

How to Joules to Calories

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11 calorie (small) = 4.184 joules
21 Calorie (food/kcal) = 4,184 joules
3cal = joules ÷ 4.184
4kcal = joules ÷ 4,184

Worked Examples

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Example 1

Given:4,184 joules

Výsledok:1,000 calories = 1 kcal (food Calorie)

Example 2

Given:1,000,000 joules

Výsledok:239.0 kcal

Example 3

Given:100 joules

Výsledok:23.9 calories

Real-World Applications

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🏗️

Converting food nutritional energy to physics units

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Understanding exercise energy expenditure in scientific contexts

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Comparing fuel energy content (petrol, coal, food)

Joules to Calories Reference

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Joules	cal (small)	kcal (food Cal)
1	0.239	0.000239
100	23.9	0.0239
1,000	239	0.239
4,184	1,000	1.000
100,000	23,900	23.9
1,000,000	239,000	239.0

Frequently Asked Questions

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What is the difference between calories and kilocalories?

1 kilocalorie (kcal or food Calorie) = 1,000 small calories. Food labels use kcal but write "calories" — always clarify which unit is meant.

How many joules in a food calorie?

1 food Calorie (kcal) = 4,184 joules. A 2,000 kcal diet = 8,368,000 joules of energy.

Why do scientists use joules?

Joules are SI units (international standard). Calories are historical and vary slightly by definition. Science uses joules; nutrition uses kcal.

References

›International Table calorie — NIST

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Calories vs Joules

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Reviewed October 2026

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