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Joules to Calories Converter

Convert joules to calories and calories to joules instantly. Bidirectional energy converter with formula and common values.

J

Calories

1,000.0011

cal

4184 J = 1,000.0011 cal

cal = J × 0.239006

How to Convert Joules to Calories

Multiply the energy value in joules by 0.239006 to get the equivalent in thermochemical calories. The joule is the SI unit of energy, while the calorie originated in heat measurement. One calorie is defined as exactly 4.184 joules, making the inverse factor 0.239006.

Conversion Formula

  • Joules to Calories: cal = J × 0.239006
  • Calories to Joules: J = cal ÷ 0.239006

Common Conversions

JoulesCalories
5011.9503
25059.7515
500119.503
1,000239.006
4,1841,000.0
10,0002,390.06
50,00011,950.3

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FAQ

How many calories are in one joule?

One joule equals approximately 0.239006 calories (thermochemical). This means roughly 4.184 joules make up one calorie.

What is the difference between a calorie and a Calorie?

A lowercase calorie (cal) is the amount of energy needed to raise 1 gram of water by 1°C. An uppercase Calorie (Cal or kcal), used on food labels, equals 1000 small calories.

Why are joules and calories both used for energy?

Joules are the SI standard for energy used in physics and engineering. Calories remain common in nutrition and chemistry because they relate directly to heating water, which is intuitive for those fields.

How do I convert 500 joules to calories?

Multiply 500 by 0.239006. So 500 J = 119.503 cal.