# How can calories be converted to kilocalories?Our book states that: 1 cal = 4.186 J and 1 kcal = 4186 J. Is this correct?

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### 3 Answers

This question is basically about the meaning of the prefix "kilo." Kilo is used to represent a quantity that is 1000 or 10^3 times the basic unit. Here the basic unit is calorie. Kilocalorie is equal to 1000 calories, just like *kilo*meter is equal to represent 1000 meters.

To convert calories to kilocalories you have to divide the number of calories by 1000.

X calories = X/1000 kilocalories.

Your book has it right that 1 cal = 4.186 J and 1 kcal = 4186 J.

As you will notice 4186 = 4.186*1000, just as 1 kcal = 1000 cal.

The rule for conversion is 1 cal = 1/1000 kcal and 1 kcal = 1000 cal.

A calorie is a unit of energy, or heat, needed to raise the temperature of 1 gram of water by 1 degree centigrade. "Kilo" means 1000 and therefore, a kilocalorie is 1000 calories. A kilocalorie also is known as a dietary calorie, or the amount of heat needed to raise the temperature of 1 kg of water by 1 degree centigrade.

If you are interested in the conversion only, divide the number of calories by 1000. For example, 500 calories = 0.5 kilocalories.

**http://www.convertunits.com/from/kilocalories/to/calories**

This site will be helpful. you just enter the numbers and it will convert them, and it will even teach you if u continue reading

Hope that helps