# A fast-food item contains 544 nutritional calories. How do you convert this energy to joules?

##### 1 Answer
Jun 11, 2016

By using the conversion factor of 4.184 Joules per calorie.

#### Explanation:

It is important to realize that when the term 'nutritional calorie' is used, they mean kilocalorie (= $1000$ calories).

It is known that 1 calorie is approximately $4.184$ Joules.

This means that 1 kilocalorie = $1000 \cdot 4.184$ Joules = $4184$ Joules

Your fast-food item contains 544 kilocalories which compares to: $554 \cdot 4184$ = $2317936$ Joule = $2.32 \cdot {10}^{6}$ Joule

Note that the exact conversion factor for calories to Joules depends on temperature and atmospheric pressure