Calories
Science: KS3, topic 3.1.13
Calories
What people call a calorie is technically a kilocalorie. So '1,000 calories' refers to 1,000 kcals.
Calories and joules
- One kilocalorie is equal to 4.2 kJ or 4,200 J of energy.
Average male and female intake
- The average woman needs 2,000 kcal (8,400 kJ) per day.
- The average man needs 2,500 kcal (10,500 kJ) per day.
Test yourself on Calories
How many joules are in a kilocalorie?
Select the true statement in each pair.
A cereal bar contains 420 J of energy. 1 kcal is equal to 4,200 J. How many kilocalories does the cereal bar contain?