Energy
Applied Science: BTEC Level 3 National Extended Diploma, topic 3.6.4
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 Energy
How many joules are in a kilocalorie?