Dietary energy intake and expenditure are described in kilocalories or kiloJoules.
NOTE: Other forms of energy units are converted in 40.02.09 (above).
Unit of Energy
Symbol
Amount
calorie
c
4.184 Joules
Calorie (or kilocalorie)
C or kcal
1,000 calories, or 4,184 Joules or 4.184 kJ
Joule
J
0.239 calories
kiloJoule
kJ
1,000 Joules or 0.239 kcal
where:
• 1 calorie indicates the amount of energy required to raise the temperature of 1 gram of water 1°C under defined conditions of starting temperature and atmospheric pressure.
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