Table 1.

Predictive equations

Equation	Calculation (kcal/day)
ACCP[17]	BMI (weight in kg/height in meters squared) < 25: Actual body weight in kg × 25
	BMI ≥ 25: Ideal body weight in kg × 25
Harris-Benedict[16]	Male: 66.473 + [13.7516 × weight (kg)] + [5.003 × height (cm)] – [6.755 × age (y)]
	Female: 655.0955 + [9.5634 × weight (kg)] + [1.8496 × height (cm)] – [4.6756 × age (y)]
Mifflin-St Jeor[18]	Male: [10 × weight (kg)] + [6.25 × height (cm)] − [5 × age (y)] + 5
	Female: [10 × weight (kg)] + [6.25 × height (cm)] − [5 × age (y)] − 161
Penn State[20]	2003a: 0.85 (Harris-Benedict equation) + (175 × Tmax) + (33 × Ve) – 6433
	2003b: 0.96 (Mifflin-St Jeor) + 31 (Ve) + 167 (Tmax) – 6212
Ireton-Jones[19]	Mechanically ventilated: 1784 – [11 × age (y)] + [5 × weight (kg) + (244, if male) + (239, if trauma present) + (840, if burn present)]
	Spontaneously breathing: 629 – [11 × age (y)] + [25 × weight (kg)] − 609 (when BMI > 27)
Faisy-Fagon[15]	[8 × bodyweight (kg)] + [14 × height (cm)] + [32 × minute ventilation (l/min)] + [94 × body temperature (°C)] – 4834

ACCP: American College of Chest Physicians; BMI: Body mass index; T_max: Maximum body temperature in past 24 hours (°C); Ve: Volume of exhaled gas (L/min).