Penn State Equation (ventilated REE)
Penn State equation for resting metabolic rate in mechanically ventilated critically ill adults (Mifflin REE + Tmax + minute ventilation); auto-selects the standard vs 2010-modified form by BMI and age.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Weight
- 70 kg
- Height
- 175 cm
- Age
- 40 yr
- Sex
- male
- Maximum temperature in prior 24 h
- 38.5 °C
- Minute ventilation
- 9 L/min
Result: Penn State RMR 2031 kcal/day — standard (2003b) form (BMI 22.9, age 40).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Standard (2003b)
- RMR = Mifflin × 0.96 + Tmax(°C) × 167 + Ve(L/min) × 31 − 6212. Mifflin uses actual body weight; Tmax = max temp prior 24 h.
- Modified (2010)
- When BMI ≥ 30 AND age ≥ 60: RMR = Mifflin × 0.71 + Tmax × 85 + Ve × 64 − 3085. Obese patients under 60 still use the standard form.
What you enter
- Weight
- Height
- Age
- Sex
- Maximum temperature in prior 24 h
- Minute ventilation
How this is calculated
Frankenfield D, Smith JS, Cooney RN. Validation of 2 approaches to predicting resting metabolic rate in critically ill patients. JPEN J Parenter Enteral Nutr. 2004;28(4):259-264. Modified: Frankenfield DC, et al. J Am Diet Assoc. 2009;109(9):1564-1569. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.