Pulmonology · ICU and Critical Care

Respiratory Quotient (RQ) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

CO₂ production, VCO₂ (mL/min)

mL/min

Allowed range: 50–3000 mL/min

O₂ consumption, VO₂ (mL/min)

mL/min

Allowed range: 50–3000 mL/min

Result

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Clinical inputs

CO₂ production, VCO₂ (mL/min)Accepted range: 50 to 3000
O₂ consumption, VO₂ (mL/min)Accepted range: 50 to 3000

Primary source

AARC Clinical Practice Guideline: Metabolic measurement using indirect calorimetry during mechanical ventilation, 2004 revision & update. Respir Care 2004;49(9):1073-1079. RQ = VCO₂ ÷ VO₂; test quality is supported when RQ is consistent with nutritional intake and lies in the normal physiologic range 0.67 to 1.3 (sections 9.1.1-9.1.2). (2004)

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