Respiratory Quotient by Substrate

Determine respiratory quotient (RQ) based on metabolic substrate being oxidized to assess nutritional status and overfeeding risk.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Determine respiratory quotient (RQ) based on metabolic substrate being oxidized to assess nutritional status and overfeeding risk

Each component has a specific meaning:

  • Metabolic substrate being oxidized — The metabolic substrate being oxidized recorded for the scenario being assessed.

Note: Interpret the rq by substrate result against the thresholds and context described above.

How to Use

Enter the metabolic substrate being oxidized for the scenario you are assessing. Determine respiratory quotient (RQ) based on metabolic substrate being oxidized to assess nutritional status and overfeeding risk. Use the rq by substrate result to inform your calculation.

Frequently Asked Questions