Calculate minute ventilation (VE) from respiratory rate and tidal volume, with a clear guide to normal values, dead space, and CO2 clearance.
Formulas and Calculations
Ideal Body Weight (IBW) Calculator
Enter height and sex to calculate ideal body weight (IBW), plus a clear guide to predicted body weight and lung-protective ventilation.
Glasgow Coma Scale (GCS) Calculator
Calculate a Glasgow Coma Scale (GCS) score from eye, verbal, and motor response, plus a clear guide to what the total means clinically.
Mean Arterial Pressure (MAP) Calculator
Calculate mean arterial pressure (MAP) from systolic and diastolic BP, plus a clear guide to normal ranges and what MAP means clinically.
Arterial Blood Gas (ABG) Calculator
Use our accurate arterial blood gas (ABG) calculator tool to quickly analyze ABG results for learning, analysis, and interpretation.
Mean Arterial Pressure (MAP): Calculation and Key Concepts
Learn what mean arterial pressure (MAP) is, how to calculate it, normal values, and why it matters for perfusion and respiratory care.
PaO2/FiO2 Ratio (P/F Ratio): Calculation and Clinical Uses
Learn how the PaO2/FiO2 ratio (P/F ratio) assesses oxygenation, its calculation, interpretation, and role in ARDS and respiratory care.
Dead Space/Tidal Volume Ratio (VD/VT): An Overview (2026)
Learn what the dead space to tidal volume ratio (VD/VT) is, how it’s calculated, and why it matters in respiratory care and ventilation.
Respiratory Therapy Formulas, Calculations, and Equations
Explore a comprehensive list of respiratory therapy formulas and calculations to improve clinical accuracy and decision-making.
Anion Gap: Overview, Calculation, and Practice Questions
Learn what the anion gap is, how it’s calculated, and why it matters in diagnosing metabolic acidosis and guiding respiratory care.
Alveolar Gas Equation: Overview and Calculation (2026)
Learn what the alveolar gas equation is, how it’s calculated, and why it’s essential for assessing oxygenation and lung function.
Alveolar-Arterial Gradient (A-a): Overview and Calculation
Learn how to calculate and interpret the alveolar-arterial (A-a) gradient to assess oxygen transfer and identify causes of hypoxemia.
How to Calculate Pack Years: A Step-by-Step Guide (2026)
Learn how to calculate pack years to assess smoking history and its impact on lung health with this step-by-step guide.
Respiratory Formulas and Calculations Practice Questions
Learn respiratory therapy math, calculations, and formulas in this guide featuring practice questions for exam prep and clinical practice.
Winters’ Formula for Metabolic Acidosis (Expected PaCO2)
Learn how Winters’ formula calculates expected PaCO2 to assess respiratory compensation in metabolic acidosis, guiding clinical decisions.
How to Calculate How Long an Oxygen Tank Will Last (2026)
Learn how to calculate oxygen tank duration with our step-by-step guide for accurate cylinder planning and safety during oxygen therapy.