Free pulmonary and cardiopulmonary calculators for clinicians, students, and patients — each paired with the formula, a worked example, an animated diagram, and plain-language interpretation.
Reshape the loop live — 8 disease presets
14 patterns from normal to upper airway obstruction
Watch O₂ and CO₂ cross the membrane in real time
Shift the Severinghaus curve with 6 sliders
Interpret gases, check compensation, drill practice questions
The equation with every variable defined and units shown.
Step-by-step arithmetic using real clinical numbers.
Animated illustration of the underlying physiology.
Plain-language explanation of what the result means at the bedside.
How oxygen moves from lung to blood
13 calculatorsBreathing, pressures, and lung mechanics
11 calculatorsSpirometry and lung volume relationships
13 calculatorsPressures and flow through the heart & lungs
7 calculatorsPoint-based clinical scoring tools
13 calculatorsCommon clinic and bedside tools
8 calculatorsNewborn and child breathing assessments
5 calculatorsFoundational equations and extras
3 calculators