Health

Dead Space Calculator

Calculate VD/VT ratio using the Bohr equation.

PaCO₂ (mmHg)

PeCO₂ (mixed expired) (mmHg)

Tidal Volume (mL, optional)

VD/VT Ratio—

Dead Space Volume—

Interpretation—

VD/VT = (PaCO₂ − PeCO₂) / PaCO₂
Normal: 0.20–0.40