Dead Space Calculator

Free calculate physiological dead space (VD/VT ratio). This is an educational tool only - always consult a healthcare provider.

Measurements

Results

Enter measurements to calculate dead space

About Dead Space

  • • Bohr equation: VD/VT = (PaCO₂ - PECO₂) / PaCO₂
  • • Normal: 0.2-0.3 (20-30%)
  • • Increased in: COPD, PE, ARDS, low cardiac output
  • • Higher ratio = less efficient ventilation