Cardiac output calculator

Patient and haemodynamics

Height · cm

Weight · kg

MAP · mmHg

CVP · mmHg

Enter saturations as percentages and pO₂ in kPa.

VO₂ · mL/min

Haemoglobin · g/dL

Arterial gas

SaO₂ · %

PaO₂ · kPa

Venous gas

Venous O₂ sat · %

PvO₂ · kPa

Venous sample

CI 2.5–4.0 L/min/m² SV 60–100 mL/beat SVR 800–1200 dyn·s/cm⁵ SVRI 1970–2390 dyn·s/cm⁵/m²

LiDCO adult ranges. Published ranges vary; these are orientation cues, not treatment targets.

Method and formulas

Fick: CO = VO₂ / ((CaO₂ − CvO₂) × 10)

CaO₂ = 1.34 × Hb × (SaO₂ / 100) + 0.0233 × PaO₂

CvO₂ = 1.34 × Hb × (SvO₂ / 100) + 0.0233 × PvO₂

pO₂ is entered in kPa. The dissolved-oxygen coefficient is 0.0031 when pO₂ is entered in mmHg.

Echo: SV = π × (LVOT diameter / 2)² × VTI; CO = SV × HR / 1000.

BSA = √(height × weight / 3600); SVR = 80 × (MAP − CVP) / CO.