Cardiac Output (Fick) Calculator

Calculate cardiac output using the Fick principle from oxygen consumption and arteriovenous oxygen difference.

Medical Disclaimer

This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.

Inputs

VO2 (O2 consumption)

mL/min

Hemoglobin

g/dL

Arterial O2 saturation (SaO2)

Mixed venous O2 saturation (SvO2)

Arterial PaO2

mmHg

Mixed venous PvO2

mmHg

Body surface area

m²

Tab to move between fields

Results

Cardiac Output

5.56 L/min

Cardiac Index

2.93 L/min/m²

Arterial O2 Content (CaO2)18.68 mL/dL

Venous O2 Content (CvO2)14.19 mL/dL

A-V O2 Difference4.49 mL/dL

O2 Delivery (DO2)1,039 mL/min

O2 Extraction Ratio24.1%

How to Use This Calculator

Enter oxygen consumption (VO₂ in mL/min), hemoglobin (g/dL), and arterial O₂ saturation (SaO₂ %).
Set mixed venous O₂ saturation (SvO₂ %), arterial PaO₂, mixed venous PvO₂, and body surface area (m²).
Review Cardiac Output (L/min), Cardiac Index (L/min/m²), CaO₂, CvO₂, and A-V O₂ Difference.
Normal resting CO is 4–8 L/min; CI < 2.2 L/min/m² suggests cardiogenic shock.

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