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Calcimator

Cardiac Output Calculator

Calculate cardiac output using the Fick equation and stroke volume method. Also estimates cardiac index and systemic vascular resistance.

Inputs

Results

Cardiac Output (Fick)

5 L/min

Cardiac Output (HR x SV)5.04 L/min
Cardiac Index2.78 L/min/m²
SVR (estimated)1,408 dynes·s/cm⁵
MAP (estimated)93 mmHg
How to Use This Calculator
  1. Enter oxygen consumption (VO₂) in mL/min from Fick measurement or estimate.
  2. Input arterial oxygen content (CaO₂) and venous oxygen content (CvO₂) in mL/dL from blood gas data.
  3. Enter heart rate in beats per minute.
  4. Review the Cardiac Output (L/min) and Stroke Volume (mL) computed via the Fick principle.
  5. Use these values alongside clinical assessment — values outside normal ranges require physician review.

How the result changes with Arterial O₂ Content (mL/dL)

Arterial O₂ Content (mL/dL)Cardiac Output (Fick)
70 L/min
120 L/min
188.33 L/min
233.13 L/min

What each input means

Oxygen Consumption (mL/min)
VO₂: total body oxygen consumption. Normal resting: 200-300 mL/min.
Arterial O₂ Content (mL/dL)
CaO₂: oxygen content of arterial blood. Normal: 18-21 mL/dL.
Venous O₂ Content (mL/dL)
CvO₂: oxygen content of mixed venous blood. Normal: 13-16 mL/dL.
Heart Rate (bpm)
Heart rate in beats per minute.
Stroke Volume (mL)
Volume of blood ejected per heartbeat. Normal: 60-100 mL.

What each result means

Cardiac Output (Fick)
Normal: 4-8 L/min.
Cardiac Index
Normal: 2.5-4.0 L/min/m².
SVR (estimated)
Normal: 800-1200 dynes·s/cm⁵.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Oxygen Consumption (mL/min) = 250, Arterial O₂ Content (mL/dL) = 20, Venous O₂ Content (mL/dL) = 15, Heart Rate (bpm) = 72 = 5 input(s) provided
  2. Calculate Cardiac Output
    Cardiac Output
    5 = 5
  3. Calculate Cardiac Output
    Cardiac Output
    5.04 = 5.04
  4. Calculate Cardiac Index
    Cardiac Index
    2.78 = 2.78

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