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Cardiac Output Calculator

Work out cardiac output instantly with clear inputs, formula shown and shareable results.

About Cardiac Output Calculator

Multiplies stroke volume by heart rate to give cardiac output, then divides by body surface area for the cardiac index.

Formula

Cardiac output

CO (L/min) = stroke volume (mL) x heart rate (bpm) / 1000; CI = CO / BSA

Worked example

With the default values below, Cardiac Output Calculator returns Cardiac output of 5.04. Change any input above and every figure here is recalculated in your browser.

Inputs used

Stroke volumeaccepts 5–250 mL
70 mL
Heart rateaccepts 20–220 bpm
72 bpm
Body surface areaaccepts 0.2–3 m2
1.8 m2

Results

Cardiac output
5.04 L/min
Cardiac index
2.80 L/min/m2
Output
5,040 mL/min

Step by step

  1. 1Values used
  2. 2Cardiac output
  3. 3Cardiac output= 5.04 L/min
  4. 4Cardiac index= 2.80 L/min/m2
  5. 5Output= 5,040 mL/min

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What is a typical cardiac output?

Around 4 to 8 L/min at rest in adults, with a cardiac index near 2.5 to 4.0 L/min/m2.

Why use cardiac index?

Indexing to body surface area allows outputs from people of different sizes to be compared.

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