Cardiology calculator
Clinical decision support
Cardiac output and cardiac index

Cardiac Output Calculator

Calculate cardiac output from heart rate and stroke volume, with optional cardiac index when body surface area is supplied.
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Cardiac output calculator

Use this cardiac output calculator for quick haemodynamic calculations. Enter heart rate and stroke volume; add body surface area if you want cardiac index.

bpm

mL/beat

m²

Cardiac output

6.30 L/min

Heart rate × stroke volume / 1000.

Cardiac index

3.50 L/min/m²

Cardiac output indexed to body surface area.

Clinical decision support only. Verify unusual values, follow local guidelines, and interpret calculations alongside the full clinical picture.

Equations used on this page

Cardiac output = heart rate × stroke volume / 1000. Cardiac index = cardiac output / body surface area.

Clinical notes

Cardiac output estimates depend on how stroke volume was measured and should be interpreted with perfusion, filling pressure, afterload, rhythm, and clinical context.

Cardiac index is indexed to body surface area and is most useful when BSA is reliably known.

References

Guyton and Hall Textbook of Medical Physiology: cardiac output physiology overview

These calculators are designed for clinician decision support and SEO-friendly public education. Verify results against the original method and the patient context before making decisions.