Cardiac Output Calculator

Your details

Pick how to find cardiac output: the simple product, the clinical Fick oxygen method, or a reverse solve.
Resting or measured heart rate in beats per minute.
bpm
Blood ejected by the left ventricle per beat. A typical adult value is 60-100 mL.
mL
Used for cardiac index and stroke volume index, which adjust output for body size.
cm
kg
Cardiac outputNormal cardiac index
4.9L/min
Cardiac index2.57L/min/m²
Stroke volume70mL
Heart rate70bpm
Stroke volume index36.7mL/m²
Cardiac output4,900mL/min
Body surface area1.91m²
2.57 L/min/m²
Low<2.5Normal2.5-4High4+

Cardiac output is about 4.9 L/min.

  • The heart moves about 4.9 litres of blood every minute (4,900 mL/min).
  • Cardiac output rises with exercise as heart rate and stroke volume increase together, and can climb four to five fold in trained athletes.
  • Indexed to your body size the cardiac index is 2.57 L/min/m², the normal resting band is 2.5 to 4.0.

Next stepCompare against the 4 to 8 L/min resting reference, and discuss any abnormal value with a clinician.

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