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Stroke volume calculator

Calculate stroke volume from cardiac output and heart rate, plus body surface area, stroke volume index and cardiac index.

For feet, enter decimal feet: 5 ft 6 in is 5.5 ft.

Stroke volume
66.67
Cardiac output
5
Heart rate (beats/min)
75.00
Mosteller body surface area (m²)
2.000
Stroke volume index (mL/beat/m²)
33.33
Cardiac index (L/min/m²)
2.500

Estimates for information only. Not financial, medical, legal or engineering advice. See the Terms.

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How this calculator works

Stroke volume is forward blood volume per beat. Dividing cardiac output by heart rate requires matching time units. Body size is used only to produce the indexed outputs, using Mosteller BSA. In valve regurgitation, forward output may differ from the total volume ejected by the ventricle. The result is an estimate for information only and is not medical advice.

Formula

SV(mL/beat) = 1000 × CO(L/min) / HR. SVI = SV/BSA; CI = CO/BSA; BSA = √[height(cm) × weight(kg)/3600].

Worked example

At 6 L/min and 75 beats/min, SV is 80 mL. With BSA 2 m², SVI is 40 mL/beat/m² and CI is 3 L/min/m².

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Frequently asked questions

Why include height and weight?

They calculate surface area for SVI and CI, not the unindexed stroke volume.

Can heart rate be zero?

No. This calculation requires a positive heart rate and flow.

Does this measure ventricular size?

No. Volume-based imaging methods use end-diastolic and end-systolic measurements instead.

Sources

Written byAmira MansourCalculator writer. Builds and tests Mathulate calculators against published sources.
Reviewed byPriya Natarajan, RDRegistered dietitian. Checks health calculators against public health guidance.

Last updated .

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