Stroke Volume Calculator
Stroke volume is the blood ejected per beat. Enter cardiac output and heart rate; add BSA for the stroke volume index.
Stroke volume formula
Stroke volume (mL) = cardiac output (L/min) × 1000 ÷ heart rate. It can also be measured as end-diastolic volume minus end-systolic volume. The stroke volume index is stroke volume divided by BSA.
Normal stroke volume
| Measure | Normal |
|---|---|
| Stroke volume | 60–100 mL |
| Stroke volume index | 33–47 mL/m² |
Frequently asked questions
How do you calculate stroke volume?
Divide cardiac output by heart rate: stroke volume (mL) = cardiac output (L/min) × 1000 ÷ heart rate. It also equals end-diastolic minus end-systolic volume.
What is a normal stroke volume?
About 60–100 mL per beat; the stroke volume index (per m² of body surface area) is roughly 33–47 mL/m².
What is stroke volume index?
Stroke volume divided by body surface area, which adjusts stroke volume for patient size.
Educational tool. These calculators are for study and RCIS exam preparation only — not for clinical decision-making or patient dosing. Always follow institutional protocols and verify with a qualified clinician.