The ESV Calculator helps determine the End-Systolic Volume (ESV), which is the amount of blood remaining in a heart’s ventricle after it has contracted. This measurement is essential in cardiology for evaluating heart function, particularly in assessing conditions like heart failure, cardiomyopathy, and valve disorders.
Clinicians and researchers use ESV calculations to monitor cardiac performance, plan treatments, and interpret echocardiography or MRI results. This calculator simplifies the process by using standard medical formulas based on other known cardiac measurements such as End-Diastolic Volume (EDV), Stroke Volume (SV), or Ejection Fraction (EF).
Formula of ESV Calculator
Primary Formula:
ESV = EDV − SV
Where:
- ESV = End-Systolic Volume (mL)
- EDV = End-Diastolic Volume (mL)
- SV = Stroke Volume (mL)
This method calculates ESV directly when EDV and SV are known.
Alternate Formula Using Ejection Fraction:
If Stroke Volume is not directly available but Ejection Fraction is known:
SV = EDV × EF
Then:
ESV = EDV − (EDV × EF)
or simplified:
ESV = EDV × (1 − EF)
Where EF is expressed as a decimal (e.g., 65% = 0.65)
This is a common approach when working with diagnostic imaging data where EF is provided instead of SV.
Helpful Reference Table
This table shows estimated ESV values based on common EDV and EF values, helping users quickly interpret results without calculations.
| EDV (mL) | EF (%) | SV (mL) | ESV (mL) |
|---|---|---|---|
| 120 | 60% | 72 | 48 |
| 140 | 55% | 77 | 63 |
| 100 | 70% | 70 | 30 |
| 150 | 40% | 60 | 90 |
| 130 | 50% | 65 | 65 |
These figures provide a clear visual of how ejection fraction and volume influence ESV, supporting faster assessments in clinical or academic settings.
Example of ESV Calculator
Suppose a patient’s echocardiogram reports an End-Diastolic Volume (EDV) of 120 mL and an Ejection Fraction (EF) of 65%.
Step 1: Convert EF to decimal
EF = 65% = 0.65
Step 2: Use the simplified formula
ESV = EDV × (1 − EF)
ESV = 120 × (1 − 0.65) = 120 × 0.35 = 42 mL
Result: The End-Systolic Volume is 42 mL, meaning this amount of blood remains in the ventricle after contraction.
Most Common FAQs
ESV helps evaluate how effectively the heart pumps blood. A high ESV may suggest poor contraction or reduced cardiac function, often seen in heart disease.
Yes. If both EDV and Stroke Volume are known, you can calculate ESV using the primary formula: ESV = EDV − SV.
Not necessarily. While low ESV may indicate strong ventricular contraction, extremely low values or abnormal relationships with EDV and EF can suggest underlying issues. It should always be interpreted alongside other measurements.