Gorlin Formula Calculator

Written by Great Medico

Updated September 24, 2026 •2 min read

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Cardiovascular numbers become useful only when the equation behind them is clear. Gorlin Formula Calculator turns the specific measurements in this tool into a focused hemodynamic or risk estimate.

What this calculator does

Gorlin Formula Calculator uses Cardiac output, Heart rate, Aortic mean gradient, Systolic ejection period, Mitral mean gradient, and Diastolic filling period to calculate aortic and mitral valve areas. It is built around the exact fields displayed in this plugin rather than a generic version of the topic. Where supported, it also shows Mitral valve area so the primary result is easier to place in context. Cardiovascular formulas are sensitive to measurement technique and clinical context. A mathematically correct output can still be misleading if the input was obtained under a different physiologic condition, with a different assay, or outside the population for which the score was developed.

How to use it

Enter or select Cardiac output, Heart rate, Aortic mean gradient, Systolic ejection period, Mitral mean gradient, and Diastolic filling period. Use the units offered by the calculator and choose the option that matches the actual clinical or timing situation. Check date entries and laboratory units before relying on the output. When the formula combines measurements, use values obtained under the same assessment or physiologic conditions whenever possible.

How the calculation works

The Gorlin calculation converts cardiac output to milliliters per minute and divides flow by a constant, heart rate, the appropriate ejection/filling period, and the square root of the mean transvalvular gradient. The aortic calculation uses the 44.3 constant and systolic ejection period; the mitral calculation uses 37.7 and diastolic filling period. Both valve areas are reported.

Example

Using the sample values prefilled in this calculator, the primary result is 0.773 cm² (Aortic valve area) and Mitral valve area is 1.2 cm². This worked example shows how the plugin’s own default inputs flow through the implemented method; replace them with the correct patient, laboratory, imaging, or personal values before interpreting a result.

How to interpret the result

Read the output as aortic valve area generated by this specific formula or score. The number is most useful when compared with the clinical context and, when appropriate, serial measurements or the current guideline pathway for the condition. A boundary value should not be overinterpreted as a sudden change in physiology.

Limitations and notes

Cardiovascular formulas are sensitive to measurement technique and clinical context. A mathematically correct output can still be misleading if the input was obtained under a different physiologic condition, with a different assay, or outside the population for which the score was developed.