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Calculator For Figuring the Cross Sectional Area of Ports with no Choke Point From RPM

Todays date is 4/24/2025

Cross Sectional Area equals the minimum cross sectional area of your intake port. (length times width)
This is most times your push rod area, but not always.

For a more accurate calculation try Larry Meaux's Pipe Max.
His program is excellent and will provide a lot of info.
Pipe Max

Enter your Max RPM you Want

Input you Bore/Stroke and RPM please

To Figure Your Minimum Cross Sectional Area (CA) of your Intake Port

Make all measurements in inches, and convert fractions to decimal numbers. Examples:
1-1/4 = 1.25 2-3/16 = 2.1875	>> >>	(1 4) + 1 (3 16) + 2

Rectangular/Square runners		To calculate the cross-sectional area of rectangular and square runner profiles, measure the width and the height of the runner, and multiply the two together. Measure in inches!
Runner width:
Runner height:
Runner Area:	square inches (calculated)

Area = Width X Height

To measure Round Ports

Back to Calculators

Index

Round runners		To calculate the cross-sectional area of round runners, measure the diameter of the runner, divide by two, multiply the result by itself, then multiply that by 3.14. Measure in inches!
Runner diameter:
Runner Area:	sq inches (calculated)

Area = (Diameter 2)² X 3.14

Enter RPM:
Enter Bore:
Enter Stroke: