Calculate port diameter, total area, or number of ports for an aero port setup from any two inputs with inches, feet, cm, or meters.
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Aero Port Area Formula
The aero port area calculator uses the area of a circle multiplied by the number of ports. It treats each aero port as a circular opening.
- A = total port area
- N = total number of ports
- D = diameter of one port
- pi = 3.14159
To solve for port diameter when total area and number of ports are known, the formula is rearranged as:
To solve for the number of ports when total area and diameter are known, the formula is rearranged as:
The calculator lets you enter any two values and solves for the missing one:
- Total area: calculated from the port diameter and number of ports.
- Port diameter: calculated from the desired total area and number of ports.
- Number of ports: calculated from the desired total area and diameter of each port.
Internally, diameter values are converted to inches and area values are converted to square inches before the formula is applied. The result is then converted back to the unit you selected.
Common Aero Port Areas by Diameter
The table below shows the area of one round aero port for common diameters. Total area equals the single-port area multiplied by the number of ports.
| Port Diameter | Area of One Port | Area of Two Ports | Area of Four Ports |
|---|---|---|---|
| 2 in | 3.14 sq in | 6.28 sq in | 12.57 sq in |
| 3 in | 7.07 sq in | 14.14 sq in | 28.27 sq in |
| 4 in | 12.57 sq in | 25.13 sq in | 50.27 sq in |
| 6 in | 28.27 sq in | 56.55 sq in | 113.10 sq in |
| 8 in | 50.27 sq in | 100.53 sq in | 201.06 sq in |
Example Calculations
Example 1: Find total area
You have 2 aero ports, and each port has a diameter of 4 inches.
The total aero port area is about 25.13 square inches.
Example 2: Find port diameter
You want a total port area of 50 square inches using 4 identical aero ports.
Each aero port should have a diameter of about 3.99 inches.
FAQ
Is aero port area the same as port length?
No. Port area is the size of the circular opening. Port length is the physical length of the tube or flare assembly. This calculator only finds circular opening area, diameter, or number of ports. It does not calculate tuning frequency or port length.
Should the diameter include the flared lip?
Use the effective inside diameter of the port opening, not the outside diameter of the flare. The air flows through the inside opening, so the inside diameter is the value that belongs in the area formula.
Can the number of ports be a decimal?
The formula can return a decimal value for the number of ports, but a real design normally needs a whole number of ports. If the result is not close to a whole number, adjust the diameter or total target area and calculate again.
