# Hydraulic Radius Calculator (+ Wetted Perimeter)

Enter the cross sectional area of a hydraulic cylinder into the calculator below to calculate the hydraulic radius and the wetted perimeter.

## Hydraulic Radius Formula

The following equations are used to calculate the hydraulic radius and wetted perimeter.

R = A / P

• Where R is the hydraulic radius
• A is the cross sectional area
• and P is the wetted perimeter.

In this case, we are assuming that the fluid is moving through a piper that is completely full. This means that the wetted perimeter is simply equal to the circumference of the piper, which can be calculated using equations for a circle.

Typically the circumference of a circle is calculated using the radius, but since we are only given the cross sectional area, the radius must be inferred from that information. This can be done by re-arranging the formula.