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.

## Hydraulic Radius Definition

A hydraulic radius is defined as the ratio of the cross section area to the wetted perimeter of a hydraulic piston.

## How to calculate hydraulic radius?

How to calculate a hydraulic radius?

**First, determine the cross-sectional area.**Measure or calculate the cross-sectional area.

**Next, determine the wetted perimeter.**Measure or calculate the wetted perimeter.

**Finally, calculate the hydraulic radius.**Using the formula above, calculate the hydraulic radius.

## FAQ

**What is a hydraulic radius?**

A hydraulic radius is defined as the ratio of the cross section area to the wetted perimeter of a hydraulic piston.