**To find it, measure around the circumference of the pipe with flexible measuring tape. Divide the circumference by pi, or about 3.14159. For example, if the circumference is 12.57 inches (319 mm), you would divide by pi, and get an outside diameter of about 4 inches (100 mm).**

## How to Determine Pipe Diameter?

Pipe diameter is an essential measurement when it comes to plumbing, and there are several ways to accurately determine the correct diameter for a given pipe.

In general, the larger the pipe diameter, the greater the flow capacity, so it is important to get the size right. Here is a guide on how to determine pipe diameter for your next project.

The first step in determining the pipe diameter is to measure the inside diameter (ID) of the pipe. This can be done using a ruler or a measuring tape.

If the pipe is curved, you can use a flexible ruler or a flexible tape measure to get an accurate measurement. Once you have the ID of the pipe, you can then determine the outer diameter (OD) by adding twice the thickness of the pipe wall.

This will give you a good estimate of the pipe diameter. Another method to determine the pipe diameter is to use a caliper. This tool is designed to measure the outside diameter of the pipe.

This method is more accurate than measuring with a tape measure but you may need to add an additional allowance of 1/8” to 1/4” to the measurement. If you are working with plastic pipes, you can use a pipe sizing chart to determine the pipe diameter

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