Question: How to Measure Copper Pipe

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 do I know what size copper pipe I have?

Here’s how to determine pipe size by simply measuring the OD. Copper. The nominal size of copper pipe, whether supply lines or DWV, is always 1/8 inch less than the OD measurement. For example, copper pipe that measures 5/8 inch OD, is called 1/2- inch pipe.

What is the OD of 1/2 copper pipe?

Nominal Pipe Size inches O.D. I.D. Type 1/2 0.625 0.545 5/8 0.750 0.666 3/4 0.875 0.785.