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How to determine what size pipe you are looking at

The following is a simple way to configure pipe size.

  1. Wrap a piece of string around the fully exposed pipe in question one time.
  2. Measure the length it takes to wrap around the pipe once.
  3. Match your measurement with the lengths listed below to get a pipe size.




 
Nominal Pipe Size
Approximate String Length in Inches
Copper Pipe
Galvanized
PVC Pipe
1/2"
2"
2 5/8"
2 5/8"
5/8"
2 3/8"
na
na
3/4"
2 3/4"
3 5/16"
3 5/16"
1"
3 1/2"
4 1/8"
4 1/8"
1 1/4"
4 5/16"
5 3/16"
5 3/16"
1 1/2"
5 1/8"
6"
6"
2"
6 3/4"
7 7/16"
7 7/16"

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