How to Determine Your Pipe SizeUsing The String Method

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First off, check the pipes themselves. Oftentimes the pipe’s size will be labeled right on the side.

If your pipe isn’t labeled, you can use the string method. It’s easy – all you need is a length of string and a ruler.

Now take your string and wrap it once around your pipe. Mark off with your thumb the length of string needed to encircle the pipe.

Then, simply measure the length of string you marked off. As you can see, this pipe had a circumference of 3”.

Note that your pipe’s size does not reflect its inside or outside diameters. Use these tables to find your pipe’s size by its circumference and construction material.

Copper Pipe or PEX tubing2.75″ (70mm) = 3/4″ pipe3.53″ (90mm) = 1″ pipe4.32″ (110mm) = 1 1/4″ pipe5.10″ (130mm) = 1 1/2″ pipe

Steel Pipe or PVC Plastic Pipe3.25″ (83mm) = 3/4″ pipe4.00″(102mm) = 1″ pipe5.00″(127mm) = 1 1/4″ pipe6.00″(152mm) = 1 1/2″ pipe

Flexible (usually black) Polyethylene Pipe2.96-3.33″ (75-85mm) = 3/4″ pipe3.74-4.24″ (95-108mm) = 1″ pipe4.90-5.57″ (124-141mm) = 1 1/4″ pipe5.70-6.28″ (145-160mm) = 1 1/2″ pipe

You’re done! Now that you know your pipe size you’re ready to attach any system with compatible connectors.

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There you can also find more instructional guides like how to determine your well pump’s flow rate, how to sanitize your well water system, and more.

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