## The Diameter Tape Measure: A Calculator Without Batteries

Why do we call the diameter tape measure a calculator? Because when you wrap it around the circumference of a pipe or a post, it “calculates” the outside diameter instantaneously. It’s a calculator that never slows down because it doesn’t use batteries. The special scale is in inches or millimeters, and it is stretched out by the factor of pi (3.14159). That’s how it does it for you.

## How Would You Survive Without Your Pipe Diameter Tape Measure?

Your pipe diameter tape measure is probably the most valuable and simplest tool in your toolbox. It will tell you the outside diameter of a pipeline (or your arm) when you wrap it around the circumference. What if you lost your pipe tape? How would you measure the diameter of a pipe or any round object?

• Use a regular tape measure, if it is flexible enough to wrap around the pipe. A carpenter’s tape is made to stay stiff, so it won’t work in this case. Since the end hook won’t let you lay the zero mark against the pipe, you would have to start at the 1 or 2 inch mark. Read the circumference and divide by 3.14159. That’s a lot of trouble.
• Use an expensive caliper, transfer the reading to a measuring tape, perhaps, then divide by pi. That’s a clumsy way of doing it.
• Get a real expensive micrometer. Since they have a narrow range of measuring (1 inch), it would have to be a certain size to begin with. Then measure the diameter directly. Reading the markings on a micrometer is not the easiest thing to do. You have to read the shaft measurement, then add the tumbler measurement to it.

So, hang on to your pipe diameter tape measure and it will save you a lot of trouble.

## Give A Diameter Tape Measure For Christmas

A diameter tape measure can save you a lot of time and frustration when you want to find the OD (outside diameter) of a pipe, post, or tree. This special tape has the inch scale (or metric scale) stretched out by a factor of pi (3.14159). So, if you wrap it around the pipeline, you will not see the “circumference”. You will see its diameter. You don’t need to divide your answer by 3.14159.

## Here’s the Secret About a Pipe Measuring Tape

If you have to find the length of a pipe, that’s easy. But what about the outside diameter of a pipe?  What if you can’t just measure the diameter at the end? What if the pipe doesn’t have its ends exposed. It is part of a piping system, or a pipeline. How can you fine the OD, or outside diameter?

The secret is finding the right pipe measuring tape. What is it called?

• Diameter Tape
• Pipe Tape
• Pipe Diameter Tape
• Pi Tape
• OD Tape
• Outside Diameter Tape
• Circumference Tape (a misnomer, but they are sometimes called this)

To use one, all you do is wrap it around the pipe, and read off the diameter. You don’t need to divide by pi (3.14159).