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How to Measure a Belt

Video Tutorials - October 22, 2025
How to Measure a Belt

The length of Belt is usually defined as its total length.

The dimensions of a Belt can be expressed in millimeters or inches, which is why we have divided the products on our website into two separate categories: metricBelts and inchBelts .

For Belts in inches, whether smooth or toothed, the measurements indicated on the back of the Belt to the internal lenght expressed in inches, while for metricBelts (with the prefix SP), the measurements refer to the pitch expressed in millimeters.

At this point, you have everything you need to identify the Belt on our website... but if you can't read the Belt code—for example, because it's too worn—you can measure the circumference manually.

How do you measure the development of a Belt?

To measure the length of your Belt, you can use the special measuring tool, a tape measure, or—more simply—a standard piece of packing string.

How do you calculate the length?

To determine the length of a Belt measure the EXTERNAL LENGTH manually, recording the measurement in millimeters, and then calculate the internal length or the original length using the information in the tables below.

It is important to note that for classic Belts , the internal lenght is used as the standard reference, whereas for narrow Belts , designated with the prefix SP, the pitch is typically specified.

Belts in inches

Belts in inches

Metric Belts

Metric Belts

After measuring the external length (base)—which is usually more practical and quicker to measure—simply subtract the values listed in the table from the measured value in millimeters to obtain the actual circumference.

As a general rule, the inch is used as the unit of measurement for standard Belts , but to make calculations easier, we have chosen to list all measurements in millimeters as well.

At this point, we have the metrics we need to conduct targeted research on our shop.atti.it


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