When finding width (aka diameter) of a circle, you multiply by pi (3.14) to reflect circumference but this is not the case with “Flat Width” of a condom. Please see below images using a toilet paper core for reference.
This may not be exact science as we don’t take into consideration the thickness of the TP core but we try to make it as simple as possible for the average readers looking to find the right size condom.
It is easier to lay a condom flat for measurement than any other way so it helps minimize error on our readers behalf. Try this method yourself and let us know what you find?
Trying to find the perfect fitting condom can be challenging. Here is a great informative Condom Size Chart we have found that helps take the guesswork out of finding the right sized condom for you.