After doing several searches here and not finding anything, then sourcing back to my Building Trades handbook (From the International Correspondence School, Scranton, PA, circa 1942) for a formula for calculating the length of one side of a regular octagon, I thought I'd share the results for anyone else wondering if there is a simple formula or multiplier. This formula has also been verified via Autocad on several size octagons.

This is designed for regular octagons only, meaning width and height are equal in size. Multiply the overall length of one side x .41667, and this will net you the length of each side.

Helpful if necessary to calculate Fypon or other trim material for octagon windows, which of course I'd find the length and add enough to cover the mitre cuts of your trim material.

John

This is designed for regular octagons only, meaning width and height are equal in size. Multiply the overall length of one side x .41667, and this will net you the length of each side.

Helpful if necessary to calculate Fypon or other trim material for octagon windows, which of course I'd find the length and add enough to cover the mitre cuts of your trim material.

John

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