To ensure you get an accurate measurement place the quarter round on the wall.
Installing quarter round around door trim.
How to install quarter round around door.
Cutting a return on quarter round trim.
Double check the wall measurements then carefully cut the quarter round to the size you need.
Sometimes you have to cut smaller pieces of molding to fit shorter walls or work around door frames.
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Not all rooms are perfectly rectangular.
Both quarter round and shoe moldings are long flexible lengths of wood such as hemlock oak or pine mdf or even polystyrene.
Both trim moldings start as long round dowels that are then rip cut and milled into their respective shapes.
Some doorstop molding has a built in quarter round edge but if you have a square doorstop trim around the exterior side of the door frame or doorjamb with quarter round and your door will.