How is the width of frames calculated? Mayu August 31, 2018 22:32 Updated Follow Please see below: Small Medium Large Frame width 130 - 134 mm 135 - 139 mm 140 - 145 mm Related articles What is Pupillary Distance (PD) and how can I measure it if it is not provided with my prescription? Do you offer bifocal or progressive lens options? Breakdown of Lens Index of Refraction What makes JINS special? (Video) How to find a frame's dimensions/measurements Comments 0 comments Article is closed for comments.