If anyone knows of a way to post an excel file on here, I’ve got a great reel fill calculator (not really mine; I stole if from somewhere ). It works by entering the spec’s from any given reel (diameter line and capacity). From there, you can enter the diameter of your backer, lead, and leader and make adjustments to each length to achieve 90-100% capacity of the reel. It works great! I use it for setting up everything from mono to braid, lead, copper, and stainless wire rods. It’s a real life saver when setting up salmon rods, or even walleye lead core setups. If there is no way to post excel files on here, you can send me a PM with your e-mail address and I can mail it to you.