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This came about b/c I was selling some grosgrain rolls and wanted to provide an approximate yardage so folks could see what a good deal (or not) it was.

I also have run out once when binding a...

I thought the second one was more clutzy as well, although they give exactly the same result. When I punched it in to Ecxel, I used the fmla with the radius, then immediately miscalculated because I...

For the DIY or gear maker, it's nice to know how much gross grain, or tape, or whatever else is left on a roll, without unwinding it. I found these two formulas online and they agree with each...