Calculating the amount of fabric needed for your bias binding can be tedious.
I always have to look up sewing formulas and work out the math, usually while sitting in the car outside the fabric store. By having a little excel worksheet here online, hopefully it'll make it that much faster next time.
Just enter the appropriate numbers in the 3 highlighted fields.
Calculations are based on the "Magical Math Formula" tutorial found at Sew4Home. The math is the same as above, but a lady can go cross eyed trying to read through that and do the math on a small phone screen while sitting in the car. ;)