Calculating a material waste factor WOODWEB
If you're adding on a percentage to your net material requirement for costing, don't add a "waste" factor or you'll be making a mistake I see lots of guys do. If your waste factor is 20%, 25%, 30%, 35%, 40%, 45%, or 50%, add 26, 34, 44, 55, 67, 82, and 100 percent respectively, to your net material requirement to get your actual material costs.