This is the most frequently question asked and rightfully so!! Unfortunately there's no standard calculation when mixing pigments due to the numerous applications, and mediums that our pigments can be used with. I.E. Automotive, Epoxy, Resin, Slime, Candles, Soaps, Fishing Lures, Woodworking, Pen Blanks, Acrylic, Varnish, Clay, Grout, Flooring, Countertops, Cosmetics, Fingernail Polish, etc. the list goes on.