When I have a recipe that is in %, I use the soapcalc/sooz http://www.soapcalc.com/calc/SoapCalc.asp When I have a recipe that is in oz, I use The Sage http://www.thesage.com If I need to enlarge or reduce a recipe, I enter it in to whichever calc above, calculate, then reduce or enlarge it. The nice thing about soaping is that you still use between 3% and 6% FO. If you can figure that for candles, it's the same for soap only it is oils instead of wax. HTH