I use the 0.5 oz EO PPO rate on SoapCalc for all soaps. Not for all EO's, however, I use half that rate for irritating EOs such as cinnamon(cassia) and clove. I tend to use my citrus EOs in liquid soap because they stick fine there, and I had a bunch I needed to use. I happen to love the scent of citrus in dish and laundry soap, so that is a good thing.