In "stay-on" bath & body or personal care applications, like lotions, we recommend 2% or less of fragrance oil by weight. In "wash-away" applications, such as soap, we recommend 3-4% fragrance oil by weight. 2% is equivalent to about 1/3 of an ounce per pound. And 3% is about half an ounce per pound. However, some fragrance oils are not suitable for stay-on or wash away bath and body applications. Please refer to the IFRA sheet for each fragrance, by contacting our customer service team.