This calculator is based on fragrance load.
Fragrance Load is the percentage of fragrance oil relative to the weight of wax only. If your finished candle has a net weight of 220g and your chosen fragrance load is 10%, then your candle would contain 20g of oil and the remaining 200g would be your wax.
Fragrance Content is the percentage of fragrance oil relative to your finished candle weight. Therefore if your finished candle has a net weight of 220g and your chosen fragrance content is 10%, then your candle would contain 22g of oil and the remaining 198g would be of your wax.