Mar 25, 2018 · Determining CBD Concentration Depending On Amount of Oil Used When Adding 1 Gram of 99%+ Pure CBD Isolate. CBD Topical concentration measured in milligrams per teaspoon when using this much oil: 2 cups: 2 cups x 8 oz x 2 tbsp x 3 tsp = 96 teaspoons = 990 mg/ 96 tsp = 10.31 mg per tsp 1 cup: 1 x 8 x 2 x 3 = 48…