Hi I've been making my own e juice for a while buying the non nicotine liquids and mixing it with my nicotine. I've got new nicotine now it is 100mg/ml. I'm just checking that my ratio is correct. If I'm making 30 ml of juice and I want it to be 18 mg nicotine strength. The calculator says it should be 5.4 ml nicotine and 24.6 ml of e juice. Is that correct? Thank you