if my nicotine is 20mg per ml, how many ml of it do i add to a 10ml container of liquid to make it 7mg per ml?
about 3.5ml.. but keep in mind that you are diluting the flavor by about 35% too
when adding nic to premade juice you need high concentration which they have made increasingly hard to obtain in my country
I'm horrible at math! Sorry for semi OT, but math literally induces panic attacks in me. It's legitimately why it took me so long to get into DIY. I was abused by my 4 year high school math teacher. She'd humiliate me n actually brought Dum Dum lollipops to give me instead of her usual Smarties candies.
That's why I cannot live without the calculators others have mentioned!!! I'm actually getting a lot better at math bc the repetition is finally starting to click the concepts in my brain. Stick with mixing & you'll probably start noticing the same as well. I seriously feel so much smarter & it's helped boost my confidence in ways I never expected. Sorry for OT rambling but I empathize with DIYers struggling w math!
Advice: just learn it for once and all. I do dilution on liquids for work (I'm a biologist) and the reality is that even if a machine can do all the calcs for you, if you don't even have a GENERAL idea of what should be the result, you may do it wrong bc you got some data wrong