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Any of the calculators will do that for you
If you're just doing the recipe, not adding to a finished one.
Same amount of nicotine regardless
I understand where he's coming from, the calculators indeed don't exactly provide the feature he wants. On the calculator, you can choose how much nicotine there will be in the finished product - not how much he needs to add to an already finished product. To not calculate it by hand, I would suggest putting in the nicotine strength at 20 mg/mL PG and setting the final ratio of the liquid to be 100% PG.
You can adjust the value of "amount to make" until the end result shows you 30 mL PG to be added into the mix.
http://tjek.nu/r/8D5e
I can't save the final amount at 35.3 mL, it has to be an absolute value. But this gives OP the answer he's looking for.
100 mg/ml | 15 ml| 30 ml | 60 ml | 120 ml --------|--------------|------|-------|--------- 3 mg | 0.46 g | 0.93 g | 1.86 g | 3.72 g 6 mg | 0.93 g | 1.86 g | 3.72 g | 7.44 g 12 mg | 1.86 g | 3.72 g | 7.44 g | 14.88 g 18 mg | 2.79 g | 5.58 g | 11.16 g | 22.32 g 24 mg | 3.72 g | 7.44 g | 14.88 g | 29.76 g
50 mg/ml | 15 ml | 30 ml | 60 ml | 120 ml --------|--------------|------|-------|--------- 3 mg | 0.93 g | 1.86 g | 3.72 g | 7.44 g 6 mg | 1.86 g | 3.72 g | 7.44 g | 14.88 g 12 mg | 3.72 g | 7.44 g | 14.88 g | 29.76 g 18 mg | 5.58 g | 11.16 g | 22.32 g | 44.64 g 24 mg | 7.44 g | 14.88 g | 29.76 g | 59.52 g
Made a reference chart here: Link
Based off of this Formula: ((outMg/nicStr) * bottleSize) * 1.03333333
Also created a google doc, which is much more condensed: Link
And then theres this PDF also: PDF Reference Chart
Syringe: 4.5ml of 20mg/ml Nic.
or if you use a scale...
5.17 grams of 20mg/ml Nic
Use a calculator? Make a recipe for a 30ml mix with 20mg nic w.e ratio being 100% vg/pg or a mix of the two. Make the target mg 3mg and it will tell you how much nic to add to the 30ml mix..
If your bottle is already 30ml it might be off my 0.05mg-0.2mg but it won't be a huge difference..
I mix 100ml + batches and only add nic when I refill a 15ml which is 0.65g to get 2mg nic juice..