I read a lot of people are using pipettes and syringes for measuring the different ingredients for their liquids. Some even count drops which can only work if all ingredients are added from the exact same type of dropper bottle. And even then the different viscosity of the liquids will give inaccurate results.
I find this very cumbersome and not accurate enough so I'm using a way easier method: a precision scale.
I keep all my ingredients (nicotine base liquid, VG, PG, distilled water, PGA and flavors) in dropper bottles. I put my empty bottle (or an erlenmeyer flask if you want to put it in a mixer for steeping) on the precision scale (resolution of 0.01 g), zero the scale and start putting in the nicotine base liquid until I reach the desired weight. I then zero the scale again (with the bottle still on it) and go to the next ingredient and so on. This is really easy and you don't waste liquid which gets left behind in your measuring tools.
To use this method you have to know the density of each of your ingredients so here's a list of them:
PG: 1.036 g/ml
VG: 1.261 g/ml
PGA: 0.789 g/ml
Vodka: 0.938 g/ml
Water: 1 g/ml
Flavor: 1 g/ml
50/50 PG/VG: 1.149 g/ml
60/40 PG/VG: 1.126 g/ml
70/30 PG/VG: 1.104 g/ml
80/20 PG/VG: 1.081 g/ml
To be precise: flavor density depends on the base of the flavor. PG based flavors are roughly 1.04 g/ml, alcohol based flavors are roughly 0.9 g/ml. But taking an average of 1 g/ml for flavors is fine since the difference is negligible and it's subjective.
Note: Some VG base liquids come pre-diluted with water (15 to 20%) to make them thinner.
This should be mentioned on the label of the bottle and it makes the density of the liquid lower than pure VG. If this is the case it's best to measure a larger amount (say 100ml) and weigh it. Divide the result by the amount of milliliters you've measured and you know its density.
Here's an example using a calculator that can do grams by member HotRod19579:
Check the green box. Once you've entered the correct densities into the calculator, the rest is all automatic. No need to convert ml to grams. This is the best calculator I've ever used. You can download it here: click
Precision scales can be bought pretty cheap. They're not calibrated lab quality of course but they're accurate enough for this purpose. This is the one I'm using: click
I've compared it to an expensive lab model and it's pretty good!!!
You can switch between imperial and metric system. Be sure to use metric (grams).
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