If you have a bottle of e-juice that doesn’t have enough nicotine for your preferences, there’s a great formula you can use to figure out how much nicotine to add.
Just to clarify, this post isn’t about adding nicotine to a zero mg e-juice. This post is to help you figure out how much nicotine to add to an e-juice that already has nicotine in it.
Reasons for Increasing Nicotine
There are lots of reasons why you might need to add nicotine to an existing bottle of already-made e-juice.
- A bottle of e-juice handed down from a friend
- Buying a lower nicotine e-juice because it’s on sale
- Buying your all-day-vape in lower nic when your normal nic level isn’t in stock
- Increasing nicotine strength for beginner-style devices
In my case, I want to increase the nicotine strength of an e-juice that I already own to use in a device that is designed for high nicotine. Most of my e-juice is 6mg nicotine, but the device I’m using is better with e-juice somewhere around 18mg.
I don’t want to make an entire bottle of e-juice 18mg, so I’m going to try adding nicotine right to the tank, which holds 1.2ml.
Ok, so let’s go over the formula.
Vd = ( Vo * ( Sf – So ) ) / ( Sd – Sf )
- Vo = Volume Original (ml)
- So = Strength Original (mg/ml)
- Vd = Volume Delta (how much base you add) (ml)
- Sd = Strength of Delta (how strong is the base you’re adding) (mg/ml)
- Sf = Strength Final (mg/ml)
Here’s what I’m working with:
- 1.2ml = size of container I’m mixing into
- 6mg = original strength of the e-juice
- 18mg = the nicotine strength I’m aiming for
- 100mg = the strength of the nicotine that I’m using
Here’s the whole formula filled in:
Vd = ( 1.2 * ( 18 – 6 ) ) / ( 100 – 18 )
- 18 – 6 = 12
- 100 – 18 = 82
- 1.2 x 12 = 14.4 / 82 = 0.175
So that means I need to add 0.175 ml or 0.175 grams of nicotine to add to 1.2ml of e-juice.
Differences Between VG-Based and PG-Based Nicotine
The conversion for milliliters to grams is generally the same number if you’re using PG-based nicotine, so in this case, I would add 0.175 grams of nicotine.
VG-based nicotine has a slightly different weight than PG.
If you’re using VG-based nicotine, use a calculator such as the one from e-liquid-recipes.com. Fill in all of your values, then adjust the target nicotine using the number from the final ML result you got out of the formula.
For example, I got 0.175 ml, which calculates out to ~0.22 grams of 100mg nicotine.
This looks confusing at first but after you run through the process it will start to make more sense.
* source of formula