A nicotine shot calculator is a tool used to determine the amount of nicotine-containing liquid (nicotine shot) that needs to be added to a nicotine-free e-liquid to achieve a desired nicotine concentration. This is commonly used by vapers who mix their own e-liquids.

To use a nicotine shot calculator, you'll need the following information:

1. Desired Nicotine Strength: The nicotine concentration you want in your final e-liquid. Common values are expressed in milligrams per milliliter (mg/mL).

2. Base E-Liquid Nicotine Strength: The nicotine concentration of the nicotine-free e-liquid you're starting with. This is typically 0 mg/mL.

3. Nicotine Shot Nicotine Strength: The concentration of nicotine in the nicotine shot you have. Common strengths are often 18 mg/mL or 20 mg/mL.

4. Volume of E-Liquid to Be Mixed: The total volume of e-liquid you want to end up with, usually measured in milliliters (mL).

With this information, you can calculate how much nicotine shot to add using the following formula:

Amount of Nicotine Shot (mL) = (Desired Nicotine Strength * Volume of E-Liquid) / Nicotine Shot Nicotine Strength

Here's how to use the formula with an example:

Let's say you have 50 mL of nicotine-free base e-liquid (0 mg/mL) and you want to create a 6 mg/mL nicotine strength e-liquid using 18 mg/mL nicotine shots.

Desired Nicotine Strength: 6 mg/mL Base E-Liquid Nicotine Strength: 0 mg/mL Nicotine Shot Nicotine Strength: 18 mg/mL Volume of E-Liquid to Be Mixed: 50 mL

Amount of Nicotine Shot (mL) = (6 * 50) / 18 Amount of Nicotine Shot (mL) ≈ 16.67 mL

In this case, you would need to add approximately 16.67 mL of 18 mg/mL nicotine shot to your 50 mL nicotine-free base e-liquid to achieve a final e-liquid with a nicotine strength of 6 mg/mL.

Remember to always handle nicotine-containing products with care and follow proper safety precautions, as nicotine can be toxic if mishandled. Also, make sure to double-check the calculations and measurements to ensure accuracy.