Shortfill e-liquids have become one of the most popular choices among adult vapers thanks to their flexibility and wide variety of flavors. They allow users to customize nicotine strength by adding nicotine shots, commonly known as nic shots, before vaping. However, calculating the right number of nicotine shots can be confusing, especially for beginners.
This guide explains how nicotine shots work, how to calculate the correct amount for your shortfill, and the factors to consider when mixing your own e-liquid.
What Is a Shortfill?
A shortfill is a nicotine-free bottle of e-liquid that is intentionally not filled to the top. The empty space is left so you can add one or more nicotine shots without needing an additional mixing bottle.
For example:
- A 60ml bottle may contain 50ml of nicotine-free e-liquid, leaving 10ml of space.
- A 120ml bottle may contain 100ml of e-liquid, leaving 20ml of space.
- A 240ml bottle may contain 200ml of e-liquid, leaving 40ml of space.
This design makes it easy to customize the nicotine strength while keeping the flavor intact.
What Is a Nicotine Shot?
A nicotine shot is a small bottle—typically 10ml—containing nicotine suspended in either a VG/PG base. In many regions, nicotine shots are commonly available in strengths such as 18mg/ml or 20mg/ml, depending on local regulations.
Nicotine shots are designed to be mixed with nicotine-free shortfills rather than vaped on their own.
Why Use Nicotine Shots?
Adding nicotine shots offers several advantages:
- Customize your preferred nicotine strength.
- Enjoy larger bottles of your favorite e-liquid.
- Choose from a wider variety of premium flavors.
- Reduce packaging waste compared to buying multiple smaller bottles.
- Easily adjust nicotine levels over time if you plan to reduce nicotine intake.
Understanding the Calculation
Calculating nicotine strength isn’t difficult once you understand the basic principle.
The formula is:
Final Nicotine Strength (mg/ml) = Total Nicotine Content ÷ Total E-liquid Volume
Where:
- Total Nicotine Content = Nicotine shot strength × Volume of nicotine shot
- Total E-liquid Volume = Shortfill volume + Added nicotine shots
Example 1: 50ml Shortfill
Suppose you have:
- 50ml nicotine-free e-liquid
- One 10ml nicotine shot at 18mg/ml
Calculation:
- Nicotine content = 18 × 10 = 180mg
- Total liquid = 60ml
Final nicotine strength:
180 ÷ 60 = 3mg/ml
This is one of the most common shortfill combinations.
Example 2: 100ml Shortfill
You have:
- 100ml shortfill
- Two 10ml nicotine shots at 18mg/ml
Calculation:
- Total nicotine = 18 × 20 = 360mg
- Total volume = 120ml
Final strength:
360 ÷ 120 = 3mg/ml
Again, the result is approximately 3mg/ml.
Example 3: 200ml Shortfill
For larger bottles:
- 200ml shortfill
- Four 10ml nicotine shots (18mg)
Calculation:
- Nicotine content = 18 × 40 = 720mg
- Total volume = 240ml
Final nicotine strength:
720 ÷ 240 = 3mg/ml
Quick Reference Table
| Shortfill Size | Nicotine Shot(s) | Final Volume | Approx. Strength* |
|---|---|---|---|
| 50ml | 1 × 10ml | 60ml | 3mg/ml |
| 100ml | 2 × 10ml | 120ml | 3mg/ml |
| 150ml | 3 × 10ml | 180ml | 3mg/ml |
| 200ml | 4 × 10ml | 240ml | 3mg/ml |
*Assumes 18mg/ml nicotine shots. If using a different strength (such as 20mg/ml where legally available), the final nicotine strength will differ.
Can You Create Higher Nicotine Strengths?
Yes, but only if there is enough space in the bottle or you transfer the e-liquid into a larger mixing bottle.
For example:
- Add extra nicotine shots.
- Use an empty mixing bottle with more capacity.
- Shake thoroughly after mixing.
Always ensure there is sufficient room to mix the e-liquid safely without spilling.
Does Adding Nicotine Affect Flavor?
Adding one nicotine shot to a standard shortfill usually has only a minor effect on flavor.
However, adding several nicotine shots may:
- Slightly dilute flavor intensity.
- Change the VG/PG ratio.
- Produce a slightly stronger throat hit.
Premium shortfills are generally formulated to maintain good flavor after the recommended number of nicotine shots has been added.
Does VG/PG Ratio Change?
Yes.
Most nicotine shots use either:
- 70VG/30PG
- 50VG/50PG
Adding them changes the final VG/PG balance slightly.
For example:
- A high-VG shortfill remains suitable for sub-ohm vaping after adding one or two high-VG nic shots.
- Adding multiple 50/50 nicotine shots will gradually increase the PG content.
If maintaining a specific VG/PG ratio is important, choose nicotine shots that match the base of your shortfill.
How to Mix Nicotine Shots
Mixing a shortfill is straightforward:
- Remove the bottle cap and nozzle.
- Pour the nicotine shot into the shortfill bottle.
- Replace the nozzle securely.
- Tighten the cap.
- Shake vigorously for at least one to two minutes.
- Let the e-liquid sit for a short period so the nicotine blends evenly before use.
Proper mixing helps ensure consistent nicotine strength and flavor throughout the bottle.
Safety Tips
When handling nicotine shots:
- Keep them away from children and pets.
- Avoid contact with skin and eyes.
- Store bottles in a cool, dry place away from direct sunlight.
- Wash your hands after handling nicotine.
- Dispose of empty bottles according to local recycling guidelines.
Frequently Asked Questions
Can I vape a nicotine shot by itself?
No. Nicotine shots are designed to be mixed with nicotine-free e-liquid. Using them on their own may provide an excessively high nicotine concentration and an unpleasant vaping experience.
How long should I shake the bottle?
A vigorous shake for one to two minutes is usually sufficient. For the best consistency, many users allow the mixture to rest briefly before vaping.
Can I add half a nicotine shot?
Yes. If you’re aiming for a lower nicotine strength than a full shot would provide, you can measure and add part of a nicotine shot using appropriate mixing tools.
Will nicotine shots reduce cloud production?
In most cases, adding the recommended amount of nicotine has only a minimal effect on vapor production. The final cloud output depends primarily on the VG/PG ratio and the vaping device being used.
Conclusion
Calculating nicotine shots for shortfills is much easier once you understand the relationship between nicotine content and total e-liquid volume. Whether you’re mixing a 50ml, 100ml, or larger shortfill, using the correct number of nicotine shots allows you to tailor your vaping experience to your preferred strength while maintaining excellent flavor.
By choosing compatible nicotine shots, mixing carefully, and following safe handling practices, adult vapers can enjoy a customized e-liquid that balances convenience, performance, and satisfaction.