E-Liquid Calculator & Mixing Ratio Guide: 50/50 vs. 70/30, Nic Salts vs. Freebase & Steeping Times
The definitive reference article for anyone mixing e-liquids themselves: exact formulas, PG/VG matrix, nicotine chemistry, and steeping protocols — verified and curated by the Smokepope editorial team.
⚡ Quick Reference & Executive Summary
- ✔Shot Formula: (Target Volume × Target Strength) ÷ 20 mg = ml of Nicotine Shot.
- ✔50/50 for MTL/Pods (easy wicking), 70/30 VG for Sub-Ohm/DL (more vapor).
- ✔Nic Salt stays smooth at 10–20 mg/ml; Freebase above 6 mg+ hits harshly.
- ✔Steeping Time: Fruit 0–2 days, Dessert 7–14 days, Tobacco 14–21 days.
- ✔Storage: cool, dark, childproof, never in sunlight.
4 Instant Mixing Formulas
60 ml Longfill → 3 mg: 2 × 10 ml Shots (20 mg) + 40 ml Base top-up.
60 ml Longfill → 6 mg: 4 × 10 ml Shots (80 ml displaced? No: 3 ml Shots + 50 ml Base).
120 ml Shortfill → 3 mg: 6 × 10 ml Shots into 120 ml Flavor Headroom.
MTL vs. DL: 50/50 Freebase 6 mg for Pods / 70/30 Freebase 3 mg for DL.
§1.Mathematical Foundations & Density Formulas
Anyone mixing Longfill- or Shortfill-based e-liquids themselves must master two things: volume addition and nicotine dilution. Volumes are additive — 10 ml flavor plus 10 ml nicotine shot plus 40 ml base yields exactly 60 ml. Density only comes into play when working by weight instead of volume: Vegetable Glycerin (VG) has a density of approx. 1.26 g/ml, Propylene Glycol (PG) approx. 1.04 g/ml. That means: 50 ml of VG weighs around 63 g, while 50 ml of PG only weighs 52 g. For all standard mixing processes using syringes and dropper bottles, volume remains the practical unit; density figures only become relevant once you have a precision scale on hand and want weight-based mixing more accurate than 0.1 ml.
The most important formula for all mixing operations is: ml Shot = (Bottle Size × Target Nicotine Strength) ÷ Nicotine Strength of the Shot. Typically, you work with 20 mg/ml shots — that is 200 mg of nicotine in 10 ml. Example: 60 ml of liquid at 3 mg/ml → (60 × 3) ÷ 20 = 9.0 ml shot. For 6 mg/ml in 60 ml: (60 × 6) ÷ 20 = 18.0 ml — nearly two full 10-ml shots. This simple rule of three forms the foundation of every liquid calculator and every mixing chart.
§2.Decoding the PG/VG Ratio
Propylene Glycol and Vegetable Glycerin determine consistency, vapor volume, and flavor carriage. 50/50 is the classic MTL ratio: the lower viscosity ensures reliable wicking in pod systems and salt-nicotine burners with resistances from about 0.8 Ω. PG serves as an excellent flavor carrier, transports aromas more precisely, but also delivers a noticeable throat hit — ideal for freebase nicotine in sub-ohm devices. 70/30 (VG-dominated) is the standard ratio for DL vaping and sub-ohm atomizers from 0.4 Ω: the high VG content produces dense, cloudy vapor plumes, but requires powerful Kanthal wires and sufficient juice ports. If VG exceeds 80%, excessive viscosity blocks classic MTL heads and leads to dry, burnt coils.
Quick reality check before buying: Pod system < 15 W → 50/50. Sub-ohm 40–100 W → 70/30. Mega RBA cartridges → 80/20. For nic salt-based longfills, we consistently recommend 50/50, since salts are smooth anyway and PG promotes flavor development. For pure aroma longfills like the Vampire Vape Heisenberg Longfill, we follow the manufacturer's recommendation: 70/30 for maximum vapor density, 50/50 for MTL users. Important: always work with a neutral base in the matching ratio, so that your target ratio only shifts minimally due to shot displacement (a 10 ml shot typically contains PG or salt-nicotine base).
§3.Nic Salts vs. Freebase for Self-Mixing
Chemically, the two nicotine forms differ in pH: freebase nicotine is alkaline (pH ~8.0–9.0), reacts irritantly on mucous membranes, and produces the typical harsh throat hit. Above 6 mg/ml, this irritation becomes unbearable for many users. Nic salts bind nicotine to organic acids (e.g., benzoic acid, salicylic acid, lactic acid), dropping the pH to 5.0–6.0 — the result: an enormously smooth throat hit even at high doses. The nicotine shot itself remains at 20 mg/ml salt, and absorption through the oral mucosa occurs pharmacologically faster (similar to a cigarette draw), yet according to current studies delivers a lower addiction potential.
When mixing, the rule of thumb is: up to 6 mg/ml → Freebase. From 10 mg/ml → Salt. In the 3–6 mg range for MTL aroma blends, many opt for hybrids (a blend of salt shots and freebase nicotine strengths) — this optimizes vapor pressure and lung feel. In practice, they offer all the advantages: moderate throat hit, even absorption, and high nicotine strength without bitterness. Important when mixing: never mix salt shots when the longfill already contains freebase — this alters the electrolyte balance and can create unnecessary bitter flavor. Either use pure Vampire Vape Heisenberg 30 ml Aromas (nicotine-free), or optionally 20 mg salt shots.
§4.Large Interactive DIY Mixing Table 2026
For those who want precision: this table lists the most common mixing formulas, including the required 20 mg/ml shots, base top-up amount, and recommended PG/VG ratio. All values are normalized to commercially available Chubby Gorilla bottles.
| Bottle Size | Target Nicotine | Flavor Portion | Shots Required | Base Top-Up | PG/VG |
|---|---|---|---|---|---|
| 60 ml Longfill | 3 mg (Freebase) | 12 ml (Vampire Vape) | 9 ml = 1 × 10 ml | 39 ml | 70/30 |
| 60 ml Longfill | 6 mg (Freebase) | 12 ml | 18 ml = 2 × 10 ml | 30 ml | 70/30 |
| 60 ml Longfill | 10 mg (Salt) | 12 ml | 30 ml = 3 × 10 ml | 18 ml | 50/50 |
| 120 ml Longfill | 3 mg (Freebase) | 20 ml | 18 ml = 2 × 10 ml | 82 ml | 70/30 |
| 120 ml Longfill | 6 mg (Freebase) | 20 ml | 36 ml = 4 × 10 ml | 64 ml | 70/30 |
| 100 ml Shortfill | 3 mg (Freebase) | Flavor pre-included | 15 ml | No Base Required | 70/30 |
Tip: For all further calculations, use our Bases & Nicotine Shots Shop with matching calculator modules.
§5.Longfill vs. Shortfill vs. Classic Aroma & Steeping Times
Shortfills are pre-mixed, nicotine-free liquids with flavor that only need to be topped up to the desired nicotine strength. Longfills contain a highly concentrated flavor amount (e.g., 12–20 ml in 60 ml bottles) that is supplemented with shots and base. Classic aromas (1–2% dosage) require their own bases, VG, PG, and calculation work — they offer maximum control but take more time. Practical filling of a Chubby Gorilla bottle: first carefully dose the 10 ml shots with a disposable syringe, then pour in the base, close the lid, shake vigorously for 30 seconds, and let rest for at least 12–24 hours. Never work beyond the fill line.
Steeping times are crucial for flavor development. Fruit blends are often ready to vape after 0–2 days. Dessert and bakery blends benefit greatly from 7–14 days in a dark, cool cupboard — milk, vanilla, and sugar syrup need time to meld. Tobacco aromas reveal their complex notes no earlier than 14–21 days. During the steeping process, aroma molecules migrate through the base matrix, oxidation softens harsh PG notes, and the overall profile rounds out. Stronger VG-heavy blends take longer, as high viscosity slows diffusion. Practical tip: give it one brief shake per day and keep at room temperature.
§6.Common Mixing Errors & Safety Rules
The most frequent DIY liquid error: ratio panic symptoms. If menthol or cooling additives have been overdosed, they can cause extreme sensations in the lungs and nausea. Immediate action: stop vaping, drink a sugar-free beverage, and take a 30-minute break. Clean the atomizer thoroughly with warm water. In severe cases, dilute the liquid with neutral base. The second classic: too much VG in MTL pods. The high viscosity prevents the coil from wicking, the cotton dries out and burns — the result is a dry hit with sometimes toxic combustion byproducts. For all devices under 20 W, therefore, consistently use 50/50.
When it comes to safety: nicotine shots are highly concentrated and potentially toxic on skin contact. Always wear disposable gloves and work in well-ventilated rooms. Immediately clean contaminated surfaces with soap and water; never rub into eyes. Store all bases, shots, and finished liquids in a cool, dark, childproof environment at 15–20 °C. Light and heat oxidize VG and aromas, turning the liquid dark and bitter. Use only food-grade containers and avoid metal contamination. Never dilute nicotine shot with alcohol.
§7.Hardware & Product Recommendations
Bases & Nicotine Shots
Our complete range of PG and VG bases plus 20 mg/ml nicotine shots — the foundation for every DIY mix.
✅ Advantages: Food-grade quality, precision dropper bottles, German warehouse stock, neutral bases for maximum flavor freedom.
❌ Disadvantages: 20 mg shots are limited in the EU due to regulation; European shipping restrictions depending on country.
Vampire Vape Heisenberg Longfill
The legendary Heisenberg flavor — an iconic sweet-and-cool blend of fruit, eucalyptus, and chill — now as a 60 ml longfill with 12 ml concentrate.
✅ Advantages: Unique flavor, perfect mixability, compatible with all shots, excellent DL vapor at 70/30.
❌ Disadvantages: The cooling effect is intense — for sensitive users, try 50/50 for a smoother experience.
§8.Frequently Asked Questions (FAQ)
How do I calculate nicotine strength when mixing myself?
Use the basic formula: ml Shot = (Bottle Size × Target Strength) ÷ 20 mg/ml. For 60 ml and 3 mg/ml, that is 9 ml of shot — just under one full 10-ml shot. Then top up the remainder with neutral base.
When should I choose 50/50 and when 70/30?
50/50 suits MTL and pod systems under 15 W — it flows easily and transmits flavor precisely. 70/30 with a high VG content is intended for sub-ohm devices from 0.4 Ω and delivers maximum vapor density.
Is nicotine salt more dangerous than freebase when mixing?
No — the toxic dose remains the same, and toxicity during the mixing process is identical. Nic salts are only significantly smoother in the throat hit thanks to their lower pH and allow higher strengths without burning.
How long should a longfill steep?
Fruit longfills are often ready to vape after 0–2 days. Dessert and bakery blends benefit from 7–14 days of steeping, tobacco aromas from 14–21 days. Shake regularly and store cool and dark.
What should I do if the menthol or cooling effect is too strong?
Stop vaping immediately, drink plenty of cold beverages, and wait 30 minutes. Clean the atomizer thoroughly. As prevention, dilute the liquid with neutral base or switch to a 50/50 base.