VG/PG Ratio Explained: Best E-Liquid Ratio for Your Vape

If you've ever looked at an e-liquid bottle and seen a ratio like 50/50 or 70/30 printed on the label, you've encountered the VG/PG ratio — one of the most important, and most commonly misunderstood, specifications in vaping. Getting this ratio wrong for your device is one of the most frequent reasons new vapers experience leaking pods, weak flavour, or a harsh throat hit, even when everything else about their setup is correct.

This guide explains exactly what VG and PG are, what each one actually does inside your device, how to read and choose the right ratio for your specific kit, and how to avoid the most common mistakes. Whether you're setting up a new pod kit, trying shortfills for the first time, or just curious what those two letters on the bottle mean, this covers it in full.

This is also a particularly relevant topic for anyone who switched from a disposable vape since the UK's June 2025 ban, since disposables came pre-filled with a manufacturer-chosen ratio you never had to think about. Once you're buying your own e-liquid for a pod kit or refillable device, understanding VG/PG ratio becomes one of the few genuinely technical decisions you'll need to make, and getting it right the first time avoids a lot of unnecessary trial and error.

What Are VG and PG?

VG and PG are the two base liquids that make up the vast majority of any e-liquid, before flavourings and nicotine are added.

VG: Vegetable Glycerine

Vegetable glycerine is a thick, slightly sweet, plant-derived liquid. In e-liquid, VG is primarily responsible for vapour production — the thicker the VG content, the bigger and denser the clouds a device will produce. VG also carries flavour relatively gently and contributes a smoother, softer feel to the inhale.

PG: Propylene Glycol

Propylene glycol is a thinner, less viscous liquid widely used in food, cosmetics, and medicine as well as e-liquid. In e-liquid, PG is primarily responsible for carrying flavour intensely and for delivering the throat hit — the slight catch at the back of the throat that mimics the sensation of inhaling cigarette smoke. PG produces noticeably less vapour than VG.

The Science of Wicking: Why Viscosity Matters

To really understand why VG/PG ratio causes such practical, noticeable differences, it helps to understand what's physically happening inside a coil as you vape.

How Wicking Works

Every vape coil is wrapped in or paired with a wicking material, usually cotton, that draws e-liquid from the tank or pod toward the heating element through capillary action, the same basic physical process that lets a paper towel soak up a spill. The wick needs to resaturate with fresh e-liquid between puffs faster than the coil vaporises it, or the coil starts heating a dry or under-saturated wick, producing a harsh, burnt taste known as a dry hit.

Why Thicker Liquid Wicks More Slowly

VG is significantly more viscous (thicker) than PG, meaning it naturally moves through the wicking material more slowly. In a small, low-wattage pod coil with narrow wicking channels, this slower resaturation can't keep pace with even moderate vaping, leading to dry hits and burnt flavour. In a larger, higher-wattage sub-ohm coil with wider channels and more aggressive heating, the same thick liquid wicks fine because the whole system is engineered around handling it.

Why This Explains Leaking Too

Leaking might seem like the opposite problem to dry hits, but it often stems from the same underlying mismatch. In some pod and tank designs, e-liquid that isn't being drawn into the wick efficiently enough can instead pool and find its way out through airflow vents or seams, particularly under temperature changes or when a device is carried at an angle. Using the correct viscosity for your specific device's wicking design reduces both dry-hit and leaking risk simultaneously, since both problems share a common root cause.

How VG/PG Ratio Affects Flavour Perception

Beyond vapour production and throat hit, the ratio also genuinely changes how flavour comes across, which is worth understanding if you've ever found the same flavour name tasting different between two e-liquids.

PG as a Flavour Carrier

Propylene glycol is generally considered a cleaner, more neutral carrier for flavour compounds, often producing a crisper, more immediately noticeable flavour, particularly for sharper, brighter notes like citrus or menthol.

VG as a Flavour Carrier

Vegetable glycerine tends to round out and slightly mute flavour compared to PG, while contributing its own faint natural sweetness. Many vapers find high-VG e-liquids taste slightly sweeter and softer overall, even when using an identical flavour concentrate, simply because of how VG carries and presents that flavour compared to PG.

Why This Matters When Switching Ratios

If you switch from a 50/50 nic salt to a 70/30 shortfill in the same flavour name, don't be surprised if it tastes noticeably different, sweeter, or softer than you expected. This is a genuine, expected effect of the ratio change, not a sign that the e-liquid is faulty or mislabelled.

How the Ratio Number Actually Works

The ratio on an e-liquid bottle, such as 50/50 or 70/30, tells you the proportion of VG to PG in that liquid, always in that order. A 50/50 e-liquid is half vegetable glycerine and half propylene glycol. A 70/30 e-liquid is 70% VG and 30% PG, meaning it leans more heavily toward vapour production and a smoother inhale, with less intense throat hit than a 50/50 blend.

As a general rule, the higher the VG percentage, the more vapour and the smoother the inhale, but the weaker the throat hit and the thicker the liquid (which matters for how easily it flows through your device's wicking material). The higher the PG percentage, the stronger the throat hit and flavour intensity, but the less vapour produced, and the thinner the liquid.

Why the Ratio Matters So Much for Device Choice

The single most important practical reason to understand VG/PG ratio is that different devices are physically designed around different liquid viscosities and wattages, and using the wrong ratio for your device causes real, predictable problems.

Low-Wattage Pod Kits Need Higher PG

Small pod kits, the kind most beginners and former disposable vape users rely on, use narrow wicking channels and low power output. Thick, high-VG liquid struggles to soak through these narrow channels fast enough, leading to dry hits, weak flavour, and a coil that burns out prematurely. This is why nic salt e-liquids, designed specifically for pod kits, are almost always formulated at 50/50 VG/PG, the optimal balance for these devices.

High-Wattage Sub-Ohm Devices Need Higher VG

Sub-ohm tanks and larger coils are built with wider wicking channels and significantly more power, which can comfortably vaporise thicker, high-VG liquid. Using a 50/50 or high-PG liquid in a sub-ohm device generally produces a much weaker, thinner vapour than the device is capable of, essentially wasting its potential, and can occasionally produce a harsher, less pleasant throat hit than the device was designed for.

VG/PG Ratio Guide by Device Type

What Happens If You Use the Wrong Ratio?

Too Much VG in a Low-Power Device

• Leaking, as thick liquid struggles to wick properly and can seep out through airflow vents
• Gurgling sounds as excess liquid pools rather than vaporising cleanly
• Weak, muted flavour as the coil can't vaporise the liquid fast enough
• Premature coil burnout from the wick drying out faster than thick liquid can resaturate it

Too Much PG in a High-Power Device

• Noticeably less vapour than the device is capable of producing
• A harsher, sometimes unpleasant throat hit at high wattage
• A thinner, less satisfying overall vaping experience for anyone expecting sub-ohm-style clouds
• Faster consumption of e-liquid relative to the vapour actually produced

Nic Salts, Shortfills, and Freebase: How VG/PG Fits In

Understanding how VG/PG ratio relates to the different e-liquid formats sold in the UK helps make sense of why certain products are formulated the way they are.

Nic Salt E-Liquids

Nic salts use a different, smoother form of nicotine designed for high-strength, low-wattage use, and are almost universally formulated at 50/50 VG/PG to suit the pod kits they're designed for. This is a deliberate, consistent industry standard rather than a coincidence.

Shortfill E-Liquids

Shortfills, sold in 50ml, 100ml, or 200ml bottles with headroom for an added nicotine shot, are typically formulated at higher VG ratios (70/30 or higher), since they're aimed at higher-wattage AIO and sub-ohm devices used by more experienced vapers seeking bigger vapour production.

Freebase E-Liquids

Freebase nicotine, the older, more traditional nicotine format, is available across a range of VG/PG ratios, and is generally chosen by vapers using devices outside the typical nic salt pod kit range, including some older or more specialised device types.

A Brief History of VG/PG in Vaping

Understanding where this ratio convention came from helps explain why it's such an entrenched, standard part of how e-liquid is sold today.

Early E-Liquids Favoured Higher PG

In the earliest days of vaping, when devices were generally low-powered and closely modelled on a cigarette-like draw, e-liquids tended to favour higher PG ratios, since early coil and wicking technology wasn't well suited to thicker liquid, and the priority was replicating a cigarette-like throat hit as closely as possible.

The Rise of Sub-Ohm Vaping Shifted Demand Toward VG

As sub-ohm tanks and more powerful devices became popular, particularly through the mid-2010s, demand grew for thicker, higher-VG e-liquids capable of producing the bigger clouds these devices were designed for. This drove manufacturers to develop and refine high-VG formulations specifically, eventually establishing 70/30 or higher as the standard for this device category.

Nic Salts Brought Back the Case for 50/50

When nic salt e-liquids and pod kits emerged as a major category, designed around a tight, cigarette-like draw and far lower wattages than sub-ohm devices, the industry largely settled back on 50/50 as the optimal balance for this format, which remains the standard today and is part of why disposable vapes, almost all built around a similar low-wattage pod-style draw, were also formulated at 50/50 VG/PG before the format was banned.

Finding Your Personal Sweet Spot

Beyond the technical device-matching rules, there's also a genuine personal preference element to VG/PG ratio that's worth exploring once you understand the basics.

If You Prioritise Throat Hit

If you're switching from cigarettes and throat hit is the sensation you miss most, staying toward the higher-PG end of whatever range your device supports (50/50 rather than 60/40, for example, in a device that supports both) will generally feel more familiar and satisfying.

If You Prioritise Smoothness and Vapour

If you find PG-heavy e-liquids slightly harsh or you simply prefer a softer, smoother inhale with more visible vapour, leaning toward the higher-VG end of your device's supported range, where possible, will usually suit you better.

Experimenting Safely

If your device supports a small range of ratios (many refillable pod kits and AIO devices can handle anywhere from 50/50 to 60/40 reasonably well), trying two or three options within that supported range is a reasonable, low-risk way to find your personal preference, rather than guessing based on general advice alone. Stepping outside your device's supported range, however, particularly going to high-VG liquid in a low-wattage pod kit, is where the leaking and dry-hit problems described earlier in this guide tend to start.

Does VG/PG Ratio Affect Health or Safety?

Both VG and PG are widely used in food, cosmetics, and pharmaceutical products, and are generally recognised as safe for the purposes they're used for in those industries. In e-liquid specifically, both have a long history of use without evidence of significant harm distinct from vaping's other general risk considerations, though, as with any inhaled product, neither VG nor PG is entirely risk-free, and using the correct ratio for your device is partly a safety consideration as well as a performance one, since incorrect ratios can cause excess coil wear, leaking, and potential exposure to overheated e-liquid byproducts from a struggling coil.

A small minority of users report mild PG sensitivity, experiencing a dry mouth, sore throat, or mild skin irritation specifically linked to PG exposure. If you notice these symptoms and suspect PG sensitivity, switching to a higher-VG, lower-PG e-liquid (where your device allows it) is worth trying, since this is a recognised, if uncommon, individual sensitivity rather than a sign of a more general problem with PG itself.

How to Read an E-Liquid Label for VG/PG Information

Most reputable e-liquid brands display the VG/PG ratio clearly on the bottle or in the online product listing, typically as a ratio (50/50, 70/30) or sometimes as a percentage breakdown. If a bottle doesn't list the ratio at all, this can be a sign of a less transparent or less compliant product, and checking the brand's website or contacting the retailer directly before buying is a sensible precaution.

Nic salt e-liquids sometimes omit an explicit VG/PG ratio on the label specifically because 50/50 is such a strong industry default for this category that it's treated as assumed information, though checking the product description or brand website will usually confirm this if you want certainty before buying.

Mixing and Adjusting Ratios Yourself

Some experienced vapers buy separate VG and PG bases and mix their own custom ratios, alongside flavour concentrates and nicotine shots, to create a fully personalised e-liquid. This is a more advanced practice generally suited to vapers who already understand their preferences well and want precise control, rather than something we'd recommend for beginners, since getting ratios and nicotine dosing wrong when mixing your own e-liquid carries real risks if not done carefully and accurately.

For the vast majority of UK vapers, buying pre-mixed, TPD-compliant e-liquid at an established ratio suited to your device remains the simpler, safer, and more consistent option, and is what this guide generally recommends unless you have a specific, well-informed reason to mix your own.

Common Mistakes to Avoid

1. Buying a high-VG shortfill for a small pod kit because it was on offer or recommended generally, without checking it suits your specific device's wattage and wicking design.
2. Assuming all nic salts are interchangeable with shortfills in terms of device compatibility, when they're formulated at very different VG/PG ratios for different device types.
3. Ignoring leaking or weak flavour as a “faulty pod” issue when it's actually a VG/PG mismatch that a different e-liquid would resolve immediately.
4. Switching to a much higher VG ratio than your device has ever used without expecting some adjustment period for the coil and wicking material to adapt.
5. Not checking the ratio at all when trying a new brand or flavour, assuming it will automatically match what you've used previously from a different brand.

A Troubleshooting Decision Tree for VG/PG Problems

If you're experiencing an issue you suspect might be ratio-related, this quick decision process can help you identify and resolve it.

Step 1: Identify the Symptom

Is your device leaking, producing a burnt or weak flavour, or giving you a harsher throat hit than expected? Each points toward a slightly different aspect of the ratio mismatch.

Step 2: Check Your Current Ratio Against Your Device Type

Compare the VG/PG ratio on your current e-liquid bottle against the device guide earlier in this article. If you're using anything above 60/40 in a small pod kit, or anything at or below 50/50 in a sub-ohm tank, this mismatch is the most likely explanation.

Step 3: Adjust in the Right Direction

If you're experiencing leaking or weak flavour in a low-wattage device, move toward a lower VG ratio (more PG). If you're experiencing thin, underwhelming vapour in a high-wattage device, move toward a higher VG ratio. Make one change at a time so you can clearly identify what resolved the issue.

Step 4: Rule Out Other Causes If the Problem Persists

If adjusting the ratio doesn't resolve the issue, the underlying cause may be unrelated to VG/PG at all — a worn-out coil, an overfilled pod, or a damaged seal are all common alternative explanations worth checking next.

Frequently Asked Questions

Final Thoughts

Understanding VG/PG ratio is one of the simplest, highest-impact pieces of knowledge for getting a satisfying vaping experience, regardless of which device or e-liquid category you're using. Matching the ratio to your specific device — 50/50 for most pod kits, higher VG for sub-ohm and AIO devices — resolves the vast majority of common complaints about leaking, weak flavour, or harsh throat hit, often without needing to change anything else about your setup at all.

It's a particularly useful thing to get right early if you're new to buying your own e-liquid, whether that's because you've just bought your first kit or because you switched from a disposable vape and are now choosing bottles and pods for the first time rather than relying on a pre-filled, single-format device. A few minutes spent checking your device's recommended ratio before your next purchase will save you considerably more time, and a few wasted bottles, than working it out through trial and error.

If you're ever unsure which ratio to choose, checking your specific device's recommended e-liquid type (usually listed in the product description or manual) and cross-referencing it against the guide above is the most reliable way to make sure your next bottle actually works well with the kit you already own.