# How to compare vape costs the sensible way > Liquid, coils and hardware are not comparable on the shelf label. The units that make a real comparison possible, and the traps that ruin one. Anyone can read two labels side by side. Very few people **compare vape costs** in a way that survives contact with reality, because the numbers on the shelf are not measured in the same unit. A larger bottle, a multipack of coils and a device with a proprietary pod are three different things pretending to be comparable. This guide, for adult readers, fixes the units first. ## Why you cannot compare vape costs on the label The label answers a question nobody actually has. What you want to know is what a month of vaping involves, and the label describes a single transaction of arbitrary size. Two bottles of different volume, two coil packs of different count, two devices with different consumables: none of those pairs is directly comparable. The fix is to convert everything to a unit that repeats. For liquid that unit is the millilitre. For coils it is the individual coil, not the pack. For hardware it is the working life of the device, measured in months, not the moment you pay for it. Once everything is expressed per unit, most apparent bargains rearrange themselves. That reshuffling is the whole point, and it is why people who **compare vape costs** properly rarely end up buying the item that looked cheapest. ## Liquid: the millilitre is the only honest unit British rules cap nicotine containing e-liquid at 10 ml a bottle, which is exactly why the shortfill format exists. A shortfill is a larger bottle of nicotine free liquid, deliberately underfilled, topped up at home with a nicotine shot. It exists to work around a volume cap, not to be a different product. That means the two formats are never comparable as sold. A shortfill plus its shots has to be reduced to a per millilitre figure on the finished liquid, after mixing, before it can be set against a 10 ml bottle at all. The second variable is consumption, which most comparisons ignore entirely. Airflow, coil resistance and nicotine strength decide how many millilitres a day you actually get through, and the spread between a tight mouth to lung setup and an airy direct lung one is very wide indeed. Our piece on the [monthly vaping budget](/uk/monthly-vaping-budget/) covers that spread. ## Coils: per coil, and per how long it lasts Coils are sold in packs of varying size, so the pack figure tells you nothing. Reduce it to the individual coil, then take the second step almost everyone skips: divide by how long that coil actually lasts in your hands. Longevity is not a property of the coil alone. Priming it properly and letting it soak before the first draw, staying inside the stated power range, and keeping the tank topped up rather than running it dry all stretch it considerably. Heavily sweetened liquids do the opposite, gunking the surface long before the coil fails. Prefilled pod systems break this calculation entirely, and that is the point worth understanding. There is no separate coil, because it is built into the pod and discarded with it. The pod is therefore the unit, and it carries both the liquid and the wear part at once. ## Hardware: working life, not the moment of purchase A device is not a recurring line. It is a fixed outlay spread across however long it survives, so the only meaningful comparison is over that period. A reliable kit that runs for two years and a cheap one replaced twice in the same window are far closer than the labels suggest. Since 1 June 2025 every vape legally on sale in Great Britain has to be reusable, both rechargeable and refillable or repodable. That has removed disposables from the comparison completely, and pushed the market towards refillable pod kits where the hardware line genuinely does amortise. The limiting factor on almost every pod kit is the built in battery, which cannot be replaced. It sets the end of the device's working life whatever condition the rest is in, so treat charge cycles as a wearing part when you estimate how long the kit will last. Our guide to the [best value vape kit](/uk/best-value-vape-kit/) applies that test in detail. ## What the October 2026 duty changes when you compare vape costs From 1 October 2026 the UK charges a Vaping Products Duty on vaping liquid. Its design is what matters here: it is levied on volume, at a flat rate, regardless of nicotine strength, with VAT applied on top of the duty. Nicotine free liquid is included, so shortfills are covered like everything else. Because the charge attaches to volume rather than to packaging, it makes the millilitre the correct unit by law as well as by logic. Format tricks that used to muddy comparisons, bigger bottles, bundled shots, multipacks, stop changing the underlying arithmetic at all. The consequence for anyone trying to **compare vape costs** is a simplification. Volume consumed becomes the dominant variable, so anything that reduces volume for the same satisfaction carries more weight than it did before: a tighter draw, a higher resistance coil, a strength closer to the 20 mg/ml cap. ## Three traps that ruin an otherwise good comparison The first is bulk that outlives its usefulness. Buying volume only saves anything if the liquid is used before the date on the bottle, and a stash bought ahead of a price change is worth nothing if half of it is thrown away. The second is comparing two devices whose consumables are not equally available. A proprietary pod stocked by one retailer is a risk that no per unit figure captures, because the real outcome is replacing the device when supply dries up. The third is treating flavour as free. Very sweet liquids shorten coil life measurably, which means they quietly raise the coil line while you are only watching the liquid line. That is the sort of hidden trade our guide to a [cheap vape kit](/uk/cheap-vape-kit-guide/) is built around. ## Frequently asked questions ### How do I compare a shortfill with a 10 ml bottle? Work out the finished volume after the nicotine shots are added, then reduce both options to a per millilitre figure on that finished liquid. Comparing them as sold is meaningless. ### Is the biggest bottle always the better buy? Per millilitre it often is, but only if you get through it before it goes past date. Beyond that point the saving turns into waste. ### Should I compare coils by pack or individually? Individually, and then adjust for how long each one lasts with your liquid and power settings. Two coils at the same unit figure can differ enormously in service life. ### Does the duty apply to nicotine free liquid? Yes. The charge is on vaping liquid by volume regardless of nicotine content, so nicotine free shortfills are covered in exactly the same way. ### Is running costs the only thing that matters? No. Availability of the consumable and how well the device suits your draw both decide whether you keep it, and a device you abandon is the most expensive outcome of all. ## Getting to a comparison you can trust Fix the units before anything else. Liquid per millilitre on the finished mix, coils individually and adjusted for real service life, hardware across the months it will actually run. Then add the one variable that no label carries: your own consumption, which is set by draw style, coil resistance and nicotine strength far more than by where you shop. Do that and you **compare vape costs** on the only basis that predicts anything, which is what a month with the setup involves rather than what a single purchase looks like. The rest of the [trends section](/uk/category/trends/) follows the same market shifts as they land. Editorial content for adult readers only. Vaping products usually contain nicotine, a substance that causes addiction. Not for sale to under-18s in the United Kingdom. This article is not a buying recommendation.