Last updated: 26 June 2026
A free-poured 25ml spirit measure is rarely 25ml — it’s usually 32–35ml, and most bar staff have no idea they’re doing it. You see it every shift. A customer asks for a vodka and lemonade, the bartender grabs a glass and tips the bottle, and what should be a controlled single measure becomes a casual glug that costs you margin you never see disappear. The difference between free pour and measured pour isn’t just about looking professional — it’s the difference between a 2% wet loss and a 5% wet loss, which at typical pub volumes means £3,000–£5,000 a year walking out the door in overpoured glasses.
If you’re running a pub or thinking about taking one on, this distinction matters more than most operators realise. Your EPOS tells you what sold. Your bank account tells you what money came in. But the gap between those two numbers is where bad pouring practices hide, and most publicans never actually measure it. I’m going to walk you through exactly why measured pours win, how free pouring creates losses even when nothing is being stolen, and what the actual implementation looks like on a busy service.
Key Takeaways
- Free pouring a 25ml measure typically results in 32–35ml being served, costing £3,000–£5,000 yearly on wet sales alone.
- Measured pours eliminate guesswork and create a repeatable standard that every bar staff member follows consistently.
- A 1% stock loss on wet sales is often the result of measurement error and over-pouring, not actual theft.
- Switching from free pour to measured pour claws back 1–2 gross profit points within weeks once you establish the routine.
What Is Free Pouring?
Free pouring is exactly what it sounds like: the bartender holds the bottle and pours directly into a glass without using a jigger, measure, or any fixed volume control. The operator relies on counting (“one-thousand-one, one-thousand-two”) or visual judgment to estimate when they’ve poured the right amount. It’s common in busy bars and is taught in many hospitality courses as a speed technique.
Free pouring looks efficient on the surface. No time spent hunting for a jigger. No need to set measures down and pick them up. The bar staff can work faster, especially during peak service when every second counts. But that speed comes at a direct cost to your pour cost — and most operators don’t realise how much they’re bleeding until they actually measure it.
I ran free pours in my pub for the first three years. Every single bartender did it differently. One lad had a heavy hand and was consistently over. Another was tight with the measure and we’d get customer complaints. A casual Friday night temp would pour whatever felt right at the time. No consistency, no control, and no way to reconcile stock discrepancies because there was no baseline to work from.
What Is Measured Pour?
Measured pouring means every spirit shot is poured using a jigger, measure, or optic system — a fixed, defined volume every single time. In the UK, the legal measure for a spirit in a pub is 25ml or 35ml (you choose, but you must display which one you’re using). A jigger is a handheld double-sided measure (usually 25ml on one end, 35ml on the other). An optic is a wall-mounted bottle dispenser that pours a set measure automatically.
Measured pouring creates a repeatable standard that removes human variance. Every vodka shot is the same. Every gin and tonic uses the same measure. A new bar staff member on their first shift pours the same as the most senior bartender because the tool, not the person, controls the volume.
The legal requirement in the Weights and Measures (Drinks) Regulations 2011 means you must serve spirits in one of two measures: either 25ml or 35ml. You can’t serve “a glug.” What you choose to serve is your decision, but whatever you choose, you must be consistent and you must display it clearly so customers know what they’re buying.
The Real Cost of Free Pouring
Most operators assume stock loss is theft. It’s usually not. The largest source of apparent stock loss is measurement error and over-pouring, which together account for the majority of the 1–3% variance most pubs see between what their EPOS says they sold and what their physical stock actually shows.
Let me give you the maths. A typical pub does £2,000–£3,000 wet sales per week. If your pouring is loose, you’re serving 8ml–10ml more spirit per measure than your till assumes. That’s 10–15 extra measures per busy service that nobody’s paid for. Over a week, that’s 70–105 measures. Over a year, that’s 3,600–5,400 free measures. At £2–£3 net per measure, that’s £7,200–£16,200 of cost of goods sold that came out of your margin, not out of revenue.
Most of that loss never shows as “missing stock” in a stocktake. It shows as a tiny variance on your wet GP line each week — 0.3% here, 0.5% there. Added up over 52 weeks, it’s the difference between an 18% wet margin and a 16% wet margin. For a typical 200-cask-per-week pub with spirits at 35% of mix, that’s the difference between £5,200 and £4,700 net profit on spirits alone.
I didn’t believe this until I actually measured it. I weighed open spirit bottles before and after service for a week. One bartender’s 25ml measure was averaging 31ml. Another’s was 27ml — tighter, but still over. Across the team, we were giving away approximately 15–20% more spirit per measure than the till thought we were selling. When I switched to a jigger system and tracked it, the weekly variance dropped from ±£85 to ±£12 within a fortnight. That’s real money.
Why Measured Pour Wins
Consistency and control
A measured pour is the same every time, from every bartender, every day. This creates a baseline against which you can actually measure stock movement. When your EPOS says you sold 250 spirit measures and your physical inventory confirms you sold 250 measures (within a normal variance of 1–2%), you know your operation is under control. Free pouring makes that impossible because you don’t know if a “measure” is 25ml or 35ml on any given night.
Reconciliation becomes possible
To run any meaningful stock check, you need to be able to compare what you think sold (from your till) against what actually left your cellar (from your dip or weigh). With free pouring, those numbers will never match because you have no fixed standard. With measured pouring, you can use a simple formula: opened stock plus received stock minus closing stock equals stock consumed. Divide that by your known measure volume (25ml or 35ml), and you have your actual “measures sold.” Compare that to your till data the same day. Any variance larger than 2% tells you something’s wrong — and you can investigate it properly.
Customer expectation
UK customers expect a pub spirit to be 25ml or 35ml. They know what that looks like. A free-poured measure that’s visibly larger creates a brief moment of delight followed by a hidden subsidy from your margin. A measured pour delivered consistently every time builds trust and prevents the awkward conversation where a customer compares their glass to their mate’s and finds they got less.
Staff training and accountability
Measured pouring removes guesswork from training. A new barstaff member can’t get it wrong because the jigger or optic enforces the standard. There’s no learning curve on “how full is full.” This also makes it easier to spot when someone is deliberately short-pouring or over-pouring — because the variance becomes obvious instead of hidden in general sloppiness.
How to Implement Measured Pours
Choose your method
You have three options:
- Jiggers (handheld measures). Cheapest option. Around £2–£5 per jigger. You need one per bartender or station. Staff pick it up, pour, check, and serve. Requires discipline but works. This is what I use now.
- Optics (wall-mounted auto-dispensers). More expensive upfront (£15–£30 per optic bottle) but faster and more reliable. Bottle screws into the optic, pull the lever, the measure pours automatically. Zero variance. Best for high-volume bars.
- Pre-measured bottles. Less common in pubs, more used in nightclubs. Not practical for spirits sold across multiple categories.
Most pubs use jiggers. They work, they’re cheap to replace if broken, and they’re familiar to most bar staff. Optics are worth considering if you have the budget and you’re doing high spirits volume.
Select your standard measure
You must choose between 25ml and 35ml. This is a commercial decision, not a legal one — both are legal. Most pubs use 25ml because it lets you price spirits at a lower per-drink cost and move more volume. Some premium or cocktail-focused bars use 35ml to command higher prices. Decide, communicate it clearly on your till and your menu, and stick with it.
Train your team
This isn’t a complicated process. Show staff the jigger or optic. Show them what a full measure looks like. Do a service together where you check every pour. After that, it takes about three shifts for it to become automatic. Most staff initially complain it’s slower — and for 48 hours it is. By shift three, they’re as fast as they ever were with free pouring, but now they’re consistent.
Track it in your stock routine
Here’s where most pubs fail: they implement measured pours but don’t change their stocktake process to use them. If you’re still doing a weekly count the same way you did before, you won’t see the benefit. You need to dip or weigh every open bottle, calculate how many measures that represents, and compare it to your till data within 24 hours. StockTap pub stock app makes this easier because it’s built around the assumption that you’re comparing till data to physical stock in the same count session, but even a spreadsheet works if you’re disciplined about doing it weekly.
I built a simple routine: every Monday morning, I’d weigh all open spirits, note the weight on a form, divide by 0.83g per 25ml (the density of 40% ABV spirit), and compare the result to my till’s Saturday + Sunday summary. By Tuesday, I knew exactly whether we were in or out. Within a month, that routine caught two things: a bartender consistently overpour in early service (turned out he was nervous and gripping the jigger incorrectly), and a faulty beer line that was wasting 3–4 pints per service. Neither would have been visible without the weekly reconciliation.
Common Objections
Won’t it slow my bar down?
For the first 48 hours, yes. After that, no. A practised bartender with a jigger is nearly as fast as free pouring because they’ve internalised the motion. An optic is actually faster than free pouring because there’s no guessing — pull the lever, done. The slight speed reduction is worth the margin you get back.
My staff will hate it.
Some will, initially. Most won’t. The ones who resist are often the ones who’ve been over-pouring customers they like or under-pouring ones they don’t, so the control affects them personally. Be clear: it’s not a distrust measure, it’s a standard measure. Everyone uses it equally. After a week, it becomes normal.
Don’t optics waste more because of spillage and droplets?
Marginally. You might lose 0.5–1ml per measure to droplets. That’s still better than free pouring at +8–10ml per measure. If spillage is a real problem with your optic setup, the optic isn’t installed properly or the seal is worn. Replace the seal or move the optic to a better angle.
What about cocktails? Can I still free pour in a cocktail?
You can, but you shouldn’t sell it as a 25ml or 35ml measure — you should charge for it as a cocktail with multiple components. For a standard Gin and Tonic, the gin must be measured. For a Negroni or Daiquiri with three components, measure each one. It’s actually faster because you’re not guessing three volumes simultaneously.
Do I need special equipment beyond a jigger?
No. A jigger, a set of scales for weighing open bottles, and a way to track till data weekly. That’s it. You don’t need software — though if you’re doing this weekly, SmartPubTools StockTap removes the spreadsheet admin and flags anomalies automatically, which catches errors faster.
Frequently Asked Questions
What’s the legal difference between free and measured pouring in UK pubs?
There’s no legal ban on free pouring, but you must serve spirits in either 25ml or 35ml measures. With free pouring, you can’t guarantee that standard, so you’re technically in breach of the Weights and Measures Regulations unless you’re measuring. Measured pouring means you can prove you’re compliant. Free pouring leaves you exposed if a customer disputes the measure.
How much does a typical pub lose to over-pouring annually?
A 1% stock loss on wet sales — which is largely measurement error and over-pouring rather than theft — costs a typical pub £3,000–£5,000 per year in unrecovered cost of goods sold. That translates directly to lost gross profit. The loss compounds because it affects your margin line item, making your operation look less profitable than it actually is.
Can I use optics instead of jiggers for all spirits?
Yes, optics work well for high-volume spirits like vodka, gin, and rum. They’re faster and more consistent than jiggers. The main limitations are cost (£15–£30 per optic bottle) and practicality if you stock 30+ spirit lines — the wall space becomes an issue. For most pubs, a mix of optics for top-selling spirits and jiggers for slow movers is the sweet spot.
Why does my spreadsheet not catch over-pouring variance?
Because most spreadsheet stocktakes are done weekly or monthly without comparing till data at the same time. By then, you’re comparing a moving target. You don’t know if Monday’s variance was from Friday’s over-pouring or from Tuesday’s delivery error. A same-day or next-day reconciliation between physical stock and till data is what reveals the true measure of loss. A disciplined weekly count catches it; a casual monthly count masks it.
Is measured pouring worth the effort if I’m only doing one bar?
Yes, absolutely. The smaller your operation, the more important it is because you can’t absorb waste as easily. A single-bar pub doing £8,000–£12,000 wet sales per week loses more in absolute pounds from measurement error than a chain does from its corporate-wide average. You also have the advantage of being able to implement measured pouring across your entire bar within a week, whereas a multi-site operator needs to roll it out gradually.
You now know exactly where the margin losses hide. But knowing the loss is half the battle — tracking it weekly and spotting it fast is the other half.
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