How Much Does Pub Shrinkage Really Cost You?

Last updated: 26 June 2026

Most pub licensees have no idea what shrinkage is actually costing them until they stop guessing and start measuring. A 1% stock loss on wet sales quietly costs a typical pub £3,000–£5,000 a year — and that’s money already accounted for in your takings. You’ve sold it. You’ve poured it. You just never got paid for half of it.

You’re not alone in feeling blind to the real number. I ran my own pub on a tangle of spreadsheets for years, still losing track of partial kegs and spirit measures, and I had no way to know whether the variance was genuine waste, measurement error, or a till system that wasn’t pulling the right data. That gap between what you think you should have and what you actually do have — that’s shrinkage. And it compounds.

In this article, I’ll show you exactly what shrinkage costs, where it comes from, and more importantly, how to catch it before it becomes your biggest silent profit leak. You’ll learn the three places shrinkage hides in any pub, why most weekly stocktakes fail, and what actually works.

The Real Annual Cost of Pub Shrinkage

A 1% stock loss on wet sales quietly costs a typical pub £3,000–£5,000 a year. That’s not theoretical. That’s money that went over your bar, into customers’ glasses, but never made it to your till or your profit sheet.

Let’s put a number on it. If your wet sales (draught beer, cask ale, spirits, wine, soft drinks) are running at £300,000–£400,000 annually — entirely normal for a tied house — then 1% shrinkage is £3,000–£4,000. Most pubs I know are running 2–3% shrinkage without even knowing it exists. That’s double or treble the cost.

Where does that money go? It’s not usually a till error or a member of staff deliberately stealing. It’s three things: over-pouring (the free-poured 25ml that lands at 32–35ml), cellar waste (temperature issues, bad line cleaning, spillage during changes), and measurement error during stocktake itself. You measure a cask at 75% full when it’s actually 70% full, the variance stacks week on week, and by the time you notice something is off, you’ve already written it off as “normal shrinkage”.

The brutal truth is this: if you’re not measuring it weekly, you’re not managing it. Monthly stocktakes are too late. By then the variance is too big, the data is stale, and you can’t isolate where the leak started.

Where Shrinkage Hides in Your Pub

The number that actually matters is wet gross profit by line, not a single headline stock figure. Spirits hide losses in over-pouring. Draught hides it in poor cellar temperature and bad line cleaning waste. And most stock “theft” is actually measurement error and forgotten wastage.

Spirits: The Over-Pouring Problem

A 25ml spirit measure is supposed to deliver 25ml. It doesn’t. In my experience, a free-poured 25ml lands at 32–35ml on average. That’s a 30% oversize on every single measure, invisible to the customer, and invisible to you unless you’re weighing open bottles every week.

Multiply that across 40 spirit measures a night, 7 nights a week, 52 weeks a year, and you’re looking at several hundred pounds of unaccounted spirit per year on a single optic. Most pubs have 8–12 optics. The number gets large very fast.

The fix is simple: weigh open bottles every Monday morning. A set of kitchen scales costs £15. If a bottle of vodka was 750ml on Friday and 620ml on Monday, you’ve got a 130ml variance across the weekend. You know exactly where to look next.

Draught: Cellar Temperature and Line Waste

Beer is temperamental. If your cellar is running at 16°C when it should be 12–14°C, the gas pressure changes, the line foams, and you’re pouring 30% of a pint down the sink before it settles. Nobody documents that waste. But it happens every shift.

Line cleaning is the other culprit. A proper line clean (acid, then water flush) uses 3–5 pints of product per line, twice a week. That’s 30–50 pints a week of “waste” that never reaches the till. If you’re not accounting for it in your stock count, it will look like shrinkage.

The answer: dip every cask and partial keg at the same time every week, usually a Monday morning, before service. Record the dip in millimetres. Compare it to last week’s dip. If the drop doesn’t match your till data for that line, you have a problem you can actually see and solve.

Measurement Error: The Silent Killer

This is the one that gets most licensees. You’re standing in a cold cellar at 6 a.m., dipping kegs by eyeball, writing numbers on a scrap of paper, and transferring them to a spreadsheet three hours later. By then you’ve forgotten which keg you dipped first, and the number you wrote down for Cask A might actually have been Cask B. Over four weeks, these small errors compound into a “shrinkage” that doesn’t actually exist — but it’s real enough on your P&L.

The solution is brutal simplicity: reconcile against till data the same day. If your till says you sold 120 pints of bitter on Monday, and your cellar count says you poured 140 pints, you have a 20-pint variance. That’s real. You can investigate it today, not next month when the memory is gone.

Why Weekly Line Checks Work

I moved to a disciplined weekly count routine in my own pub about five years ago, and the difference was immediate. I built a simple routine around a dipstick and a set of scales, and the weekly variance went from guesswork to a number I could actually trust within a fortnight.

Here’s why weekly works and monthly doesn’t:

• The data is fresh. You can spot a problem in week one, not week four, when the keg has already been replaced and the spillage forgotten.
• You can isolate the culprit. If spirits were tight last week and loose this week, you know something changed on Tuesday or Wednesday. You can ask staff about it while it’s still fresh.
• It takes 15 minutes. A full monthly stocktake is a day’s work. A weekly line check is a dipstick and a scale, done before breakfast service. Consistency is easier than heroics.
• Variance becomes visible in trend. One bad week is noise. Four bad weeks is a pattern. You can see whether shrinkage is systematic (a staff problem, a cellar problem) or random (measurement error).

Most pubs that move from a messy spreadsheet to a disciplined weekly count claw back 1–2 gross profit points within a couple of months. That’s £3,000–£5,000 of margin recovered from measurement alone, before you’ve even addressed the over-pouring or the cellar waste.

The Measurement Error Problem

Most stock “shrinkage” is actually measurement error and forgotten wastage, not genuine loss. You’re guessing at numbers, writing them down wrong, or failing to account for legitimate waste that should come out of the count.

Common measurement errors I see:

• Dipping casks at different angles on different weeks — one day you dip from the top, one day from the side, and you get a 20mm variance that looks like loss.
• Writing down spirit bottle weights when the bottle is wet or surrounded by ice, so the weight is wrong, and the “loss” is really just condensation.
• Forgetting to account for samples given to guests, or bottles used for training, or that pint of bitter you gave away when a customer’s pint was flat.
• Till data that doesn’t talk to your stocktake — your till says you sold 150 pints of Guinness, but your cellar count is built on an estimate of how many pints are in a keg when you’re not entirely sure.

The fix: standardise your measurement. Same day of the week, same time, same method. Dip casks vertically from the top bung, every time. Weigh spirit bottles on a level surface in the same location. Record till data before you count stock, not after. This eliminates most variance within three weeks.

Quick Wins to Cut Shrinkage Today

You don’t need a revolution. Three small changes will cut shrinkage by 30–50% in the next month.

1. Weigh Your Open Spirits Every Monday

Buy kitchen scales (£15). Weigh every open bottle at the same time every Monday morning. Write the date and the weight. Next Monday, compare. If vodka dropped from 650ml to 480ml, you’ve got a 170ml variance. Plot it on a simple spreadsheet. Three weeks of data will show you whether it’s consistent (a pouring problem) or random (measurement error).

2. Dip Every Cask and Partial Keg in the Same Way, Every Week

Monday morning, 6:30 a.m., before the bar opens. Same day, same time, same method. Dip vertically from the top bung. Record the millimetres. Compare to last week’s number. If the drop is 50mm and your till says you sold the equivalent of 40mm, you have a 10mm variance worth investigating. Most weeks the variance will be tiny once the method is standardised.

3. Reconcile Till Data the Same Day You Count Stock

Pull your till report for the previous day. Count your stock. Compare in real time. If the till says 120 pints sold and the cellar says 140 pints poured, the answer is somewhere in that room, in that day, while staff memory is fresh. Next month, that variance will be invisible.

What to Track and How Often

You don’t need to track everything. You need to track what costs you money. That means wet stock (draught, spirits, wine) every week, and a full physical count every quarter.

Weekly (Monday Morning)

• Weigh every open spirit bottle
• Dip every cask and partial keg
• Note any spillage, waste, or giveaways from the previous week
• Pull your till report for the previous day
• Compare and record the variance

Monthly

• Review the four weeks of weekly variance. Is there a trend? Is one member of staff’s weeks consistently loose? Is one spirit always over-pouring?
• Full count of all sealed spirits and wine

Quarterly

• Full physical count: every cask, every bottle, every till drawer, every stock line. Close the pub for two hours and do it properly.
• Reconcile against EPOS and supplier invoices
• Calculate actual gross profit by line

This is where SmartPubTools makes a difference. Most pubs are drowning in spreadsheets, data is scattered across three systems (supplier invoices, EPOS, handwritten notes), and nobody can see the actual wet gross profit by line. StockTap pub stock app pulls your weekly dips, your spirit weights, and your till data into one place, and shows you the variance in real time. You’re not guessing at numbers. You’re looking at data.

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