What Bad Pours Are Actually Costing You (And Why Nobody Tells New Staff)

Nobody sits a new starter down on day one and tells them what an extra inch of head on every pint actually costs the till by the end of the month. So they never connect the two, and you end up nagging someone weeks later about something they didn’t know was a problem in the first place. This is the maths I wish someone had shown me nineteen years ago, and it’s the conversation worth having in induction, not months into the job.

Why an over-poured pint isn’t just “a bit of head”

The industry standard, set out in BBPA guidance endorsed by Cask Marque, is that a pint served with a head must be at least 95% liquid — the other 5% can be foam, and a customer is entitled to ask for a top-up if it isn’t. That’s the benchmark. It’s not zero tolerance on head, but it is a specific, checkable number, not “use your judgement.”

Anything poured well past that isn’t a stylistic choice, it’s product going down the drip tray that should have gone in the glass. And it adds up faster than it looks like it should, because nobody’s watching a single pint — they’re watching a whole shift.

A worked example, not a scare figure

Here’s the sum, done plainly so you can redo it with your own numbers rather than take mine on faith.

Say a busy Friday and Saturday between them do around 250 cask pints. If roughly one in five of those pours run noticeably over the 95%-liquid standard — call it an extra fifth of a pint lost to excess head each time — that’s 50 affected pours across the weekend, and 50 × a fifth of a pint works out to about 10 full pints’ worth of beer that never reached a paying customer.

At the current UK average cask ale price of £4.91 a pint (The Morning Advertiser’s Beer Report 2026 reader survey, 23 July 2026), that’s roughly £49 gone in a single weekend. Run that same pattern four weekends a month and you’re looking at close to £200 a month — which, on a lot of part-time rotas, is most of one person’s monthly wage, poured away a glass at a time by people who had no idea they were doing it.

Change the assumptions to match your own pub — your footfall, your price per pint, your own honest estimate of how often it happens — and redo the sum. The method matters more than my numbers do.

This isn’t a niche problem

This isn’t me picking on one bad pourer. Trade press coverage of UK-wide wastage research put the industry-wide cost of beer wastage at around £200 million a year across UK hospitality (Drinks Business / Foodservice Footprint, March 2025), and earlier reporting specifically on pubs estimated around 40 million pints thrown away annually (The Morning Advertiser, 20 June 2019). Whatever the exact number for your pub, the pattern behind it — small, repeated over-pours nobody’s costed out loud — is a known, industry-wide drain, not a one-off.

Why telling people afterwards doesn’t work

Pulling someone aside three weeks later to say “you’re pouring too much head” lands as a telling-off, because by then it feels personal and a bit late. Telling them on day one, as a plain fact about how the business works, lands completely differently: “Pouring away a couple of inches of head on every fifth pint costs us close to £200 a month — that’s real money out of the wage pot, not a technique note.” Framed that way it’s information, not criticism, and it’s a lot easier for someone new to actually act on.

Where this fits with the rest of your stocktake

Pour discipline is one input into your overall variance figure, not the whole story — a badly calibrated cellar line will waste beer with zero human error involved, which is a completely separate problem covered in our keg and cask calibration guide. And once you’ve got a variance number in front of you, knowing what’s a normal range versus what should worry you is covered in the acceptable stocktake variance guide. If your till figures don’t match what you counted at all, that’s usually a different issue again — see stock variance and till buttons.

Common questions