The Real Cost of a Cask Range Wider Than Your Sales
Updated: Sep 4
This is Part One of a three-part series on where draught beer wastage actually comes from, starting here with range sizing, because it's usually the first place a cask goes wrong, before a single pint's even poured badly. Read Part Two: The Drip Tray Is Quietly Costing You £20k a Year
Read Part Three: Looking After Cask Beer: Setup, Conditioning and the Quality Spiral
Cask ale is a living product. Once it’s tapped and vented, it’s exposed to air, and from that point it’s on a countdown. For the session-strength beers that make up the vast majority of cask lines, that countdown is measured in days, not weeks.
Cask Marque, the industry’s independent quality accreditation body, puts real numbers behind why this matters. Their research found 97% of drinkers were satisfied with cask served at the industry-standard 11-13°C cellar temperature. Once it crept past 14°C, satisfaction collapsed to 52%. Temperature control alone can nearly halve how a pint is received. Time does the same thing to a cask that’s sitting half-empty past its best.
Why the window exists.
A cask isn’t a sealed, stable product like a keg. It undergoes secondary fermentation in the cellar, carbon dioxide is carefully managed by venting through soft and hard pegs, and once it’s tapped, oxygen starts getting in every time it’s drawn. That’s what eventually turns a cask flat, vinegary, or lifeless. It’s also why Cask Marque treats beer as a food product for accreditation purposes, unannounced twice-yearly audits, scored on temperature, appearance, aroma and taste. The standard exists because the risk of decline is real, not theoretical.
Where the maths comes in.
A standard 9-gallon cask holds 72 pints.
Sell it at a healthy 24 pints a day and it’s gone inside 3 days, at its best the whole time.
Now put three casks on instead of one. That’s 27 gallons on the bar at once. If your actual demand for cask ale hasn’t changed, still around 24 pints a day, that demand doesn’t triple because you’ve added taps. It splits three ways. Each cask now sells roughly 8 pints a day instead of 24.
At that rate, a cask that should clear in 3 days takes 9. Even allowing a bit of grace, say 5 days in: each cask has sold 5 gallons (40 pints), leaving 4 gallons, 32 pints, sitting past its peak.
32 pints at a conservative £5 a pint is £160 gone. Per cask. Across three casks, that’s £480, not from anything breaking or anyone stealing, just from a range built wider than the sales support it.
The fix.
Work out your actual average daily cask sales over a few weeks, not what looks good behind the bar. Divide that into 72 pints. If the answer is close to 3 days, your range is sized correctly. If it’s 6, 9, 12 days, you’ve got more casks on than your customers can drink through at their best.
Fewer casks, sold fresh, beats more casks, sold stale, every time. Cask Marque built an entire accreditation system around getting this right. It’s worth building your ordering around it too.
Use my Free Cask Range Calculator by clicking the link below
Enter the detail and it will tell you how many casks your sales will support
Two ways to extend what you’ve got.
If a line’s slower but you still want it on, there are two legitimate ways to buy back some of that window without cutting the beer.
Order smaller.
A firkin is 9 gallons, 72 pints. A pin is half that, 4.5 gallons, 36 pints. Putting a slower guest ale on in pins instead of firkins halves the exposure without dropping it from the range.
Cask breathers.
A demand valve replaces drawn-off beer with a small amount of low-pressure CO2, keeping oxygen out of the headspace as the level drops. It buys an extra day or two, not indefinite life, but it’s no longer the compromise it once was. CAMRA fought this for years over authenticity concerns, then reversed course in 2018 after repeated blind tastings found no detectable difference, and cask-breather pubs are now listed in the Good Beer Guide.
Neither replaces stocking to your actual demand. But combined with it, they’re the difference between “we can’t run a guest ale” and “we can, just smaller, or with a breather on it."
Related reading:
Draught Beer FAQ's · Draught Beer: Your Most Expensive Waste Stream · Nine Draught System Problems That Are Costing You Money
I'm David Holden, with 30 years of experience across stock control, financial management, and internal audit, I help hospitality operators find exactly where profit is being made and lost.
A cask range sized wider than your sales support, casks sitting past their best before they're even halfway through. If your numbers don't add up, or you're not sure whether they do, let's find it.
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