What a par level really means

A par level is simply the number of units you want to have on hand at any given moment. The word comes from old stock-control language, but the idea is straightforward: for every drink you sell, you decide on a minimum — the point at which you reorder — and a maximum — the ceiling you never want to bust through. Everything in between is your working range.

Get it right and the cellar stops being a guessing game. You stop sending someone to the cash and carry on a Friday afternoon because you have run out of your best-selling lager, and you stop tying up thousands of pounds in kegs that sit untouched for a month. For cask ale in particular, where a tapped firkin needs drinking within about three days, a par system is less a nice-to-have and more a form of self-defence.

Work out realistic usage before you set any numbers

Pull four to six weeks of sales data and count everything in the units you actually buy in — kegs, firkins, cases of bottles, boxes of post-mix syrup. A nine-gallon firkin holds 72 pints. A standard 11-gallon keg holds 88 pints, and a 50-litre keg works out at roughly the same. Whatever your supplier delivers, use their language so the numbers on the sheet match the numbers on the dray.

• Split your counting by category: lager, cask, stout, cider, spirits, soft drinks and mixers.
• Look at weekday patterns. In many wet-led pubs, Friday and Saturday account for well over half the week's trade.
• Ignore the one freak week when a coach party turned up. Averages beat anecdotes.
• Note anything seasonal — pale ales and cider shift faster in July than in January.

If you do not have tidy sales reports, use deliveries as a proxy. If you took four kegs of the same lager every week for the last month, that is your baseline.

Set your minimum around lead time, not guesswork

Your minimum is the amount you need to keep trading until the next delivery lands, plus a sensible buffer. Suppose you sell three firkins a week and your wholesaler delivers on Tuesday and Friday. That is a lead time of two to three days, so your minimum should cover roughly half a week's worth of sales — about one and a half firkins — and then a bit more for safety.

The buffer matters because deliveries are late, vans break down and the hot weekend nobody forecasted happens anyway. A common approach is to add 25 to 50 per cent on top of the bare lead-time figure for your fastest-moving lines, and less for the slow ones.

Cask deserves special treatment. Because an opened firkin has a short life once vented, your minimum should stay deliberately low and your stock should turn quickly. A cellar rammed with untapped firkins is not a safety net; it is a write-off waiting to happen. Where cask is slow, consider ordering smaller containers rather than holding more.

Set your maximum around space, shelf life and cash

The maximum is a ceiling, not a target. It exists to stop you over-ordering when a deal looks tempting or a rep is persuasive. Build it from four things:

• Physical capacity. How many kegs genuinely fit on the stillage? Do not count the walkway, and leave room to move.
• Shelf life. Bottled beers, juices, mixers and post-mix syrups all carry dates. Stock that does not sell before its best-before is money in the bin.
• Cash flow. Every extra keg is cash sitting in a cold room instead of in the bank.
• Consumables. Gas cylinders, line cleaner and glassware sit alongside your drinks — a full CO2 cylinder matters as much as a full keg.

A workable rule of thumb: maximum = minimum + one delivery cycle's usage. If you get two deliveries a week and sell four kegs weekly, your maximum is your minimum plus two kegs. Tweak from there once you see how it runs.

Turn the numbers into a daily routine

A par level only earns its keep if someone checks it. Keep the process short enough that it survives a busy Saturday.

• Daily: a quick cellar walk. Note anything at or below minimum on a simple sheet, whiteboard or stock app.
• Before ordering: count what is actually there. Never order from memory or from last week's list.
• Weekly: compare what you sold against what you expected, and adjust the par if a line is consistently drifting.
• Handover: leave a note for the next shift so the person ordering tomorrow knows what the cellar looked like tonight.

Keep it visible. A printed sheet on the cellar door beats a spreadsheet nobody opens, and it means a new starter can pick it up in a shift. Simple beats sophisticated every time in a working cellar.

Adjust for seasons, events and the weather

Par levels are not carved in stone. Raise your maximum before a bank holiday, a local festival, a big match or the start of the beer garden season, and lift the minimum during the busy stretch so you reorder earlier rather than later. In a heatwave, expect cider and lager to move faster and cask to deteriorate quicker — smaller, more frequent orders often beat a bulging stillage.

Review the whole set of numbers once a quarter, and after any menu change, supplier switch or significant shift in trade. Twenty minutes with a spreadsheet and a cup of tea will save you far more than that in emergency wholesaler runs and poured-away ale. Once the system beds in, it becomes second nature — and your cellar, your cash flow and your Friday nights will all feel the benefit.