Pub GP & profit-leak calculator
Two quick sums most licensees get told by a stocktaker four times a year. Do them yourself in ten seconds. First, your real GP% on any line. Then what the gap to your target is quietly costing you a year. No jargon, no VAT confusion, built by someone who runs a wet-led pub.
Enter the price a customer pays (inc VAT) and what the product costs you (ex VAT). We strip the VAT out for you, because mixing the two is the number-one reason a GP looks wrong.
Now the one that stings. Put in your weekly wet sales and the GP you're actually running, against the GP you're aiming for. This is the money on the table, not an accusation — most of it is priced-in wastage, miskeyed till buttons and drift, not people.
Rough guide, not gospel: it assumes your current and target GP are blended across your wet sales. A weekly stocktake is what turns a guess like this into a real number you can act on.
Get the 20-line GP cheat sheet
The one-page sheet I actually use: the 20 lines worth counting first, the GP band each should hit, and the three till-button mistakes that fake a stock loss. Pop your email in and it's yours to download straight away.
Sorted. Here's your cheat sheet — pin it up in the cellar.
Download the cheat sheet (PDF)This is the bit StockTap does on its own
The calculator is the manual version. StockTap weighs your spirits to the millilitre, handles draught and the legal head on a pint properly, and hands you the GP and the variance the same night, on your phone. Founding price is £19 a month, cancel any time.
Start a free trialHow the GP sum actually works
Gross profit is the share of a sale you keep after the product cost, before your rent, staff and everything else. The only trap is VAT. The price on your till is inc VAT, but your GP has to be worked out on the ex-VAT price, or the number flatters you. So the tool takes your selling price, removes the VAT to get the net sale, subtracts the ex-VAT cost, and shows what's left as a percentage of that net sale. Do it on a £5 pint that costs you £1.50 and you're looking at roughly 64%, which is healthy for draught.
Why the gap in step two matters more than the GP itself
A single line's GP is easy. The money hides in the gap between what you think you're making across everything and what you actually bank. A few points of GP on decent wet sales is thousands a year, and most of it isn't theft — it's the pint poured with too much head counted as sold, the double vodka keyed as a single, the promotion nobody switched off. You only see it if you count, weekly, and compare. That's the whole job.