Basically, yield is the calculation of what you expect to obtain out of a bottle/keg etc, compared with the amount sold. This is calculated as a percentage. As an example, if you have a 70cl bottle of Vodka, selling at 25ml, you would expect to achieve 28 measures out of that bottle, that is a 100% yield. If you only sell 26 measure out of a fully consumed bottle, you will achieve a 92.86% yield. When it comes to draught beer for example, if you have 88 pints in a barrel and sell all 88, that is 100% yield. However, you will inevitably waste some through spillage and line cleaning, meaning perhaps only selling 80, this is a 91% yield. But a draught beer may well have a 5% head, so a pint is actually a little under. This will then raise your 91% yield to a 96% Yield information is very important to understanding your profitability. Your stocktaker is an expert and can talk it through with you.