Ingredient batch cost allocation

When adding stock items to an ingredient batch, such as a yeast batch, you are able to choose between two cost allocation methods. To help you choose which is best for you, we've outlined how the calculations are made below.

Both methods begin in the same way, by calculating a base cost to allocate each time based on the total cost and the expected usage number. For example, let's say that we have bought some yeast for £1,000. We're expecting to be able to pitch and re-crop it ten times. This means that the base cost to allocate each time is £1,000 / 10 = £100.

Whilst we are simply cropping the yeast and repitching back into a single other beer batch, both methods will simply allocate £100 of the cost to each beer batch. Both methods would allocate the costs as shown below:

The difference comes when we split the cropped yeast, using a single crop amongst multiple beer batches.

With this method, Breww will treat each split (which appear as branches on the usage tree) as a single whole usage for the purposes of the Expected usage. It will therefore allocate the full £100 to each beer batch's costs, as shown below:

The split method will instead treat repitching the yeast into multiple beer batches as a single usage that is now split between multiple "branches". It will split the single usage base cost of £100 and split it proportionally between each branch.