Hi Tait, Thanks for your comment. Currently, any ingredient additions added to a recipe will need a set amount entered on the recipe. However, you can always adjust this on a brew day and add more or less than the recipe calls for. This is discussed in this help guide: Using your electronic brew sheet on a brew day . It also sounds like the Recipe-level variables for Calculated Fields, e.g. allow “Add ingredient” quantity to be the result of a calculation feature request may cover some of what you need here; it would be great if you could add you vote to this. Let me know if you need anything else. Cheers!