As is often the case, there are more than one way to solve a problem. He asked about a calculator so since I think the one I use can do it, why not check with the expert (IDJoel)?
FWIW - the calculator is free. Personally, I love it and have been growing into it more over time. Yes, it took a bit to get my inventory in but even with a basic set up and not using all the features it's easy to track/sort my recipes. I started using more features over time, but you don't need to at the outset. I'm now putting the storage box location the flavor in to find them faster when I go to mix (I needed that as my stock of flavors has grown), reorder alerts and more. ELR and others are good other options for the inventory and recipes. The calculator has some nice tools to play with. Even if you don't use it for inventory/recipes, the tools come in handy sometimes.
I keep it open while I read this
thread. I enter recipes into the calculator as I go along so I don't lose them and add missing flavors to my shopping list. Whatever works for you or anyone else is all good too.