Here's an Excel spreadsheet calculator that I've used to save some money this past year. Thought others might be interested in using it.
The purpose of this is to calculate the cost per 1 gram of protein rather than calculation by serving because all serving sizes are different.
If you add your own line, be sure to sort A to Z by column I (Price per gram), then sort A to Z by column C (Category - type of protein powder) to get it all in the correct order.
See attached. Forum doesn't allow Excel files so you'll have to unzip the file. Enjoy