I'm pretty sure Analyzer starts with "Anal" for a reason. I was born an analyzer, I'm anal about analyzing.
Imagine how excited I was when I finally found a calculator built by analyzers, for analyzers.
Emergency Essentials Calculator
If you have a couple hours, this food storage calculator will analyze every facet of your pantry. It will tell you how many days of storage you do have, how much protein is in your food storage, and glaring holes in your preparation. My overall impression: This food storage calculator is incredibly time consuming, and convoluted (perfect for analyzers).
Since it left me with a final impression it's designed to get you to buy more stuff from Emergency Essentials (=uber expensive), I went looking for a user-friendly food storage calculator for less analytical Survival Mamas.
This food storage calculator is the exact opposite. It's fast, simple and easy to read. Breaks items into sections, and while it also has a list at the bottom where you can go to fill in the items you're missing, this calculator seems designed to educate people on amounts needed in their food storage to survive for one year, instead of a pressing need to hock wares.
No matter which one you decide to use, it's always a good idea to track your food storage against a benchmark. Are you preparing for a year, 6 months, 3 months, 72 hours?