Six calculations store teams do on the back of an envelope, with the reasoning attached. No signup, nothing stored, everything runs in your browser.
These are the six numbers that decide most stock decisions in a small store. None of the maths is hard, which is exactly why it tends to get done in someone's head and then argued about later.
Every calculator runs entirely in your browser. Nothing is sent anywhere, nothing is stored, and there is no email wall. You can read the page source and check that, which is a better assurance than a sentence promising it.
Each one sits beside a glossary entry that explains where the formula comes from and works through an example. The calculator gives you the number; the definition tells you whether it is the right number to be asking for.
The stock level at which ordering now still beats running out.
The buffer between a late delivery and an empty shelf.
How long what you have lasts, in days rather than units.