Chocolate's fat math has one famous floor: about 35% total fat, under which the melanger labors and may not flow at all. The number is not folklore — the first-bar guide names its sources: Chocolate Alchemy's melanger minimum (their check runs 35–45% cocoa fat), and Dandelion's citation of 25% as the lowest fat in Beckett's Science of Chocolate.
Nibs carry about 55% fat (the range 50–58% comes from the roasting studies); sugar and lecithin carry none; whole milk powder carries 26% — the US standard's minimum. So 700 g nibs + 300 g sugar lands at 38.5% total fat — above the floor, no warning. But 600 g nibs + 400 g sugar lands at 33.0% — under it, and the melanger labors and may not flow.
The fix is arithmetic too: the app's formulator, asked to solve for 35%, answers add 30.8 g of cocoa butter — and the cocoa content lands at 61.2%. The floor does not end the recipe; it relocates the sugar.
Run the numbers live in the calculators — each ingredient's fat share editable, every percentage named.
Label the batch. — the cellar crew
