Fermented Hot Sauce

This calculator works out how much brine, salt, and fermentation time a batch of lacto-fermented hot sauce needs, starting from pepper weight. Brine volume is set at 55% of pepper weight — enough liquid to fully submerge the peppers in a jar without diluting the mash more than necessary, since submersion is what keeps oxygen (and mold) away from the fermenting peppers. Salt is then calculated as a percentage of that brine volume rather than of the pepper weight itself, so raising the brine-salt percentage input directly controls the salinity of the liquid the peppers actually sit in; 3–5% is the standard range because it's salty enough to suppress spoilage organisms while still letting lactobacillus bacteria — which are salt-tolerant — thrive and produce the lactic acid that preserves and flavors the sauce. Garlic adds a flat 5 grams per clove to the total mash weight.

Fermentation time follows a simple lookup by target heat level (5, 7, or 14 days) — a proxy for how much sourness and complexity you want to develop, since longer ferments deepen flavor and slightly mellow raw pepper heat rather than literally changing the peppers' heat level. Estimated yield applies an 0.85 recovery factor to the total ingredient weight, accounting for loss during straining and blending. Worth knowing: because brine is derived from pepper weight rather than being an independent input, doubling your peppers automatically doubles your brine and salt — you don't need to recalculate ratios by hand.