Fermented Hot Sauce Calculator

Lacto-fermented hot sauce relies on salt to create an environment where beneficial Lactobacillus bacteria thrive while harmful bacteria are suppressed. Getting the salt ratio right is critical for both safety and flavor.

Brine Percentage Formula

Salt Weight (g) = Total Weight of Mash (g) × Brine Percentage / 100

For a mash-style ferment (peppers blended with salt), the standard range is:

The ideal range for hot sauce is 3–3.5% salt by weight.

Pepper Heat Reference (Scoville Heat Units)

Standard Recipe Ratios

A typical fermented hot sauce uses:

• Peppers: 70–80% of total mash weight
• Garlic: 5–10%
• Onion: 5–10%
• Other aromatics: 0–6% (ginger, herbs, fruit)
• Salt: 3–3.5% of total weight

The calculator holds garlic at 8% and onion at 7%, gives the salt whatever percentage you asked for, and lets the peppers take what is left after a small allowance for the other aromatics. That keeps every line inside the ranges above and, more usefully, keeps the five lines adding up to the weight you asked for. Fruit-forward sauces do run past 6% on aromatics, mango especially, and if that is what you are making, take the extra out of the pepper share rather than adding it on top.

Worked Example

Target: 500 g of pepper mash at 3% salt. Every percentage below is a share of that 500 g, salt included, so the parts add up to the target rather than overshooting it:

• Peppers (77%): 385 g
• Garlic (8%): 40 g
• Onion (7%): 35 g
• Salt (3%): 500 × 0.03 = 15 g
• Other (the remainder, 5%): 25 g (e.g., 15g mango + 10g ginger)
• Total mash: 500 g

Estimating the heat of the finished sauce

The pepper is not the sauce. In the batch above the peppers are 77% of the mash, and once you blend in a quarter-volume of vinegar they are down to about 62% of what goes in the bottle. So a habanero mash rated 100,000–350,000 Scoville Heat Units lands nearer 62,000–216,000 in the bottle. Still enough to hurt, but not the number on the pepper. The calculator does this dilution for you from the pepper you pick and the vinegar you add.

Ferment at room temperature (65–75°F / 18–24°C) for 7–14 days, burping the jar daily. Blend with vinegar (typically 1/4 to 1/3 of total volume) after fermentation for the classic hot sauce consistency.

Post-Fermentation

• Blend the mash until smooth
• Add vinegar to taste (apple cider or distilled white)
• Strain through a fine mesh for smooth sauce, or leave chunky
• Final pH should be below 3.5 for shelf stability