Fermented Hot Sauce Calculator
Calculate salt weight, mash breakdown, ferment time and bottle yield for lacto-fermented hot sauce, plus a Scoville estimate for the finished sauce.
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:
| Brine % | Flavor Profile | Fermentation Speed |
|---|---|---|
| 2% | Mild, fast ferment | 5–7 days |
| 3% | Balanced (most common) | 7–14 days |
| 3.5% | Slightly salty, slower | 14–21 days |
| 5% | Very salty, very slow | 21–30+ days |
The ideal range for hot sauce is 3–3.5% salt by weight.
Pepper Heat Reference (Scoville Heat Units)
| Pepper | SHU Range | Heat Level |
|---|---|---|
| Bell Pepper | 0 | None |
| Poblano | 1,000–2,000 | Mild |
| Jalapeño | 2,500–8,000 | Medium |
| Serrano | 10,000–25,000 | Hot |
| Cayenne | 30,000–50,000 | Very Hot |
| Habanero | 100,000–350,000 | Extremely Hot |
| Ghost Pepper | 855,000–1,041,000 | Super Hot |
| Carolina Reaper | 1,400,000–2,200,000 | Ultra Hot |
Standard Recipe Ratios
A typical fermented hot sauce uses:
- Peppers: 70–80% of total mash weight
- Garlic: 5–10%
- Onion: 5–10%
- Other aromatics: 0–5% (ginger, herbs, fruit)
- Salt: 3–3.5% of total weight
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 (75%): 375 g
- Garlic (8%): 40 g
- Onion (7%): 35 g
- Salt (3%): 500 × 0.03 = 15 g
- Other (the remainder): 35 g (e.g., 20g mango + 15g 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 75% of the mash, and once you blend in a quarter-volume of vinegar they are down to about 60% of what goes in the bottle. So a habanero mash rated 100,000–350,000 Scoville Heat Units lands nearer 60,000–210,000 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
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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