Salt percentage
4% salt — traditional kimchi / kvass
Strong salt presence pre-rinse; after rinse/dilution, moderate salt with full flavor. Kvass at 4% brine retains vegetable sweetness underneath saltiness.
Salt calculator
Enter your vegetable weight and a salt percentage. We return the exact salt mass in grams, plus teaspoons for each common grain.
Grain matters: one teaspoon of Diamond Crystal weighs half as much as one teaspoon of fine sea salt. Weigh in grams when you can.
All salt grains
| Grain | Grams | Teaspoons | Tablespoons |
|---|---|---|---|
| Diamond Crystal kosher | 40 g | 14.08 | 4.69 |
| Morton kosher | 40 g | 8.33 | 2.78 |
| Fine sea salt | 40 g | 7.03 | 2.34 |
| Pickling / canning | 40 g | 7.27 | 2.42 |
Safety and use at 4%
High enough for long warm-room ferments (up to 30 days at 75°F+) with safety margin. Traditional Korean kimchi recipes use 4% salt (then rinse). Russian kvass uses 3-4% brine for long slow ferments.
Technique notes
Never use 4% for final dry-salted sauerkraut — way too salty. Only for pre-ferment rinse stages or for dilute brines (kvass) where the resulting beverage is drunk diluted or cooking vinegar.
Typical ferments at 4%
- kimchi baechu traditional
- beet kvass
- sour pickle full
Frequently asked questions
How much salt is 4% for fermentation?
4% salt = 40.0g salt per 1000g vegetables. For 500g: 20.0g salt. Multiply vegetable weight by 0.04. Use non-iodised salt and weigh in grams — teaspoon equivalences vary by salt grain type.
Is 4% salt safe for fermentation?
High enough for long warm-room ferments (up to 30 days at 75°F+) with safety margin. Traditional Korean kimchi recipes use 4% salt (then rinse). Russian kvass uses 3-4% brine for long slow ferments.
What does 4% salt taste like?
Strong salt presence pre-rinse; after rinse/dilution, moderate salt with full flavor. Kvass at 4% brine retains vegetable sweetness underneath saltiness. Never use 4% for final dry-salted sauerkraut — way too salty. Only for pre-ferment rinse stages or for dilute brines (kvass) where the resulting beverage is drunk diluted or cooking vinegar.
What ferments use 4% salt?
Common ferments at 4%: kimchi baechu traditional, beet kvass, sour pickle full. Compatible vegetables: 7 types — see list above for full pairings.
Vegetables at 4%
7 vegetables are commonly fermented at 4% salt. Each page gives timing at 68 °F, pH target, and species-specific technique.
- Napa Cabbage — 5.0d at 68 °F · pH 4.00
- Kirby Cucumber — 7.0d at 68 °F · pH 3.60
- Daikon Radish — 10.0d at 68 °F · pH 3.80
- Red Beet — 10.0d at 68 °F · pH 3.80
- Green Bean — 10.0d at 68 °F · pH 3.80
- Okra — 7.0d at 68 °F · pH 3.80
- Green (Unripe) Tomato — 10.0d at 68 °F · pH 3.80
Sources
Salt percentage guidance from the National Center for Home Food Preservation (NCHFP), FDA fermented vegetable guidelines, and Sandor Katz, The Art of Fermentation (Chelsea Green, 2012). Information is provided for educational purposes. Consult your local food safety authority for commercial production. Last verified 2026-06-09.
Gear for fermenting at 4% salt
A short, honest kit for lacto-fermentation. The scale is the one that matters most — everything here is by weight.
- Digital kitchen scale (0.1 g)Salt % is by weight, not volume — a 0.1 g scale is what makes the math above accurate.View on Amazon →
- Glass fermentation weightsKeep vegetables submerged under the brine line so they ferment safely without mould.View on Amazon →
- Airlock fermentation lidsLet CO₂ escape while keeping oxygen out — wide-mouth lids that fit standard jars.View on Amazon →
- Wide-mouth mason jarsThe workhorse vessel for kraut, kimchi and brine pickles — 1 qt and ½ gal sizes.View on Amazon →
- Pickling / fine sea saltPure salt with no iodine or anti-caking agents, which can cloud brine and inhibit fermentation.View on Amazon →
- Stoneware fermentation crockFor scaling past the jar — a water-sealed crock for 5 L+ batches with built-in weights.View on Amazon →
As an Amazon Associate, Fermentcalc earns from qualifying purchases at no extra cost to you. More on how this is funded.