Pickling Salt-to-Vegetable Calculator

For lacto-fermentation (sauerkraut, kimchi, half-sour pickles), you weigh the vegetables and add salt at a target percentage of that weight. The salt creates an environment where beneficial lactic-acid bacteria thrive and harmful bacteria do not. Different fermentations target different concentrations:

• 1.5-2.0%: light, fast ferments (cabbage for short kraut, half-sour cucumbers, quick kimchi)
• 2.0-2.5%: standard sauerkraut and most vegetable ferments, the classic range
• 2.5-3.5%: longer-keeping kraut, stronger pickles
• 3.5-5%: firm, slow ferments that keep for many months
• 5-7%: heavily salted preserves intended for very long storage and later rinsing

The math is simple weight-to-weight:

salt weight = vegetable weight × (brine % / 100)

For 1000 g of cabbage at 2% salt: salt = 1000 × 0.02 = 20 g.

For ounces, the formula is the same (salt oz = veg oz × brine%/100), but in practice salt is much easier to weigh in grams because most kitchen scales display 1-gram resolution.

Why you cannot ferment by the teaspoon

Salt crystals differ enormously in how much air sits between them, so a teaspoon is not a unit of salt, it is a unit of space:

Diamond Crystal and fine pickling salt are nearly a factor of two apart. Measure the same “1 tablespoon” of each into a 1 kg batch of cabbage and one lands at 1.6% while the other lands at 0.9%, which is under the floor where a ferment is reliably safe. This is the single most common way a home ferment goes wrong, and it is why every serious fermentation book insists on a scale. The volumes below the number are a convenience, not the recipe.

Why salt matters in fermentation:

1. Pulls water out of the vegetables (osmosis), creating brine without adding any liquid.
2. Inhibits bacteria that prefer fresh-water environments, including most pathogens.
3. Slows the ferment enough to let lactic-acid bacteria dominate.

Too little salt (under 1.5%): ferment moves too fast, becomes mushy, may grow unwanted yeast. Too much salt (over 5%): the ferment stalls or never starts. You preserve the vegetable, but you do not get the tangy lactic acidity, and the result needs rinsing before it is edible. Between 3.5 and 5% is the awkward middle: it still ferments, just slowly, and the texture stays very firm.

The 2% target is the sweet spot for most home ferments. Hit it within ±0.2% and the result will be predictable.

Use kosher salt or pickling salt. Avoid table salt with iodine (slows or kills the fermentation bacteria) and avoid added anti-caking agents (can cloud the brine). The cheapest pickling salt at any grocery store works as well as expensive specialty salts.

For vegetables that need a brine added on top (cucumbers, carrots in jars), the brine is mixed separately at the same target percentage: e.g., for 2% brine, dissolve 20 g salt in 1000 g of water, then pour over the vegetables.