A “2% brine” can mean different things depending on the recipe. The most important first step is identifying which weight the percentage applies to: water, vegetables, or the combined batch.
The three salt calculation methods
1. Water-weight brine
Multiply only the water weight by the salt percentage. Since one milliliter of water weighs approximately one gram for normal kitchen calculations, one liter of water is treated as roughly 1,000 grams.
1,000 g water × 2.5% = 25 g salt
2. Total-weight brine
Add the water and vegetable weights, then multiply the combined weight by the selected percentage. The salt itself is not included in the starting weight.
(1,000 g water + 500 g vegetables) × 2.5% = 37.5 g salt
3. Dry salting
Used for finely shredded produce such as sauerkraut. Multiply the prepared vegetable weight by the salt percentage. The salt draws liquid from the vegetables to create the brine.
1,000 g cabbage × 2% = 20 g salt
Salt ratio reference chart
| Calculation weight | 2% salt | 2.5% salt | 3% salt |
|---|---|---|---|
| 250 g | 5 g | 6.25 g | 7.5 g |
| 500 g | 10 g | 12.5 g | 15 g |
| 1,000 g | 20 g | 25 g | 30 g |
| 2,000 g | 40 g | 50 g | 60 g |
Which percentage should you choose?
There is no universal percentage for every vegetable and process. Ingredient, cut size, temperature, duration, and the tested recipe all matter. Salt is a control factor, not merely seasoning: too little can permit unwanted organisms, while too much can inhibit lactic-acid fermentation.
The University of Minnesota Extension describes dry salting and wet brining as different methods and recommends following a research-based recipe. The National Center for Home Food Preservation publishes tested sauerkraut and fermented pickle procedures with exact salt proportions.
Why weight is better than spoons
Crystal size changes how much salt fits into a spoon. Fine pickling salt, coarse kosher salt, and flaky salt can produce different weights at the same volume. A digital scale makes percentage calculations repeatable.
Research-tested recipes may intentionally specify a particular salt and a volume measurement. When following one of those recipes, use its stated salt type and proportions rather than converting it casually.
Salt and safety
- Use a research-tested recipe when preserving food.
- Do not substitute reduced-sodium salt in fermented pickle or sauerkraut recipes.
- Keep vegetables submerged beneath the brine.
- Use clean, food-safe containers and equipment.
- Discard a ferment that is moldy, slimy, or has an objectionable odor.
- Do not use these general ratios as a shelf-stable canning process.