Brine Ratio Calculator
A brine's strength is set by how much salt it carries per unit of water, by weight. This calculator works two ways: enter salt and water to read the brine percentage, or set a target percentage and water amount to find the salt you need to weigh out. It reports both the salt-to-water convention and the salt-to-total convention so you can match whichever your recipe uses. Always weigh salt rather than measuring by volume, because crystal sizes differ widely.
Brine ratio formula
brine % (salt to water) = salt / water * 100
brine % (salt to total) = salt / (salt + water) * 100
salt needed = water * target % / 100
total brine weight = salt + water
The salt-to-water convention is most common for fermentation. The salt-to-total convention is sometimes used for curing. Pick the one your recipe specifies and keep it consistent.
Worked example
- 1,000 g water with 30 g salt gives 30 / 1,000 times 100 = 3 percent (salt to water).
- By the salt-to-total convention that is 30 / 1,030 times 100 = 2.91 percent.
- For a 3 percent target with 1,000 g water, salt needed = 1,000 times 3 / 100 = 30 g.
- Total brine weight is 1,030 g.
- Weigh the salt; do not measure it by the spoon.
Brine ratio: frequently asked questions
How is brine percentage defined?
For fermentation and pickling, brine percentage is usually the weight of salt divided by the weight of water, times 100. Some recipes instead use salt divided by the total weight of salt plus water. This calculator reports both so you can match your recipe's convention.
How much salt do I need for a given brine?
For a salt-to-water brine at percent p, salt = water times p / 100. For 1,000 g of water at 3 percent you need 30 g of salt. This calculator computes the salt needed for your target percentage and water amount.
What brine strength is used for fermentation?
Lacto-fermentation of vegetables commonly uses a 2 to 5 percent salt-to-water brine, with around 3 percent being a typical all-purpose strength. Stronger brines slow fermentation and favour preservation; weaker ones ferment faster. Always follow a tested recipe for food-safety-critical ferments.
Should I weigh or measure salt by volume?
Weigh it. Salt crystals vary widely in size, so a teaspoon of fine salt weighs far more than a teaspoon of flaky salt. Brine percentages are defined by weight, so a kitchen scale gives consistent, repeatable results that volume measures cannot.
Official sources
- USDA: National Center for Home Food Preservation.
- The salt percentage is the standard ratio of salt mass to water mass, arithmetic by definition.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.