Calculate salt brine concentration from salt and water, or the salt or water a target brine needs, with water in grams, pounds, liters, cups or gallons.
Salt Brine Formula
The default definition is salt as a percentage of total salt-and-water mass (% w/w). The alternate definition is salt mass relative to water mass. Select the intended denominator; the same numeric percentage has a different meaning in these two definitions.
- C
- Salt concentration of the brine, expressed as a percentage of the total solution.
- Ws
- Weight of the salt.
- Ww
- Weight of the water.
For the default definition, use the final combined ingredient mass. For the alternate water-relative definition, use only water mass as the denominator: percentage = salt ÷ water × 100. For example, 5 g salt per 100 g water is 5% relative to water, but approximately 4.761905% of total solution mass.
Related Equations
If you know the total solution weight, these equivalent forms are often the most useful for batching and recipe planning:
For the total-solution definition, if you know water mass and the target percentage C, use:
For the total-solution definition, if you know salt mass and want water mass, use the following equation. For the alternate water-relative percentage P, the corresponding equations are salt = water × P ÷ 100 and water = salt × 100 ÷ P:
How to Calculate Salt Brine Concentration
- Measure the weight of the salt.
- Measure the weight of the water.
- Add them together to get the total solution weight.
- Divide the salt weight by the total solution weight.
- Multiply by 100 to convert the result to a percentage.
Choose the correct unit beside each mass input. The calculator normalizes grams, kilograms, avoirdupois ounces and avoirdupois pounds before calculating, so mixed input units are supported. Changing a unit converts the current quantity; it does not merely change its label. Fluid and troy ounces are not used.
Example
If a brine contains 10 grams of salt and 90 grams of water, the concentration is:
That result means 10% of the final brine weight is salt and 90% is water.
Common Brine Strengths
| Brine Concentration | Salt | Water | Salt:Water by Weight |
|---|---|---|---|
| 1% | 1 | 99 | 1:99 |
| 3% | 3 | 97 | 3:97 |
| 5% | 5 | 95 | 1:19 |
| 10% | 10 | 90 | 1:9 |
| 20% | 20 | 80 | 1:4 |
Each row scales proportionally. For example, a 5% brine can be made as 5 g salt and 95 g water, 50 g salt and 950 g water, or 5 lb salt and 95 lb water.
What the Percentage Really Means
- 5% w/w means 5% of the combined salt-and-water mass is salt.
- 10% w/w means 10% of the combined salt-and-water mass is salt.
- Higher concentration means more salt in each unit of finished brine.
Adding 10 mass units of salt to 100 mass units of water gives 10% relative to water. The combined mass is 110 units, so its total-solution mass percentage is instead:
Practical Tips for Using the Calculator
- Weigh ingredients instead of measuring by volume whenever possible. The formula is mass-based, so scale readings are more reliable than cups or spoons.
- Select each input unit correctly. The calculator converts mixed mass units automatically and shows equivalent output masses.
- Use the target concentration carefully when scaling a batch. Small percentage changes can noticeably change the amount of salt required.
- Check whether your process uses percent by weight. This calculator is for weight-based brine concentration, not molarity, salinity in parts per thousand, or density-based readings.
When This Calculator Is Most Useful
This calculator is especially helpful when you need to:
- find the concentration of a prepared brine,
- determine how much salt to add for a target strength,
- calculate how much water is needed to dilute a known amount of salt, or
- scale a batch up or down while keeping the same salt percentage.
Both percentage definitions scale with batch mass. Zero salt with positive water gives 0%; a 100% salt endpoint has no water and is not an aqueous brine. Inverse solves reject zero targets or zero known masses when the batch is impossible or not uniquely determined. The calculation assumes only salt and water, with no mass loss, and does not establish dissolution, saturation or a safe food-preservation process.
