Reverse example: 50 g salt and 1,000 g water
On a water basis, 50 ÷ 1,000 × 100 = 5%. On a solution basis, 50 ÷ 1,050 × 100 = 4.76%. These percentages describe the same batch, using different denominators.
If that recipe also includes 500 g food and defines salt relative to food plus water, 50 ÷ 1,500 × 100 = 3.33%. Enter the food only for that basis. A calculation from known ingredient masses is not a measurement of the concentration of an unknown or previously used brine.
Two percentages for the same mixture
30 g salt with 1,000 g water is 3% relative to water, because 30 ÷ 1,000 × 100 = 3. It is about 2.91% of the solution, because 30 ÷ 1,030 × 100 ≈ 2.91.
Both descriptions can refer to the same batch. Always label the denominator when sharing a result. The calculator shows both figures so you can compare them.
Reverse a salt-and-water recipe
Choose Find percentage, enter the amount of water and salt, then choose the basis your recipe uses. Change units without changing the underlying mass: 16 weight ounces and 1 pound refer to the same amount.
With 50 g salt and 1,000 g water, the water-based percentage is 5%, while the solution-based percentage is 4.76%. If food is included, select Food + water and enter its weight as well.
A calculation is not a measurement
The tool works from known ingredient amounts. It cannot determine the concentration of a used brine from its volume, taste, or appearance. Food can release liquid or absorb salt, and sugar or other ingredients can change measurement readings.
For an unknown solution, use a suitable measurement method and its temperature calibration. Do not treat an ingredient calculation as a salometer or a laboratory measurement.