Choose Brix-to-acid ratio, Brix, or titratable acidity. Enter the two displayed values, using acidity as a percent, then select Calculate.

Use Brix and titratable acidity expressed as percent for the same sample. Acid is not pH. Keep the same acid-equivalent and reporting basis when comparing ratios.

Use your measured soluble-solids reading.

Enter 0.85 for 0.85%, not 0.0085. Do not enter pH or an unconverted g/L value.

Related Calculators

Brix To Acid Ratio Formula

The main formula for the Brix to acid ratio is:

Ratio = Brix / Acid

The same relationship can be rearranged to calculate any missing value:

Brix = Ratio × Acid
Acid = Brix / Ratio
  • Brix: the soluble solids reading, usually measured in degrees Brix, commonly used as an estimate of sugar content.
  • Acid: titratable acidity as a percent, not pH. Use the same reference acid and mass/volume or mass/mass reporting basis for comparisons.
  • Ratio: the brix to acid ratio, showing how many units of brix there are for each unit of acid.

If you enter brix and acid, the calculator divides brix by acid to find the ratio. If you enter acid and ratio, it multiplies them to find brix. If you enter brix and ratio, it divides brix by the ratio to find acid.

Brix to Acid Ratio Examples

The table gives arithmetic examples, not universal taste or maturity grades. Compare equivalent samples using the same acidity method; a ratio alone cannot establish quality or food safety.

Brix to Acid Ratio Example Brix (°Bx) Example titratable acidity (%)
5 10 2
15 12 0.8
30 15 0.5
50 20 0.4

Example Calculations

Example 1: Calculate the brix to acid ratio

You have a juice sample with 14.5 °Bx and 0.85% titratable acidity.

Ratio = 14.5 / 0.85 ≈ 17.0588

The brix to acid ratio is 17.0588.

Example 2: Calculate acid from brix and ratio

You have a brix of 12.8 and a target ratio of 16.

Acid = 12.8 / 16 = 0.8000

The titratable acidity is 0.8%.

FAQ

What does the brix to acid ratio tell you?

The ratio compares soluble-solids reading with titratable acidity. It can support comparisons within a product and testing method, but absolute concentrations, cultivar and other constituents also affect taste. It is not a universal quality or safety score.

What units should I use for acid?

Use the acid value in the same form used for your testing method, commonly titratable acidity as a percent. For example, if titratable acidity is 0.75%, enter 0.75, not 0.0075. The ratio depends on entering acid consistently.

Can acid be zero in this calculation?

No. Acid cannot be zero when calculating the ratio because the formula divides by acid. Division by zero is undefined. If an acid test gives a value near zero, confirm the measurement before using the ratio.