What this calculator does
Saponification value works out determines a fat or oil’s saponification value from a KOH back-titration with HCl. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaSV = (Vblank − Vsample) × M(HCl) × 56.1 / sample weight, where 56.1 g/mol is the molar mass of KOH
The inputs explained
| Field | What to enter |
|---|---|
| Blank titration volume (mL) | A number, measured in mL. Starts at 25. |
| Sample titration volume (mL) | A number, measured in mL. Starts at 18. |
| Molarity of HCl (mol/L) | A number, measured in mol/L. Starts at 0.5. |
| Sample weight (g) | A number, measured in g. Starts at 2. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with blank titration volume
Every other input is held at the calculator’s starting values while blank titration volume varies. Select any row to load that scenario into the calculator.
How the answer changes with blank titration volume