What this calculator does
Recipe scaler works out rescales quantities and adjusts baking time. 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
FormulaFactor = new servings / original servings; each ingredient × factor; tin area scales with the factor
The inputs explained
| Field | What to enter |
|---|---|
| Original servings | A number. Starts at 4. |
| Servings you want | A number. Starts at 6. |
| An ingredient quantity | A number. Starts at 250. |
| Original cooking time (minutes) | A number, measured in minutes. Starts at 45. |
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 original servings
Every other input is held at the calculator’s starting values while original servings varies. Select any row to load that scenario into the calculator.
How the answer changes with original servings