Recipe Scaler

Paste a recipe and set a positive factor, or target servings ÷ original servings. Results update as you type. Changed amounts are bold and underlined; copying exports plain text. Reset reloads the example. Recipe, selections and raw inputs stay locally across tool navigation and reload.

A quantity must start its line, optionally after a -, *, • or – bullet. Integers, decimal commas/points without thousands separators, fractions (1/2, 1½, 1 1/2) and ascending ranges (1–2 tbsp) are supported. Only this leading quantity changes; unit, ingredient text and later numbers stay untouched. Familiar exact fractions are retained; other amounts use up to 12 significant digits.

Common metric and English kitchen units, German EL/TL and spelled-out measures, French cuillères and c. à c./c. à s., Spanish cucharadas/cucharaditas/tazas and explicit piece/pinch units are recognized. Eggs, onions and cloves use a small EN/DE/FR/ES word list. This is a bounded grammar, not arbitrary language understanding; adjective-led or other uncertain ingredient lines need review. No unit or density conversion.

For uncertain amounts the action is Review quantities instead of Copy recipe. Select ingredients to scale, or leave them unchecked and Confirm selection. Automatic matches can be deselected. Changing the original clears these choices. Times, temperatures, numbered steps, serving headers, multipacks such as 2 × 400 g and malformed quantities remain outside the grammar. Serving controls do not rewrite serving counts in the text; update such headers yourself.

Examples at factor 2: 1½ cup → 3 cup; 1–2 tbsp → 2–4 tbsp; 1 egg → 2 egg. 180 °C, 20 min and step 2 stay unchanged. Fractional eggs are amounts to weigh or divide, not automatically rounded whole eggs. Scaling ingredients does not calculate cooking time, pan dimensions or recipe chemistry. Maximum 50,000 characters and 500 lines; no cloud sync. Copy or save a separate document for long-term keeping.