Recipe Scaler — Free Scale Up or Down Calculator

Use this recipe scaler to scale ingredients up or down by serving count. Enter the original ingredient amount, the recipe’s original servings, and the desired servings. The calculator shows the scaled amount, scale factor, and optional unit conversion so you can double, halve, or resize a recipe without doing the ratio math by hand.

Recipe scaling is useful for batch cooking, meal prep, catering, restaurant prep sheets, family dinners, and adapting recipes from a cookbook to the number of people you actually need to feed. If you also need to change measurement systems, use the Recipe Converter. If you are pricing a scaled restaurant batch, use the Recipe Cost Calculator.

How to Use the Recipe Scaler

The calculator works for increasing or decreasing a recipe. It can scale 4 servings to 20 servings for catering, 12 servings to 6 servings for a smaller household, or 8 servings to 1 serving for single-portion meal prep.

Recipe Scaling Formula

The basic formula is:

Scale factor = Desired servings / Original servings
Scaled ingredient = Original ingredient x Scale factor

If the original recipe serves 6 and you want 15 servings:

Scale factor = 15 / 6 = 2.5

Every ingredient starts by multiplying by 2.5. A 2-cup ingredient becomes 5 cups. A 3-teaspoon ingredient becomes 7.5 teaspoons. A 12-ounce ingredient becomes 30 ounces.

Example: Scale a Recipe from 6 to 15 Servings

The ingredient proportions stay the same because every ingredient uses the same scale factor.

Common Scale Factors

Small scale factors can create awkward measurements, especially for spices and leavening. Convert tablespoons to teaspoons or ounces to grams when the scaled number is easier to measure in a smaller unit.

Scaling Tips for Baking

Baking is less forgiving than soups, stews, and sauces. Scaling flour, sugar, liquid, yeast, baking powder, and salt changes the structure of the finished product. Use weight measurements when possible and avoid rounding aggressively.

For cakes, breads, and cookies:

• Use grams for dry ingredients when possible.
• Keep leavening precise.
• Check pan area and batter depth.
• Do not assume cook time doubles with the batch.
• Make a test batch before scaling for an event or menu launch.

Scaling Tips for Restaurants

Restaurant kitchens often scale recipes from a small test batch to prep-sheet quantities. Keep the recipe in one measurement system, document the yield, and price the scaled batch with the Recipe Cost Calculator.

If a recipe makes 12 portions and the prep list needs 48 portions, the scale factor is 4x. If one portion is 6 ounces, the new batch should produce 288 ounces of finished food before expected trim or cooking loss. That yield check is as important as the ingredient math.

Recipe Scaling Mistakes to Avoid

• Changing some ingredients but not all — start with the same factor for the whole recipe.
• Rounding salt too high — small rounding differences can make large batches too salty.
• Ignoring equipment limits — a pot, mixer, pan, or oven may not handle the scaled volume.
• Forgetting evaporation and reduction — large sauce batches may reduce differently.
• Scaling cook time directly — temperature and food depth matter more than serving count.

Use this recipe scaler for the ingredient math, then use kitchen judgment for equipment, timing, taste, and texture.