Enter the original serving count your recipe is written for and the serving count you want to produce. The calculator computes a scale factor, then multiplies every ingredient amount by that factor to give you exact scaled quantities.
The Formula
Scale Factor = Desired Servings / Original Servings Scaled Amount = Original Amount x Scale Factor
Important Exceptions
Salt and spices: scale at 75-90% for 2-3x batches to avoid over-seasoning
Baking powder and baking soda: use 2x not 3x when tripling a recipe
Leavening in yeast breads: use the same amount for 1-3x batches, increase for larger
Cooking time: does not scale linearly - use internal temperature and visual cues
Pan size: scale pan volume (not dimensions) to match the new batch size
Example Calculations
Example 1: Scaling a cookie recipe from 24 to 60
Scale factor: 60 ÷ 24 = 2.5× 2 cups flour → 5 cups flour 1 cup butter → 2.5 cups butter 2 eggs → 5 eggs 1 tsp baking soda → 2.5 tsp (use 2 tsp; reduce leavening ~20%) 1 tsp salt → 2.5 tsp (use 2 tsp; reduce salt for large batches)
Example 2: Scaling a soup recipe from 6 to 2 servings
Scale factor: 2 ÷ 6 = 0.333× 3 cups broth → 1 cup broth 2 carrots → 0.67 carrots (about 2/3 of a carrot) 1 tbsp olive oil → 1 tsp olive oil 1 tsp salt → 0.33 tsp (taste before adding; start with a pinch)
Common Mistakes to Avoid
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Scaling salt, spice, and baking powder linearly for 3×+ batches: these create soapy, bitter, or over-salted results at full mathematical scale
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Using the same pan size when scaling baked goods up: doubling a cake recipe in the same pan produces a dense, undercooked center
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Ignoring cooking time: a doubled pot of soup takes significantly longer to reach a simmer; a larger roast needs more oven time
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Rounding odd fractions too aggressively: 0.67 cups is 10 tablespoons plus 2 teaspoons, not "roughly half a cup plus a little"
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Scaling yeast for bread the same way as other ingredients: yeast does not scale linearly; the same amount works for 1–3× batches
Frequently Asked Questions
Divide your desired serving count by the original serving count to get a scale factor. Then multiply every ingredient amount by that factor. For example, if the recipe serves 4 and you want to serve 10, the factor is 10/4 = 2.5. A 2-cup flour becomes 5 cups. A 0.5 teaspoon of salt becomes 1.25 teaspoons.
The Culinary Institute of America (CIA): The Professional Chef
Primary culinary school reference for recipe scaling methodology, baker's math, and the yield percentage system used by professional recipe developers.
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USDA Cooperative Extension: Home Kitchen Scaling Guide
Extension service guidance for home cooks on scaling recipes up and down, including the leavening and salt reduction exceptions noted on this page.
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Harold McGee: On Food and Cooking (Scribner, 2004)
Scientific reference for why salt, spices, and leavening agents do not scale linearly, including the chemistry behind the exceptions highlighted in the calculator notes.
HR
Hassaan Rasheed
Developer and Researcher, CalculatorFlux
Researches and verifies the formulas, methodology, and source data behind each calculator on CalculatorFlux. All tools are built and checked against the cited references before publication.
When scaling baked goods, reduce salt and spice at about 80% of the mathematical result. A recipe designed for 12 cookies that gets scaled to 60 will taste over-salted at 5x salt - use 4-4.5x instead and adjust from there.