Recipe Scaler Calculator

Scale recipe ingredients up or down for any number of servings.

By Konstantin Iakovlev · Updated September 2026 · Source: USDA

Scale Factor

2.00x

Ingredients

IngredientOriginalScaled
Flour2 cups4 cups
Sugar1 cup2 cups
Butter0.5 cup1 cup

Add Ingredient

Use the Recipe Scaler Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only. Results are estimates based on the information you provide and the assumptions described on this page.

How It Works

Resizing a recipe by hand invites slip-ups, so this tool does the arithmetic for you and adjusts every ingredient to the number of servings you actually need. Cooking a solo dinner or feeding a crowd of 15, you get measurements that hold the dish together and leave little going to waste.

Under the hood is a straightforward ratio. The tool divides the number of servings you want by the recipe's original serving count to get a scaling factor, then multiplies every original quantity by that factor. Results are shown as the nearest kitchen fraction (eighths, quarters, thirds or halves, for example 4 ⅜ cups) when one is close, and as a decimal otherwise.

Precise measuring pays off most in baking, where small errors compound. Not every ingredient scales cleanly, though: spices often want a final tweak by taste, and cooking times can stretch noticeably once quantities grow. If your recipe mixes measurement systems, convert the units (for example, grams to ounces) before you enter anything.

Example: Scaling a Chocolate Chip Cookie Recipe

  1. 1 Input: Original Recipe Servings: 12, Desired Servings: 30. Ingredient 1: Flour, Original Amount: 2.5 cups. Ingredient 2: Sugar, Original Amount: 1.75 cups. Ingredient 3: Butter, Original Amount: 1 cup.
  2. 2 Calculation: Scaling Factor = Desired Servings / Original Servings = 30 / 12 = 2.5. New Flour = 2.5 cups * 2.5 = 6.25 cups. New Sugar = 1.75 cups * 2.5 = 4.375 cups. New Butter = 1 cup * 2.5 = 2.5 cups.
  3. 3 Result: For 30 servings, you need 6.25 cups of flour, 4.375 cups of sugar, and 2.5 cups of butter, which the calculator shows as 6 ¼, 4 ⅜ and 2 ½ cups with a 2.50x scale factor.
  4. 4 Context: This allows you to easily prepare a large batch of cookies for a community bake sale, ensuring consistent quality and enough treats for everyone.

Source: USDA · Last updated: September 2026

Frequently Asked Questions

How do I scale a recipe up or down?
Divide the desired servings by the original servings to get a multiplier. Multiply each ingredient by that factor. For example, to convert a 4-serving recipe to 6 servings, multiply everything by 1.5.
Do cooking times change when scaling a recipe?
Cooking times usually do not change proportionally. Baking a larger batch in the same-size pan may need slightly more time at a slightly lower temperature. For stovetop recipes, larger volumes may need more time to heat through.
Which ingredients should I be careful about when scaling?
Baking ingredients like baking soda, baking powder, salt, and spices should be scaled more conservatively. When doubling a recipe, use only 1.5x the leavener and salt initially, then adjust to taste. Yeast may also need proportional adjustment.

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