Cooking Calculator

Recipe Scale Calculator

Scale an ingredient quantity up or down from a recipe’s original yield to the number of servings you need.

Scale an ingredient quantity

Original servingsDesired servingsOriginal ingredient quantityUnitcupstablespoonsteaspoonsouncesgramsmilliliterspieces

Scale recipe

Scale factor1.5x

Scaled quantity3 cups

Quantity change+1 cup

Apply the same factor to each ingredient. Cooking time, pan size, yeast, salt, thickeners, and leavening may not scale perfectly.

How to use the recipe scale calculator

Enter the recipe’s original yield, the number of servings you want, and one ingredient quantity. Choose the ingredient’s existing unit. Repeat the calculation for the other ingredients using the same serving values.

Recipe scaling formula

Scale factor = desired servings / original servings; scaled ingredient = original ingredient x scale factor

The arithmetic preserves the ingredient ratio. A factor above 1 enlarges the recipe; a factor below 1 reduces it. Units are not converted, so 2 cups remains expressed in cups after scaling.

Worked example

A recipe serves 4 and uses 2 cups of an ingredient. Scaling to 6 servings produces a factor of 6 / 4 = 1.5. The new amount is 2 x 1.5, or 3 cups.

Ingredients that may need judgment

Straight multiplication works well for many ingredients, but kitchen processes do not always scale linearly. Pan depth affects baking time, large batches can mix or heat differently, and strong ingredients such as salt, spices, yeast, gelatin, thickeners, and leavening may need recipe-specific adjustment. Food-safety temperatures should never be reduced because a batch is smaller.

Accuracy and assumptions

• Original and desired yields use the same serving definition.
• Each ingredient keeps its original unit.
• The calculator does not convert volume to weight because density varies by ingredient.
• Cooking time, temperature, and equipment capacity are not calculated.
• Results may need practical rounding for eggs, cans, packages, or other whole items.

Frequently asked questions

Can I halve a recipe?

Yes. If the original recipe serves 8 and you want 4 servings, the scale factor is 0.5. Multiply every ingredient by one-half.

Can I convert cups to grams while scaling?

Not with a universal factor. Cups measure volume and grams measure mass, so the conversion depends on the ingredient’s density and measuring method.

How should I scale one egg?

For an exact small-batch ratio, beat the egg and measure the required fraction by weight or volume. For casual cooking, practical rounding may be acceptable depending on the recipe.

Related calculators

• Cooking Calculators
• Volume Converter
• Percentage Calculator

Sources and review

The tool applies ratio scaling and deliberately avoids ingredient-density conversions. Calculator logic and examples were reviewed by the DIY Cost Tools editorial team on September 28, 2026.

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