How to Scale a Recipe Up or Down

To scale a recipe, divide the target servings by the original servings to get a multiplier, then multiply every ingredient by it. Here is the method, plus the baking caveats.

Updated 5 min read By CodingEagles
Free tool Recipe Scaler Halve, double or resize any recipe by servings or multiplier. Open tool

To scale a recipe, work out a single multiplier and apply it to every ingredient. Divide the servings you want by the servings the recipe makes, then multiply each amount by that number. The recipe scaler reads your ingredient list and does this for every line, rounding the results to measurable amounts.

The multiplier method

Everything flows from one number:

  1. Find the multiplier. Target servings divided by original servings. For 4 servings up to 10, that is 10 divided by 4, which is 2.5.
  2. Multiply each ingredient. A cup of flour becomes 2.5 cups, a teaspoon of salt becomes 2.5 teaspoons.
  3. Round to something measurable. 2.5 teaspoons is fine; an odd figure like 1.83 cups is not, so round to a nearby fraction.

To halve a recipe, the multiplier is 0.5. To double it, the multiplier is 2. You can also scale to a multiplier directly when you do not think in servings, such as making one and a half times a batch.

Where scaling needs care

Multiplying ingredients is straightforward. The rest of a recipe is not always linear:

  • Bake time. A bigger batch in a bigger pan does not take proportionally longer. Start checking at the original time and judge by doneness, not the clock.
  • Pan size. Double the batter and you need a pan with roughly double the floor area, or a deeper one. The baking pan converter works out the swap.
  • Salt and spices. These can scale less than linearly for very large batches. Scale them fully first, then taste and adjust.
  • Leavening. Baking soda and powder usually scale with everything else, but very large multipliers can need a small reduction.

Scale by weight for accuracy

Fractions of a cup get messy fast. Two-thirds of three-quarters of a cup is awkward to measure, and the rounding errors stack up. Converting the recipe to grams first, with the cups to grams converter, and then scaling keeps the maths clean and the results consistent. This matters most in baking, where small errors show.

Scale your recipe

Paste your ingredient list into the recipe scaler, set the servings or a multiplier, and copy the resized list. Lines with no number, like a pinch of salt, pass through unchanged.

Frequently asked questions

How do I scale a recipe to a different number of servings?
Divide the servings you want by the servings the recipe makes to get a multiplier, then multiply every ingredient amount by it. To take a 4-serving recipe to 6, the multiplier is 6 divided by 4, which is 1.5, so each quantity goes up by half. The recipe scaler does this for every line and rounds to amounts you can measure.
Does scaling work for baking?
The ingredient amounts scale, but baking has limits. Pan size, bake time and leavening do not change in a straight line, so a doubled cake will not take exactly twice as long. For big changes, weigh ingredients in grams first, check the bake early, and adjust the pan size separately.
How do I halve an egg?
Crack and beat the egg, then use half by weight or volume. A large egg is about 50 grams, or roughly 3 tablespoons beaten, so half is about 25 grams or 1.5 tablespoons. For small batches this matters; for large ones, round to whole eggs.

Ready to try it?

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Open the Recipe Scaler

Related guides

Cups to Grams for Common Baking Ingredients A cup is 125 g of flour but 200 g of sugar and 227 g of butter. Here is a full cups-to-grams table for the ingredients you bake with. Baking Pan Size Conversions Swap pans by floor area, not width. An 8-inch square is close to a 9-inch round. Here is how to convert pan sizes and adjust the recipe.