Does cooking time double when I double the recipe?

No. For baked goods in a larger pan, cooking time increases by 10 to 20 percent, not 100 percent. For stovetop soups and stews, cooking time is unchanged because the time is set by texture target, not volume. For roasted meats, cooking time scales roughly with the linear dimension (thickness) of the cut, not the volume.

What about pan size for baked goods?

Doubling a recipe usually requires a different pan. For a doubled rectangular cake, use a 9x13 pan instead of an 8x8 pan (the 9x13 has approximately twice the volume). For doubled round cakes, use two 9-inch rounds instead of two 8-inch rounds, or one 10-inch round. Filling a pan more than two-thirds of its capacity risks overflow during baking.

Can I scale a recipe by more than 4x?

For savory cooking yes, with care for seasoning at large batches (garlic and chili especially can become overpowering when scaled linearly to large batches; reduce by about 80 percent of the ratio). For baking, extreme scaling produces poor results; better to run the recipe at the original scale multiple times. For institutional or commercial baking, use commercial recipes tested at the target batch size.

Recipe Scaler Calculator (Resize Servings)

Recipe Scaler Calculator (Resize Servings, Adjust Ingredients)

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Scaled quantity

Scaling ratio

Original servings

New servings

Double the recipe

Half the recipe

0.5

Why this calculator

Recipe scaling is straightforward arithmetic but easy to get wrong in a hurry. The basic operation is to compute the scaling ratio (target servings divided by original servings) and then multiply each ingredient quantity by that ratio. The wrinkles are: some ingredients do not scale linearly (baking powder, salt in baked goods, leavening agents), cooking time changes non-linearly with batch size, and pan size matters more than ingredient quantity for many baked goods.

This calculator takes the original recipe servings, the target servings, and any one ingredient quantity. It returns the scaled ingredient quantity in the same unit, plus the scaling ratio and a few reference scalings (double the recipe, half the recipe). Run it for each ingredient in the original recipe to get the full scaled-up version.

A rough sanity check: scaling a 4-serving recipe to 8 servings doubles every ingredient. Scaling 6 servings to 2 servings multiplies each ingredient by 1/3 (about 0.33). Scaling 4 to 24 servings multiplies by 6, which is when the practical wrinkles kick in: a 6x recipe usually needs a different pan, different cooking time, and may need leavening adjustments.

For most savory cooking (soups, stews, casseroles, sauces, stir-fries), linear scaling works fine for any reasonable ratio (0.25x to 4x). For baking, linear scaling is reliable up to about 1.5x or down to about 0.75x; beyond that, leavening agents and salt may need slight adjustments (typically reduce salt and leavening proportionally less than the main scaling ratio). Cooking time scales roughly with the square root of the volume ratio for baked goods, not linearly: doubling a cake recipe does not double the cooking time, it adds maybe 10 to 20 percent.

The deep dive

How linear scaling works (and where it breaks)

The scaling ratio is target servings divided by original servings. Multiply each ingredient by this ratio to get the scaled quantity. For a 4-to-8 doubling, the ratio is 2; for a 6-to-2 reduction, the ratio is 0.33; for a 4-to-24 sextupling, the ratio is 6.

This works almost perfectly for: liquid ingredients (water, broth, milk, juice, oil), most spices in moderate ranges, vegetables and proteins, fruits and sweet additions. These scale linearly because their function is purely additive (adding more produces more) and there are no interaction effects with the cooking process at typical scaling ratios.

Linear scaling breaks down for: leavening agents (baking soda, baking powder, yeast) at extreme ratios; salt in baked goods at extreme ratios; cooking time and temperature for any recipe at extreme ratios; pan size for baked goods. The breakdown is gradual; at 1.5x and 0.75x it is barely noticeable, at 2x and 0.5x it is starting to matter, at 4x and 0.25x it usually matters.

Leavening adjustments in baking

For doubling a quick-bread or cake recipe, increase the baking powder or baking soda by about 1.8x rather than 2.0x. The reasoning: leavening agents work by gas release that fluffs the dough; in a larger volume of dough, the gas release per unit volume needs to be similar to the original, so the leavening agent scales slightly less than proportionally. For tripling, use about 2.5x leavening. For halving, use about 0.55x leavening rather than 0.5x.

Yeast in bread recipes follows a different curve. For typical home-baking quantities (1 to 6 loaves) yeast scales linearly. For very large batches (12+ loaves), yeast can scale slightly less than proportionally because of the longer rise time available.

Cooking time and pan size

A doubled cake recipe baked in a same-size pan would overflow. The right approach is to use a larger pan (or two of the original pan size). For a doubled rectangular cake, use a 9x13 pan instead of an 8x8 pan; this is roughly 2x the volume. The cooking time for the doubled cake in the larger pan is roughly 10 to 20 percent longer than the original, not 2x longer. The reason: heat penetration scales with the linear dimension of the pan, not the volume.

For soups and stews, the cooking time is determined by the texture target (how tender the meat or vegetables need to be), not by the volume. Doubling a soup recipe does not require longer simmering for the same texture. The exception is for soups that depend on reduction (concentrating the flavor by evaporation), where larger volumes take proportionally longer to reduce.

Practical tips for scaling

For doubling or tripling a savory recipe: scale ingredients linearly, use a larger pot, simmer for the same time as the original, taste and adjust seasoning at the end.

For halving a recipe: scale ingredients linearly, use a smaller pot, watch cooking time because smaller volumes heat up faster and you can overcook.

For halving a baked good: divide leavening by slightly more than 2 (use 0.55x instead of 0.5x), bake in a smaller pan or for less time than the original, check for doneness 5 to 10 minutes earlier than the original recipe specifies.

For extreme scaling (4x or more, or 0.25x or less): consider running the recipe at the original scale multiple times rather than scaling, especially for baked goods. The food quality is usually better than a heavily-scaled batch.

What this calculator does not include

Leavening adjustments for extreme scaling ratios. Cooking time and temperature adjustments. Pan size recommendations for scaled-up baked goods. Ingredient-specific scaling rules (e.g., garlic and chili peppers often scale less than linearly to avoid overpowering at large batches; salt in baked goods may scale slightly less than linearly). Unit conversions (cups to grams, tablespoons to milliliters). Yeast adjustments for very large batches. Hydration ratios in bread baking (typically scale linearly but require checking). For complex baking projects or extreme scaling ratios, follow a tested recipe at the target size rather than scaling from a smaller version.

Frequently asked questions

4 questions answered

For most savory cooking and moderate scaling (0.5x to 2x), yes. For baking and extreme scaling ratios, leavening agents and salt should scale slightly less than linearly; doubling a cake recipe typically uses about 1.8x baking powder rather than 2x. Cooking time scales much less than linearly, especially for baked goods.

Recipe Scaler: Resize Any Recipe to a New Number of Servings