Recipe Scaling Calculator

To double a recipe, multiply every ingredient by 2. Enter your ingredients into the recipe scaling calculator above, click the ×2 quick button (or set Original Servings to 4 and Desired Servings to 8), and click Scale Recipe. The calculator handles fractions automatically — ¾ cup becomes 1½ cups, ⅓ cup becomes ⅔ cup, and so on. Note: baking powder, baking soda and salt should be multiplied by 1.75× rather than exactly 2×.

Not proportionally. When doubling most recipes, cooking time typically increases by only 25–50%, not 100%. Keep the same oven temperature. If you split the doubled batch between two pans of the same size as the original, time stays roughly the same. If baking in one larger pan, add 25–30 minutes and check for doneness using a toothpick or thermometer rather than relying on time alone.

No. When doubling a recipe, use approximately 1.75× the amount of baking powder, baking soda or yeast rather than exactly 2×. Too much leavening agent causes baked goods to rise too rapidly and then collapse, resulting in a dense, gummy texture. The same principle applies to salt (1.75×) and strong spices like chilli powder or vanilla extract (1.5×) — add conservatively and adjust to taste.

Click the ½× quick button, or set your desired servings to half the original number. The calculator divides every ingredient by 2 and converts to the nearest practical fraction. The trickiest part of halving is eggs — when you get 1.5 eggs, the calculator flags this. The solution: crack a whole egg, whisk it, then measure approximately 25ml (half a medium egg) by weight or volume.

The recipe conversion factor is: Desired servings ÷ Original servings. Multiply every ingredient by this number to scale the recipe. For example, to scale from 4 servings to 10, the factor is 10÷4 = 2.5. To scale from 12 to 4, the factor is 4÷12 = 0.333 (one-third). Our calculator computes this automatically and applies smart fraction rounding so your measurements are practical to use in the kitchen.

Yes — enter any number in the "Desired servings" field. The calculator computes the exact multiplier and scales every ingredient precisely. For example, scaling from 6 servings to 9 gives a factor of 1.5, so 2 cups of flour becomes 3 cups. Results are rounded to the nearest common kitchen fraction (⅛, ¼, ⅓, ½, ⅔, ¾) so the measurements are practical to use without decimal arithmetic.