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Recipe Scaling Calculator
Scale every ingredient when you change the number of servings.
Start each line with its quantity. Lines without a number are left as they are.
Scale factor
How it works
Scale factor = new servings ÷ old servings New quantity = old quantity × scale factor
Worked example: a recipe for 4 servings uses 2 cups of flour and 200 g of butter. For 6 servings the scale factor is 6 ÷ 4 = 1.50, so the flour becomes 2 × 1.50 = 3 cups and the butter becomes 200 × 1.50 = 300 g.
Frequently asked questions
What if an ingredient has no number, like “salt to taste”?
Leave it as it is. The calculator only scales lines that start with a number, so seasoning notes and method hints pass through unchanged.
Should I round the scaled amounts?
For most ingredients, yes — round to a sensible kitchen measure. The calculator shows two decimals so you can decide; half an egg, for example, is best rounded up or down.
Does scaling change the cooking time?
Usually, but not in proportion. A doubled cake needs longer in the oven, but not twice as long — check it early and judge by look, not by the clock.
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