Scale recipe ingredient quantities

Multiply leading ingredient amounts by the ratio between desired and original servings.

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ToolRecipe Scaler
Input
Output
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How it works

Desired servings ÷ original servings forms one factor applied to a leading integer, decimal, fraction, or mixed fraction on each line. Results are rounded to at most three decimals, while units and ingredient wording remain untouched.

Formula
scale factor = desired servings ÷ original servings
  • Both serving counts are required and no unit conversion occurs.
  • Non-numeric instruction lines remain verbatim.

Worked example

Doubling a recipe for four
Every amount at the start of a line is scaled, the rest of the line is left alone
Input
											Ingredients: ["200g flour","1 1/2 cups milk","3 eggs"]
From: 4
To: 8
Output
												400g flour
3 cups milk
6 eggs

When to use this

Family dinners double from four to eight servings, cakes halve ingredient weights, and catering batches use non-integer serving ratios.

Edge cases

  • “Salt to taste” has no leading amount and remains unchanged instead of receiving a fabricated quantity.
  • “2–3 chillies” is a range rather than one supported number; rewrite its intended guidance before scaling.
  • Eggs and packaged items may become fractional after scaling because quantities are not silently rounded to purchasable units.