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Recipe Scaling Calculator

Resize a complete ingredient list to your desired number of portions.

Your numbers

Make it your own
Updates as you type
Recipe scaling factor
2.5×

Calculated from your inputs · rounded for display

Original servings4
Target servings10

Linear ingredient scaling only. Use decimal quantities, e.g. 0.5 instead of 1/2. No automatic volume-to-mass conversion, cooking-time or food-safety adjustment.

Your calculation, step by step

No black boxes
  1. Scale factor = 10 ÷ 4 = 2.5.
  2. Multiply each ingredient amount by 2.5; keep its original unit.
  3. Cooking time, pan size and seasoning may need separate adjustment.
Detailed results · 3 entries
IngredientOriginal amountScaled amountUnit
Flour200500g
Water120300mL
Salt410g

How to use this calculator

  1. Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
  2. Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
  3. Copy, share, save, or download your result. Saved inputs stay on this device.

How the calculation works

Scaled ingredient = original ingredient × target servings / original servings

A single ratio scales every ingredient while preserving its original unit. This is useful for preparing shopping quantities and comparing batch sizes. The arithmetic does not decide a suitable pan size, cooking duration, seasoning adjustment or safe storage procedure. Fractions should be entered as decimal numbers.

A worked example

Scaling from 4 servings to 10 uses a factor of 2.5. An ingredient of 200 g becomes 500 g.

Reading your result

Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.

Frequently asked questions

Can I download the scaled ingredient list?

Yes. The detailed table exports as CSV.

Will cooking time scale by the same factor?

No. Cooking time and equipment require separate judgment.

Sources & methodology

This calculator uses the mathematical identity and assumptions stated above. No current rates, prices, or external data are loaded. Conversion tools use international unit definitions.

Formula review: October 24, 2026. Read our methodology.