Smart Math guide · Everyday Math

Scale Recipes with Ratios

Multiply every ingredient by the same scale factor to preserve proportions.

All levelsWorked example includedSelf-check included
← Smart MathRelated calculators
The method

How to use it

  1. Compute new servings ÷ original servings.
  2. Multiply each ingredient by that factor.
  3. Convert awkward units if helpful.
Worked example

See it in action

Recipe serves 4; need 10: scale factor 10/4=2.5. Two cups becomes five cups.

Check your thinking

How to verify it

All ingredient ratios should stay unchanged.

Keep learning

More Everyday Math guides

Everyday Math

Compare Unit Prices

Divide total price by a common unit so differently sized packages can be compared fairly.

Read guide →
Everyday Math

Understand Stacked Discounts

Successive discounts multiply; a second discount applies to the already-discounted price.

Read guide →
Everyday Math

Estimate Tips Quickly

Use 10% as an anchor and combine it to get common tip rates.

Read guide →
Everyday Math

Use the Distance–Rate–Time Triangle

Distance, rate, and time are linked by d=rt.

Read guide →
CalculatorWiser

Calculators, math tools, reference tables, games, guides and a growing math library.

All calculators · Math Blog
Latest from the Math BlogWho invented mathematics?Euclid: life, ideas, and mathematical legacyWhy zero changed mathematicsMaya mathematics and calendars
Policies & trustPrivacy PolicyCookie PolicyAdvertising & Affiliate DisclosureTerms of UseDisclaimerEditorial PolicyAccessibilityPrivacy Choices