Scale a recipe from 4 servings to 7 without guessing
A recipe’s serving count supplies a scaling factor. Apply it to ingredient quantities while treating cooking conditions as a separate question.
Ratio calculator →Find the multiplier
Going from 4 portions to 7 gives a factor of 7/4 = 1.75. An ingredient listed as 200 g becomes 350 g. In the ratio tool use a=4 portions, b=200 g and c=7 portions; d is 350 g. Keeping the correspondence written beside the numbers avoids accidentally inverting the factor and shrinking the recipe instead.
Keep measurement types consistent
Multiply each ingredient in its stated unit, or convert it properly before calculation. Mass and volume are not interchangeable without an appropriate density or product-specific conversion. A recipe calling for grams should not silently become the same number of millilitres. Whole items such as eggs may require practical rounding or a recipe-specific method rather than mechanically rounding every ingredient upward.
Do not multiply the cooking time blindly
A 1.75-fold ingredient increase does not automatically require 1.75 times the cooking time or temperature. Pan dimensions, food thickness and the cooking method affect the process. Use tested preparation guidance and appropriate food-safety checks for the dish. The ratio tool handles quantity arithmetic; it cannot verify that a scaled recipe will cook evenly, taste identical or suit a particular dietary requirement. Scaling 350 g from 7 portions back to 4 portions should return the original 200 g ingredient quantity.
Try the calculators
- Ratio calculator
Find d in a:b = c:d from a, b and c.
- Fraction calculator
Add, subtract, multiply and divide fractions.
- Percentage calculator
Find a percentage of any number.