Recipe Scaler
Scale every ingredient from the original servings to a new serving count. Enter fractions, select each ingredient’s units and inspect a complete quantity table.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Divide the target servings by the original servings to get the scaling factor. Multiply each ingredient quantity by the same factor. Keep mass, volume and count separate and convert only within each ingredient’s selected quantity type.
factor = target servings / original servings; new ingredient amount = original ingredient amount × factor
Worked example
Scaling a 4-serving recipe to 6 servings gives a factor of 1.5. Flour 250 g becomes 375 g, milk 200 mL becomes 300 mL, and 2 eggs become 3 eggs. An original 1/2 cup becomes 3/4 cup numerically.
Assumptions and input details
Use decimal numbers, fractions such as 1/2, or mixed numbers such as 1 1/2. Regional cups and spoons have distinct definitions. Do not convert flour grams to cups without a measured density. Fractional item counts are shown rather than rounded automatically. This is proportional ingredient scaling; cooking time, seasoning, leavening and pan geometry may need separate judgment. Names and quantities are not uploaded or saved.
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
The 19 mass definitions distinguish avoirdupois and troy measures, metric and regional measures. Japanese kin is 600 g; mainland Chinese shijin is 500 g.
The 36 volume definitions distinguish US liquid, US dry and Imperial measures. Cups carry an explicit definition. Japanese shō is 2401/1331 L and a gō is one tenth of it; the explicitly labelled 180 mL rice cup is separate.
Regional measures are not interchangeable merely because their names look similar. This is a documented selection, not a claim to include every historical unit.
NIST measurement tables · UK Imperial definitions · Japanese traditional units · Mainland China and Hong Kong unit distinctions
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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