Recipe Conversion Calculator
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About Recipe Scaling
A recipe for 4 meeting a table of 6 is a math problem disguised as a cooking problem — and doing it per-ingredient in your head mid-prep is how the flour ends up doubled while the butter didn't. One factor, written down, applied to every line: that's the whole method.
Enter the recipe's serving count, your target, and any ingredient amount — the calculator gives the factor once and the scaled amount in both decimal and kitchen-fraction form. Run each ingredient through the same factor, and see the honest exceptions below before scaling the cayenne.
The fraction arithmetic behind ⅔ of ¾ cup lives in the Fraction Calculator
The One-Factor Method
Compute once, apply everywhere:
Factor = servings needed ÷ recipe's servings Each ingredient × factor
Worked example: a 4-serving recipe for 6 people → factor 1.5 — so 2 cups of flour becomes 3, 1 tsp of vanilla becomes 1½. Scaling down works identically: 6 servings to 2 is factor 0.333, turning 1½ cups into ½.
Kitchen Measurement Conversions
The conversions scaling constantly needs — US kitchen measures:
| This | Equals | This | Equals |
|---|---|---|---|
| 1 cup | 16 tbsp | 1 tbsp | 3 tsp |
| ¾ cup | 12 tbsp | ½ tbsp | 1½ tsp |
| ⅔ cup | 10 tbsp + 2 tsp | 1 cup | 8 fl oz |
| ½ cup | 8 tbsp | 1 pint | 2 cups |
| ⅓ cup | 5 tbsp + 1 tsp | 1 quart | 4 cups |
| ¼ cup | 4 tbsp | 1 gallon | 16 cups |
The scaling-friendly trick: convert awkward results downward — 1.5 tbsp is easier measured as 4½ tsp, and ⅛ cup is just 2 tbsp.
What Doesn't Scale Linearly
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Frequently Asked Questions
How do I scale a recipe from 4 to 6 servings?
Multiply every ingredient by 6 ÷ 4 = 1.5: two cups become three, 1 tsp becomes 1½. Write the factor down before you start and apply it line by line — the calculator converts each amount and gives kitchen-fraction equivalents.
How do I cut a recipe in half?
Factor 0.5 on everything, with the awkward cases converted downward: half of ¾ cup is 6 tbsp; half of ⅓ cup is 2 tbsp + 2 tsp; half an egg is about 2 tbsp of beaten egg (crack, whisk, measure).
Do spices scale the same as other ingredients?
Not reliably — heat and strong aromatics intensify beyond proportion at big multiples. The working rule: scale seasoning to ~75% of the math when doubling or more, then adjust at the end by taste. Salt in baking is the exception — keep it proportional.
Does cooking time double when I double a recipe?
No — time follows depth and mass, not the factor. Same pan depth in two pans: nearly the original time. One deeper pan: meaningfully longer at the same temperature, tested by thermometer or skewer rather than the clock.
Why do bakers use weights instead of cups?
Because scaling and consistency both break on volume: a “cup of flour” varies ±20% with packing. Grams scale perfectly by any factor and remove the fraction gymnastics entirely — 1.5 × 240 g is just 360 g.
How do I scale a recipe by pan size instead of servings?
Use pan AREAS as the factor: going from an 8×8 (64 in²) to a 9×13 (117 in²) is ×1.83 — close to doubling. Round pans: area = πr², so 8-inch → 9-inch is ×1.27. Keep depth similar and the original bake time stays close.
Methodology. This calculator uses standard, peer-reviewed mathematical formulas. It is reviewed and maintained by the Vast Calculators editorial team.
Last updated · July 11, 2026
Results are estimates for general use; verify critical figures independently.