Recipe Scaler
Scale a recipe from one serving count to another, with fraction-aware rounding so 1/3 cup becomes 1/2 cup, not 0.67 cup. Leavening and salt get a warning — they do not scale linearly.
Scale factor: ×2 (4 → 8 servings)
Ingredients
Scaled recipe — 4 → 8 servings (×2)
×2 — scale factor
| Ingredient | Original | Scaled |
|---|---|---|
| All-purpose flour | 2 cups | 4 cups (4) |
| Granulated sugar | 1 cups | 2 cups (2) |
| Butter | 0.5 cups | 1 cups (1) |
Do not scale blindly: when doubling, use about 1.5× the baking powder, soda or yeast (not 2×), add salt to taste, and expect a longer baking time — check the baking time adjuster.
Formula used: Scale factor = target servings ÷ original servings. Every amount × factor, rounded to kitchen fractions.
How the recipe scaler works
Enter the original serving count and the serving count you want, then add each ingredient amount. The tool multiplies every amount by the same factor and rounds to kitchen-friendly fractions — 1/3 cup scaled by 1.5 becomes 1/2 cup, not 0.5 cup written as a decimal. It also scales grams and millilitres, where no rounding is needed.
Watch out for
Three things do not scale linearly. Leavening (baking powder, soda, yeast) should be scaled by less than the full factor when doubling — about 1.5× instead of 2× — or the cake can rise and collapse. Salt should be added to taste, not doubled blindly. And baking time does not double when you double a recipe; a larger cake takes longer, but not twice as long. Use the baking time adjuster for that. For a simple double, the recipe doubling calculator is faster.
Try next: Oven Temperature Converter · Pan Size Converter · Baking Time Adjuster
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