Paste ingredients below — scaling recalculates instantly.
4 servings → 6 servings (×1.5×)
Scaling a recipe means applying one ratio to every ingredient line. The arithmetic is simple, but pan sizes, leavening, and hydration need small corrections so a doubled cake or a tripled bread dough behaves like the original. This guide walks through the formulas the scaler above uses, the pan swaps that keep a batter the same depth, and how baker's percentages let you resize any formula from a single number.
Find the factor once, then multiply every ingredient by it. The factor is the servings you want divided by the servings the recipe was written for.
A recipe written for 4 scaled to 8 uses a factor of 2 (a recipe doubler); scaled to 6 it uses 1.5; halved, 0.5. Because the same factor touches every line, the recipe's internal ratios stay balanced, which is exactly what keeps flavor and texture intact.
When you change pans, compare their area, not their diameter. A cake bakes by the depth and surface area of batter, so the batter factor you need is the new pan's area divided by the original pan's area.
Scaling an 8-inch round to a 9-inch round is the classic case: the areas are about 50 in² and 63 in², a factor of roughly 1.26, so you need about a quarter more batter, not the 12.5% the diameter difference suggests.
Multiply your recipe by the batter factor to fill a new pan to the same depth.
| Pan swap | Batter factor | Area comparison |
|---|---|---|
| 8" round → 9" round | 1.27× (+27%) | ≈ 50 in² → 64 in² |
| 9" round → 10" round | 1.23× (+23%) | ≈ 64 in² → 79 in² |
| 8" square → 9" square | 1.27× (+27%) | ≈ 64 in² → 81 in² |
| 8" round → 8" square | 1.27× (+27%) | ≈ 50 in² → 64 in² |
| 9×13" pan → two 8" rounds | 0.86× (-14%) | ≈ 117 in² → 101 in² |
Keep the oven temperature the same and change the time instead. A larger, deeper pan bakes a little longer and a shallower one bakes faster, so test for doneness a few minutes early or late rather than scaling the minutes directly.
Most ingredients scale linearly, but a few are best adjusted by feel. Use the exact scaled amount from the calculator as your starting point, then apply these corrections.
Baker's percentages express every ingredient relative to the flour, which is always set to 100%. The ratios never change, so a formula scales to any size by choosing a new flour weight and multiplying each percentage through.
A 65%-hydration lean dough, resized from 500 g to 1,000 g of flour.
| Ingredient | Baker's % | 500 g flour | 1000 g flour |
|---|---|---|---|
| Flour | 100% | 500 g | 1000 g |
| Water | 65% | 325 g | 650 g |
| Salt | 2% | 10 g | 20 g |
| Instant yeast | 1% | 5 g | 10 g |
| Olive oil | 3% | 15 g | 30 g |
Because flour is the constant, you can rebuild any bread or pastry recipe from its percentages alone. Double the flour weight and every other ingredient doubles with it, keeping the dough identical at any batch size.
Volume measurements vary with how an ingredient is packed, so the same cup of flour can weigh 120 g or 150 g. These reference tables convert cups, tablespoons, and teaspoons to grams and millilitres for the ingredients cooks weigh most, the numbers behind the recipe conversion calculator above and a fast cross-check when a scaled recipe lands on an awkward fraction.
Approximate weights for spooned, level measurements — weigh for baking accuracy.
| Ingredient | 1 cup | 1/2 cup | 1 tbsp | 1 tsp |
|---|---|---|---|---|
| All-purpose flour | 120 g | 60 g | 8 g | 2.6 g |
| Bread flour | 127 g | 64 g | 8 g | 2.6 g |
| Whole-wheat flour | 120 g | 60 g | 8 g | 2.6 g |
| Granulated sugar | 200 g | 100 g | 12 g | 4 g |
| Brown sugar (packed) | 220 g | 110 g | 14 g | 4.6 g |
| Powdered sugar | 120 g | 60 g | 8 g | 2.6 g |
| Butter | 227 g | 113 g | 14 g | 4.7 g |
| Honey / maple syrup | 340 g | 170 g | 21 g | 7 g |
| Cocoa powder | 100 g | 50 g | 6 g | 2 g |
| Rolled oats | 90 g | 45 g | 6 g | 2 g |
| Milk / water | 240 g | 120 g | 15 g | 5 g |
Imperial volumes converted to millilitres, tablespoons, and teaspoons.
| Volume | Millilitres | Tablespoons | Teaspoons |
|---|---|---|---|
| 1 cup | 237 mL | 16 tbsp | 48 tsp |
| 3/4 cup | 177 mL | 12 tbsp | 36 tsp |
| 2/3 cup | 158 mL | 10 2/3 tbsp | 32 tsp |
| 1/2 cup | 118 mL | 8 tbsp | 24 tsp |
| 1/3 cup | 79 mL | 5 1/3 tbsp | 16 tsp |
| 1/4 cup | 59 mL | 4 tbsp | 12 tsp |
| 1 tablespoon | 15 mL | 1 tbsp | 3 tsp |
| 1 teaspoon | 5 mL | 1/3 tbsp | 1 tsp |
Use the quick-multiply presets to double, triple, or quadruple a recipe in one click, or halve it with the ½× button. The scaler applies your chosen factor to every ingredient line instantly — so a recipe written for 4 becomes a clean, checkable list for 8, 12, or 16 without any mental math. The custom multiply field lets you enter any factor (2.5, 0.75, 1.2) for batches that do not fall on a whole number.
Enter the original yield and your desired servings and the tool computes the scaling factor for you — no ratio to calculate by hand. For baking, where hydration and leavening are sensitive, toggle the Unit Converter to metric to weigh flour, sugar, and butter in grams so every batch comes out identical. The factor applies to fractional cups and spoons too, and the results simplify back to standard measuring-tool amounts.
Switch between imperial and metric without a second calculator. The Unit Converter turns cups, tablespoons, and teaspoons into millilitres and ounces into grams using standard ingredient densities, then applies your scaling factor so you receive clean metric amounts for the new yield. Pair it with the conversion reference on the cooking conversions page for any measurement the recipe leaves ambiguous.
Recipe scaling is, at its core, a single ratio applied to every ingredient: the number of servings you want divided by the number of servings the recipe was written for. A recipe written for 4 that you need to serve 6 gets a factor of 1.5; halving it produces a factor of 0.5. The arithmetic is simple — the flavor pitfalls are not. The biggest mistake home cooks make is treating every ingredient as if it scales identically. It does not, and understanding where the math breaks down is the difference between a doubled recipe that tastes right and one that tastes off.
Liquid vs. dry measurement conversions: liquids scale cleanly by volume because they are incompressible — a cup of milk doubled is reliably two cups. Dry ingredients measured by volume are far less consistent: a cup of flour can weigh anywhere from 120 g to 150 g depending on how it was scooped. When you scale a dry ingredient by volume across a large factor, that error compounds. For small adjustments (halving or doubling a home recipe) volume is usually fine, but for anything beyond that, switch to weight. The Unit Converter toggle gives you gram and millilitre values in one step so you can move from cups to a kitchen-scale workflow without a separate calculator.
Spice scaling adjustments: spices, salt, acids, and alcohol do not scale linearly. Doubling a recipe does not mean doubling the cayenne — it means adding about 1.5 times the spice, tasting, and adjusting. Salt behaves similarly: for a doubled recipe, start at roughly 1.5 times the salt and correct to taste. Acids like lemon juice and vinegar also benefit from sub-linear scaling, because their sharpness reads more intensely in a larger volume. Use the scaler's exact output as your starting point, then trust your palate.
Baking pan ratio adjustments: when you scale a recipe, match the pan volume, not the linear dimensions. Doubling a batter into the same pan doubles the depth and changes how it bakes; instead, choose a pan with roughly twice the area or volume, or split the scaled batter between two pans of the original size. Keep the fill level similar to what the original recipe intended (about half to two-thirds full) so the leavening and bake time behave predictably, and adjust the timer rather than the temperature.
Professional kitchens scale by weight, not volume, for one reason: consistency. A cup of all-purpose flour can weigh 120 g or 150 g depending on whether it was spooned or scooped, and that 25% swing is invisible in a single batch but devastating when you multiply it across a large event. When you scale by grams or ounces, every batch comes out the same regardless of who measured it or how the ingredient was packed. This is why commercial bakeries weigh flour, sugar, and even water — small volume errors compound across large batches and ruin texture and yield.
Scaling by weight also makes the math cleaner. A recipe that calls for 500 g of flour scaled by 1.5 is exactly 750 g — no fraction to simplify, no measuring cup to hunt for. The same operation on 4 cups of flour leaves you measuring 6 cups, which may or may not be the same amount of flour as the original 4 cups. For bread, pastry, and any recipe where hydration matters, weight is not a preference — it is the only way to get repeatable results. The metric converter in this tool exists precisely to bridge that gap: paste an imperial recipe, toggle to metric, and you get the gram values you need to scale confidently.
Volume still has its place. For liquids, for small home recipes, and for quick weeknight cooking where precision is not critical, cups and tablespoons are perfectly adequate and far faster. The rule of thumb is simple: the larger the batch or the more leavening-sensitive the recipe, the more you should weigh. A doubled cake or a tripled bread dough should be weighed; a halved soup can stay in cups. Knowing when to switch is the real skill, and the converter is there to make the switch effortless when you need it.
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