Last updated: July 2026
Scale servings, switch units, and copy the adjusted recipe in one workspace.
Scale any recipe up or down for any number of servings - and convert between US cups and metric grams at the same time. Enter your original recipe's serving size and ingredients, set your target serving size, and every ingredient updates instantly. You can also switch the entire recipe between US measurements and metric with one click. The tool flags ingredients like salt, baking powder, and spices that do not always scale linearly, so you know where to use judgment.
Flagship recipe scaling tool
x2.0US mode favors cups, tablespoons, teaspoons, ounces, pounds, and Fahrenheit. Metric mode favors grams, milliliters, kilograms, and Celsius.
Scaling science
Scaling a recipe by multiplying every ingredient by the same factor works perfectly for most ingredients, but not all. Some ingredients in a recipe serve chemical or structural functions where the relationship between quantity and effect is not linear. Doubling a recipe does not always mean doubling every ingredient, and halving a recipe can sometimes require more than half the leavening to achieve the same rise. Understanding which ingredients need adjustment, and in which direction, is the difference between a scaled recipe that works and one that fails.
When scaling up significantly, especially 3x or more, reduce baking powder and baking soda by 10-25% from the mathematically scaled amount. Too much baking powder causes rapid rise followed by collapse, and it can leave a metallic or soapy taste. When scaling down to very small batches, such as one-quarter scale or less, you may need slightly more leavening proportionally to achieve adequate rise.
Salt is a flavor enhancer, and flavor perception is not linear. Doubling a recipe does not mean the dish always needs exactly double the salt. When scaling up, start with 75-80% of the mathematically scaled salt amount and adjust to taste. When scaling down, use the full proportional amount because salt under-scaling is usually less noticeable than over-scaling.
Strong flavors scale sublinearly at large multiples. When tripling or quadrupling a recipe, use 2-2.5x the spice amount rather than 3-4x, then taste and adjust. Vanilla extract in particular can become overpowering at large scales, while garlic, pepper, cinnamon, and chile can dominate a batch before the base ingredients taste balanced.
Eggs are the hardest ingredient to scale because they come in discrete units. When a scaled recipe calls for 1.5 eggs, use 2 eggs for a slightly richer result, use 1 egg for a slightly leaner result, or beat 2 eggs and use half for the most precise version. For large-scale baking, egg weight in grams is the most reliable scaling method.
Two things that never scale with serving size are oven temperature and baking time, with one exception. Oven temperature is always the same regardless of batch size. You do not increase the temperature when doubling a recipe. Baking time stays approximately the same when you are making more of the same-sized item, such as two trays of cookies instead of one. However, if you change the pan size or thickness of the item, for example baking a doubled cake recipe in one large pan instead of two standard pans, baking time increases and you need to test for doneness.
When scaling baked goods that use a specific pan size, the pan size needs to scale with the recipe or the baking time needs to be adjusted. A doubled cake recipe baked in the original pan size will overflow or stay underbaked in the center. As a general rule, doubling a recipe requires a pan with approximately double the area, not double the diameter. A 9-inch round pan has about 63.6 square inches of area; two 9-inch pans or one 13x9-inch pan, about 117 square inches, is needed for a doubled recipe.
Large batches can fail even when the math is correct because equipment behaves differently at scale. A home mixer that creams one stick of butter perfectly may smear four sticks around the bowl without enough friction, leaving dense pockets in the finished cake. A stockpot that simmers one batch cleanly may reduce too slowly when filled near the rim. Cooling also changes: a double batch of jam, caramel, frosting, or custard holds heat longer and can keep thickening after the original recipe says it is done. When scaling beyond 2x, use ingredient math as the starting point, then check bowl capacity, pan depth, stirring clearance, cooling surface area, garnish timing, and serving temperature before cooking.
Whole recipe unit switch
One of the most requested features in recipe tools is the ability to convert an entire recipe from US measurements to metric, or from metric back to US, in one step. This is particularly useful for US cooks using international recipes. A British recipe that lists 250g flour, 120ml milk, and 85g butter can be converted to roughly 2 cups flour, 1/2 cup milk, and 6 tablespoons butter for US measuring tools.
It is just as useful for international cooks using US recipes. An American recipe that lists 2 cups flour, 1/2 cup butter, and 1 tablespoon vanilla can be converted to metric estimates such as 250g flour, 113g butter, and 15ml vanilla for a kitchen scale. The important caveat is dry ingredients: converting cups to grams requires knowing the ingredient's density. This tool uses standard density values for common ingredients, including flour at about 120-125g per cup, sugar at 200g per cup, and butter at 227g per cup. Less common ingredients are approximated from similar density data.
Liquid ingredients convert cleanly because volume relationships do not require density assumptions: 1 cup = 240ml, 1 tablespoon = 15ml, and 1 teaspoon = 5ml. For precision baking such as croissants, macarons, and chiffon cake, use gram values from the original metric recipe whenever possible rather than converting to cups. Cup-to-gram conversion introduces rounding errors, and those errors compound across several ingredients. The practical recommendation is simple: use metric mode when precision matters, and US mode when convenience matters.
Quick reference
For the most common recipe scaling scenarios, use this table when you do not need the full tool. It covers half batches, one-and-a-half batches, double batches, and triple batches for the measurements that appear most often in baking recipes. Use it as a fast mental check, then use the converter above for a full ingredient list.
| Original | 1/2x | 1.5x | 2x | 3x |
|---|---|---|---|---|
| 1/4 tsp | 1/8 tsp | 3/8 tsp | 1/2 tsp | 3/4 tsp |
| 1/2 tsp | 1/4 tsp | 3/4 tsp | 1 tsp | 1 1/2 tsp |
| 1 tsp | 1/2 tsp | 1 1/2 tsp | 2 tsp | 1 tbsp |
| 1 tbsp | 1 1/2 tsp | 1 1/2 tbsp | 2 tbsp | 3 tbsp |
| 1/4 cup | 2 tbsp | 6 tbsp | 1/2 cup | 3/4 cup |
| 1/3 cup | 2 tbsp + 2 tsp | 1/2 cup | 2/3 cup | 1 cup |
| 1/2 cup | 1/4 cup | 3/4 cup | 1 cup | 1 1/2 cups |
| 3/4 cup | 6 tbsp | 1 cup + 2 tbsp | 1 1/2 cups | 2 1/4 cups |
| 1 cup | 1/2 cup | 1 1/2 cups | 2 cups | 3 cups |
| 1 egg | 1/2 egg* | 1 1/2 eggs* | 2 eggs | 3 eggs |
*1/2 egg = beat 1 egg and use half by weight; 1 1/2 eggs = 1 egg plus half of another.
FAQ
Divide the target servings by the original servings to get the scale factor: 6 divided by 4 equals 1.5. Multiply every ingredient by 1.5. For example, 1 cup flour becomes 1 1/2 cups, 2 eggs becomes 3 eggs, and 1/2 tsp salt becomes 3/4 tsp. Use the recipe converter above to handle all ingredients simultaneously.
Most recipes can be doubled successfully, with a few caveats. Multiply all ingredients by 2, but consider reducing baking powder and baking soda by about 10-15% at double scale. Oven temperature stays the same. Baking time may increase slightly if you use a larger pan, so test for doneness rather than relying only on the original time.
Use the Metric toggle in the recipe converter above to convert all ingredients from US cups to grams simultaneously. For manual conversion, flour is about 120-125g per cup, sugar is about 200g per cup, butter is 227g per cup, and liquids are 240ml per cup. For precision baking, use original gram values when available.
Baking time does not change when you make more of the same-sized item, such as two trays of cookies instead of one. However, if you change the pan size or make a thicker item, baking time increases. Larger volume usually means longer baking time, so test with a toothpick, thermometer, or visual doneness cue.
Halving eggs is the trickiest part of scaling down. For 1 egg, beat the egg thoroughly, weigh it, and use half by weight. A large egg is usually 50-55g without the shell, so half is about 25-28g. You can also use one whole egg for a richer result, or just the yolk or white depending on the recipe.
Flavor perception is not perfectly linear. Salt and spices are the most common culprits because strong flavors can taste more intense when scaled up. Start with 75-80% of the calculated salt and spice amounts, then taste and adjust. Over-scaled leavening agents can also change flavor by leaving a metallic or soapy note.
Use the US toggle in the recipe converter above. For manual estimates, 100g flour is roughly 3/4 cup plus 2 tablespoons, 100g sugar is about 1/2 cup, 100g butter is about 7 tablespoons, and 100ml liquid is about 6 tablespoons plus 2 teaspoons. Dry ingredient conversions from grams to cups are approximations.
Yes, but with important adjustments. At 10x scale, reduce leavening agents to about 7-8x, reduce salt and spices to about 7-8x, and taste before serving. Also check equipment limits because a home stand mixer rarely handles 10x a standard recipe. Multiple smaller batches are often safer than one enormous batch.
The basic formula is: New Amount = Original Amount x (Target Servings divided by Original Servings). To scale from 4 to 10 servings, the scale factor is 10 divided by 4, or 2.5. Every ingredient is multiplied by 2.5, except leavening, salt, and strong spices at large scale factors.
Yes. The converter works for both baking and cooking recipes. For cooking, linear scaling works well for most ingredients. For baking, pay attention to warnings for leavening agents, eggs, salt, and strong spices. The oven temperature field converts between Celsius and Fahrenheit but does not change with serving size.
Methodology
Recipe scaling calculations use linear multiplication, where New Amount = Original Amount x Scale Factor. Non-linear scaling recommendations for leavening agents, salt, and spices are based on consensus guidance from professional culinary references including the Culinary Institute of America's Baking and Pastry textbook and King Arthur Baking professional scaling guidance. US-to-metric unit conversions use standard values: 1 cup = 240ml for liquids, 1 tablespoon = 15ml, and 1 teaspoon = 5ml. Dry ingredient gram values use standard density references: all-purpose flour 120-125g per cup, granulated sugar 200g per cup, and butter 227g per cup. Egg scaling recommendations reflect professional pastry practice. Pan area calculations use standard geometric formulas for practical batch planning.