Recipe Scaler
Enter your original recipe and target serving size, and this scaler recalculates every ingredient instantly.
About
About Recipe Scaler (Ingredient Adjuster)
Doubling a recipe sounds like simple multiplication until you hit three-quarters of a teaspoon of baking soda or two-thirds of a cup of buttermilk, fractions that get genuinely awkward to scale by hand without a calculator or a lot of mental math. This scaler converts every measurement to a precise decimal, applies your scaling factor, and converts back to readable kitchen fractions so nothing gets rounded wrong.
Baking punishes measurement errors more than general cooking does, it's closer to chemistry than cooking in the sense that leavening agents, fats, and liquids need to stay in proportion for the final texture to come out right. Scaling a cake recipe up or down by hand risks small rounding errors that compound across multiple ingredients, which is exactly the kind of mistake a precise scaler avoids.
One nuance worth knowing: leavening agents like baking soda and baking powder don't always scale perfectly linearly in very large batches, professional bakers sometimes reduce the proportional increase slightly when scaling way up, since too much leavening can actually collapse a structure rather than help it rise. For typical home-scale adjustments, straightforward scaling works fine.
Enter your original recipe's serving size and your target serving size, or a direct scaling multiplier, along with each ingredient's quantity. The scaler recalculates every measurement and displays clean, readable fractions for the adjusted amounts.
Family recipes are often personal and sometimes closely guarded. Everything calculates in your browser, with no ingredient lists transmitted to or stored on a server.
FAQ
Frequently asked questions
How does the scaler handle awkward fractions?
It converts fractions like 3/4 teaspoon into decimals internally for precise multiplication, then converts the result back into standard, readable kitchen fractions.
Does this work well for baking recipes specifically?
Yes, it's especially useful there, since baking depends on maintaining precise ratios between flour, leavening agents, and liquids that general cooking is more forgiving about.
Do cooking times change when I scale a recipe up?
Often yes, a larger scaled-up dish, like a doubled casserole, may need extra time in the oven since more mass takes longer for heat to fully penetrate to the center.
Does scaling a recipe up always work, or are there limits?
Most recipes scale reliably up to about 3 to 4 times the original, but leavening agents like baking soda and baking powder, along with spices and salt, don't always scale perfectly linearly at larger multiples, so taste and adjust seasoning rather than trusting the scaled number blindly for very large batches.
Does it work offline once loaded?
Once the page loads, the calculations run locally in your browser's memory, so it keeps working even with a spotty kitchen Wi-Fi connection.
Should pan size change when I scale a recipe up or down?
Yes, and it's one of the most commonly missed steps. Doubling a recipe without a proportionally larger pan changes cooking time and can affect how evenly it bakes, so check that your pan's volume scales along with the ingredient amounts, not just the ingredients themselves.
Related tools
View all life & everyday tools →Baking Conversion Calculator
Convert baking measurements between cups, grams, tablespoons and ml.
Open toolCoffee to Water Ratio Calculator
Get the right coffee to water ratio for your cup count and strength.
Open toolCooking Time by Weight Calculator
Estimate cooking time for meat from its type and weight.
Open toolFreezing Time Estimator
Estimate how long a food takes to freeze solid.
Open tool