Leavening Agent Scaler
Adjust baking powder and baking soda when scaling recipes up or down.
Results
Baking powder and baking soda do not scale linearly when making large batches. Doubling a recipe can simply double the leavening, but tripling or quadrupling requires less than 3x or 4x the leavening. Too much baking powder causes baked goods to rise too fast, then collapse, and leaves a bitter metallic taste. This calculator uses a reduced scaling formula above 2x.
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Frequently asked questions
You can double it safely. The problem starts at 3x and above. Excess leavening causes over-rising, collapse and bitter flavor. Above 2x, increase leavening by about 70% for each additional multiple.
Too much baking powder causes bread to rise too quickly, creating large air pockets that collapse. It also leaves a bitter, metallic, soapy taste. The texture becomes coarse and crumbly.
The standard ratio is 1-1.25 teaspoons of baking powder per cup of flour. For baking soda, use 1/4 teaspoon per cup of flour (baking soda is 3-4x stronger).
For 4x or larger, making separate batches is safer and produces more reliable results. This is especially true for delicate baked goods like cakes and souffles.
Yes, both need reduced scaling above 2x. However, baking soda also needs an acidic ingredient (buttermilk, yogurt, vinegar) to activate. Make sure you scale the acid proportionally too.