Flour Substitute Calculator
Tell it how much all-purpose flour your recipe calls for. It works out how much you can actually replace with the flour you have, what to add so the recipe still works, and what changes nutritionally.
Work out the swap
Enter an amount first.
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Why you cannot just swap cup for cup
Flour is not filler. The proteins in wheat link up into gluten when you mix the dough, and that elastic net is what traps gas and holds the crumb up. Almond, coconut, rice and buckwheat flours have no gluten at all, so swapping the whole amount removes the structure rather than the ingredient.
On top of that, each flour behaves differently: almond flour is about half fat, so dough slackens and spreads. Coconut flour is a third fibre and drinks liquid. And a cup is a volume, not a weight — a cup of all-purpose flour is 120 grams, a cup of almond flour 96 grams, so equal cups are not equal amounts.
What the maximum share means
The number the calculator gives is the share of the flour that can be replaced while the recipe still behaves. Replace that much and leave the rest as wheat flour. Going past it does not fail gradually — bakes turn dense, crumbly and flat fairly abruptly.
Yeast bread is the strictest case, because that is where gluten does the most work. The calculator halves the share when you tell it you are baking with yeast.
Sources
Nutrition: USDA FoodData Central. Kitchen ratios: King Arthur Baking, Bob’s Red Mill and Iowa State Extension.
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