Baker's Percentage

Baker's percentage, also called baker's math, is a formula convention used throughout professional and home baking where the total flour weight in a recipe is always treated as 100%, and every other ingredient is expressed as a percentage of that flour weight rather than as a percentage of the total batch. This means a dough listing 65% water is telling you that the water weighs 65% of whatever the flour weighs, whether the baker is mixing a single loaf or a hundred-loaf batch. The Baker's Percentage Calculator converts a list of ingredient weights into these percentages, or scales a formula written in percentages back into weights for any batch size.

The core advantage of baker's percentage is that it separates the shape of a formula from its size. A recipe written as 100% flour, 65% water, 2% salt, and 1% yeast describes the same dough whether it produces one loaf or fifty, because every ingredient scales proportionally with the flour. This makes baker's percentage especially useful alongside the Recipe Scaling Calculator, which handles the arithmetic of resizing a batch while baker's percentage defines the ratios that must stay constant during that resize.

Because water percentage is such a dominant factor in how a dough behaves, it is common enough to have its own dedicated name: dough hydration. Bakers routinely describe a formula by its hydration level first, since it strongly predicts whether the resulting dough will be stiff and easy to handle or slack and difficult to shape.

Ingredient Percentage = (Ingredient Weight ÷ Total Flour Weight) × 100

Where Ingredient Weight is the weight of any single ingredient (water, salt, yeast, sugar, fat, and so on) in the same units as the flour, and Total Flour Weight is the combined weight of all flour used in the recipe, which is always assigned a fixed value of 100%.

A bread formula uses 500g of flour, 325g of water, 10g of salt, and 5g of instant yeast.

Water percentage = (325 ÷ 500) × 100 = 65% Salt percentage = (10 ÷ 500) × 100 = 2% Yeast percentage = (5 ÷ 500) × 100 = 1%

This produces the baker's percentage formula 100% flour / 65% water / 2% salt / 1% yeast, which can be scaled up or down to any batch size while keeping the exact same dough character.

• Total percentages routinely exceed 100%: because flour alone is fixed at 100% and every other ingredient is added on top, a full formula's percentages commonly sum to 160% to 220% depending on how enriched the dough is.
• Water percentage is commonly called dough hydration: it is singled out from the rest of the formula because it has an outsized effect on dough stickiness, extensibility, and the openness of the finished crumb.
• Salt is typically 1.8% to 2.2% of flour weight: this narrow range balances flavor and yeast activity, since too much salt slows fermentation while too little produces a flat-tasting loaf.
• Baker's percentage makes formulas instantly scalable: multiplying every ingredient's weight by the same batch factor preserves every percentage exactly, which is why professional bakeries write and store formulas in percentage form rather than fixed weights.
• Pre-ferments and enrichments are usually expressed against total formula flour: when a recipe uses a starter or poolish that itself contains flour, that flour is typically included in the 100% base so the full formula's ratios stay accurate.