Bread Calculator

Bread formulas are written in baker percentage, a system in which total flour is defined as 100 percent and every other ingredient is expressed as a fraction of that flour weight. It is not a percentage of the whole dough, which is why the figures sum to well over 100. The convention exists because it makes a formula scale-invariant: the same description of 65 percent water, 2 percent salt and 1 percent instant yeast holds whether you are mixing a 500 gram home loaf or a 200 kilogram production batch, and it lets two recipes be compared directly regardless of yield. The usual ranges are narrow. Salt sits at 1.8 to 2.2 percent of flour weight; below about 1.5 percent the bread tastes flat and ferments too quickly, above 2.5 percent yeast activity is measurably suppressed. Instant yeast runs roughly 0.5 to 1.5 percent depending on how long a fermentation is wanted, and sourdough substitutes 15 to 25 percent of mature starter in its place, trading hours for flavor and keeping quality. Hydration between 60 and 70 percent covers most pan and sandwich loaves, while enriched doughs add about 8 to 10 percent sugar and 8 to 15 percent butter, both of which slow fermentation and therefore call for more yeast. Flour weight per loaf is conventional rather than fixed: roughly 500 grams fills a standard 9 by 5 inch pan. Doneness is measured internally, near 190 to 200 degrees F for soft breads and 205 to 210 degrees F for lean, crusty ones.

Baker percentage grew out of the industrialization of baking, when flour was purchased by the sack and formulas had to be restated for whatever batch size the mixer held. It was in common trade use across the English-speaking milling and baking industry through the twentieth century and became the standard teaching language of professional baking schools. Consistent leavening had arrived earlier: Fleischmann compressed yeast, exhibited at the 1876 Centennial Exposition in Philadelphia, gave bakers a uniform, reliable organism in place of barm and brewery yeast of unpredictable strength. The twentieth century then pulled bread in two directions at once. Industrial baking pursued speed, culminating in the Chorleywood Bread Process developed at the British Baking Industries Research Association in 1961, which used intense mechanical mixing and oxidants to produce a loaf in a few hours from lower-protein wheat. Active dry yeast, developed during the Second World War so that yeast could be shipped without refrigeration, and instant dry yeast commercialized in the 1970s, made comparable speed available to home bakers. The countercurrent came from bakers reviving long fermentation and natural leaven, notably Raymond Calvel in France and the Bread Bakers Guild of America, founded in 1993, which trained a generation of American artisan bakers. Home baking inherited both traditions, along with the gram scale and the percentage notation that make either one repeatable.