Three losses between the flour bin and the shelf
A batch is sized backward from the thing you are selling or eating, and there are three places weight disappears on the way. Bake loss is the biggest: water leaves as steam, and a free-standing loaf commonly gives up eleven to thirteen percent of its dough weight, while a lidded pan loaf gives up less and a small roll gives up more. Scaling and handling loss is the dough left on the bowl, the scraper and the bench, usually one to three percent. Then there is the piece that gets dropped, which no arithmetic covers.
Skipping the first of those is the classic error. Twenty-four loaves that should weigh 450 g on the shelf need 450 ÷ 0.88 = 511 g of dough each at twelve percent loss, which is 12.3 kg scaled, or 12.5 kg mixed once you allow two percent for the bowl. Size the mix at 24 × 450 and every loaf comes out at 396 g, which is a short-weight loaf if you are selling it and a puzzling small one if you are not.
Bake loss is a measurement, not a table
| What changes it | Which direction | Why |
|---|---|---|
| Small pieces | More loss | More surface per gram, so more crust and more evaporation |
| A lid or a covered pan | Less loss | The steam has nowhere to go for most of the bake |
| A longer bake at a lower temperature | More loss | Time at temperature is what drives water off |
| Steam early in the bake | Slightly less | The crust sets later, so the surface stays open longer, but the effect is small |
| Weighing while still warm | Looks like less | A loaf keeps losing weight for an hour after it comes out |
The last row catches people out. Weigh the loaf cool, not hot, or your figure will be two or three points low and the batch will run short every time.
Why a bowl is rated in pounds of dough and not in quarts of it
A mixer bowl has a volume, but the limit that matters is torque, not space. A stiff dough at 55% hydration loads the motor and the gearbox far harder than a slack one at 80%, so machine documentation gives dough capacity by stiffness, and the same bowl might be rated at half the weight for the stiff dough. That is why the capacity figure on this page is something you type in from your own machine rather than a constant.
Filling to the rated maximum is also not the same as mixing well. A bowl loaded to the top does not develop dough evenly because the hook cannot move the whole mass, and small batches in a large bowl have the opposite problem, where the dough rides above the tool. Most bakers end up working in a band well inside the rating at both ends.
Splitting a batch honestly
When a batch needs two mixes, divide it by weight rather than by pieces. Mixing 12 loaves worth and then 12 more sounds equivalent, but the two mixes will not develop identically and the second one has been sitting as scaled ingredients while the first was mixed. Dividing the total dough by the number of mixes and scaling the flour and water for each is the version that produces two batches you can treat the same.
For the formula in percentages, the bakers percentage calculator works both directions. If the pieces are pizzas rather than loaves, the pizza dough weight calculator gets the piece weight from the pan size first. Once you know how many pieces there are, the oven load and bake schedule calculator turns them into oven loads and a finish time, and for the food-cost side of a production day the prep batch size calculator and the recipe cost calculator take your own prices.
Questions people ask
How much dough do I need for a 1 lb loaf?
More than a pound, by the bake loss. A 454 g finished loaf at twelve percent loss started as 454 ÷ 0.88, about 516 g of dough. At eight percent, which is closer to a lidded pan loaf, it is 493 g. The only way to get your own figure is to weigh a piece in and the same piece out once it has cooled, because the number depends on the shape, the pan, the oven and how long you bake, and any single figure quoted for it will be wrong for most breads.
What percentage of weight does bread lose in the oven?
It varies enough that the measurement is worth more than any quoted range. Free-standing hearth loaves are commonly in the low teens, pan loaves with a lid lower, small rolls higher because they have far more surface per gram. Two things skew the figure if you are measuring: weigh the loaf cold, since it keeps losing weight for an hour after it comes out, and weigh the same piece rather than comparing an average dough weight to an average loaf weight.
How much dough can a 20 quart mixer handle?
That is a question for the documentation on your specific machine, because the answer depends on the dough as much as the bowl. Manufacturers rate dough capacity against a stated stiffness, and a stiff, low-hydration dough can cut the rating substantially compared with a slack one. Enter your own figure in the capacity field. Running a planetary mixer over its rated dough load is a good way to strip a gear, and the machine will usually tell you by walking, smoking or stalling before it does.
Should I mix one big batch or two smaller ones?
Whichever fits inside the machine rating with margin. A batch at 95% of the rating develops unevenly and stresses the mixer; a batch at 20% of it rides above the hook and never gets worked properly. If the arithmetic lands you at 1.1 mixes, the choices are to bake fewer pieces, make them smaller, or accept two mixes and divide the dough by weight rather than by piece count.
Why does the flour row carry the rounding?
So the ingredient rows always add up to the dough weight above them. Each ingredient is rounded to the milligram from a percentage, and those roundings do not cancel. Rather than showing a total that disagrees with its own rows by a fraction of a gram, the flour figure absorbs the difference, which is where it matters least: a tenth of a gram of flour in a twelve kilogram mix is nothing, whereas a total that does not reconcile is the sort of thing you spend ten minutes chasing.