Baker’s Percentage Calculator
Converts any bread formula between percentages, a flour weight and a total dough weight — including the inversion that answers the question bakers actually ask: how much flour do I weigh to fill this tin?
Bakers Percentage Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Percentages describe proportions, not process; time, temperature and technique are outside the arithmetic.
- A preferment's flour and water must be counted in the totals separately, which the dedicated sourdough page handles.
- Teaspoon conversions are nominal manufacturer figures and vary with how the spoon is filled.
- Does not model flour absorption differences between white, whole grain and rye at the same stated hydration.
In short: In baker’s percentage flour is always 100% and every other ingredient is a percentage of the flour weight, so the percentages deliberately sum past 100. Running it forwards is easy; the useful direction is backwards. To land on a target dough weight, flour = total ÷ (1 + hydration + salt + yeast + fat + sugar) — so 1,000 g of dough at 65/2/1 needs 595 g of flour, not 1,000 g minus the water.
Formula
ingredient % = ingredient weight ÷ flour weight × 100
total dough = flour × (1 + hydration + salt + yeast + fat + sugar + other)
∴ flour = total dough ÷ (1 + Σ all percentages)
flour from any known ingredient = weight ÷ its percentage
[('flour = 100%', 'The reference. Never a percentage of anything itself.'), ('Σ% > 100', 'Correct and expected: percentages are against flour, not against the batch.'), ('1 + Σ%', 'The multiplier from flour to total dough, and the divisor from total dough back to flour.'), ('2% salt', 'The near-universal anchor. Below 1.5% tastes flat; above 2.5% retards the yeast.')]
Worked Example
- Write every ingredient against the flour. Divide each weight by the flour weight and multiply by 100.
- Check the sum. It should exceed 100. A lean bread is near 168%.
- Scale by choosing any one anchor. Flour, total dough, water or a single known ingredient — any one rebuilds the rest.
- Invert when the constraint is physical. Total dough divided by one plus the sum of the percentages gives the flour.
- Weigh the salt rather than spooning it. Teaspoon weights differ by 2.14x between salt types.
A formula at 65% hydration, 2% salt and 1% yeast sums to 168%. From 1,000 g of flour that is 650 g of water, 20 g of salt and 10 g of yeast for 1,680 g of dough. Reverse it and a 1,000 g dough target needs 595 g of flour — not the 980 g you would get by subtracting the water, which is the mistake the inversion exists to prevent.
Strengths & Limits Of This Model
Where this engine is strong
- Handles the inversion from total dough to flour, which most tools omit
- Rebuilds a whole formula from any single known ingredient weight
- Explains why the percentages correctly exceed 100
- Exposes the 2.14x salt spread that breaks volumetric measuring
Where it stops
- Assumes the percentages you enter are already against flour weight
- Preferments need the separate sourdough treatment to stay accurate
- Cannot judge whether a formula will actually handle well
Practical Use Cases
Scaling a formula to the flour you actually have
Percentages are batch-size independent, so 700 g of flour rebuilds every other quantity immediately.
Sizing a batch to a tin, a basket or a mixer
The constraint is a total weight, which means inverting the formula rather than multiplying it.
Comparing two recipes written in different units
Converting both to percentages makes an American cup recipe and a European gram recipe directly comparable.
Recovering a formula from a single remembered number
If you know one ingredient weight and its percentage, the whole recipe follows.
Methodology & Editorial Standards
The framework implemented here is the standard professional convention in which flour is defined as 100% and every other ingredient is expressed as a percentage of the flour weight, so that the percentages sum above 100 for any real formula. Four entry points are supported and all resolve to the same flour weight: a known flour weight is used directly; a known total dough weight is inverted by dividing by one plus the sum of the percentages; a known water weight is divided by the hydration; and any single ingredient weight is divided by its own percentage. The inversion is given the same prominence as the forward calculation because it is the direction physical constraints impose, and because subtracting the water from the total — the intuitive alternative — is circular, the water being itself a function of the unknown flour. The same inversion identity is used by the pizza dough page in this category, and the two return identical flour weights for identical inputs. Salt teaspoon equivalents use 6.0 g for fine table salt, 5.5 g for fine sea salt, 4.8 g for Morton coarse kosher and 2.8 g for Diamond Crystal, the published figures for each product, which differ by a factor of 2.14 across the range and make volumetric salt measurement unreliable.
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Bakers Percentage Calculator — 20 Expert FAQs
20 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
What is baker's percentage?
A formula convention in which flour is always 100% and every other ingredient is expressed as a percentage of the flour weight. Water at 650 g against 1,000 g of flour is 65% hydration. Because every figure refers to the flour rather than to the batch, the same percentages describe a 500 g home loaf and a 200 kg commercial mix, which is what makes bread formulas portable between scales.
Why do baker's percentages add up to more than 100?
Because they are percentages of the flour, not shares of the total. A lean bread at 65% hydration, 2% salt and 1% yeast sums to 168%, and enriched doughs can exceed 200%. If your percentages sum to exactly 100 you have calculated shares of the batch instead, which is a different and much less useful convention that does not survive a change of batch size.
How do I find the flour weight from a total dough weight?
Divide the total by one plus the sum of all the percentages as decimals. For 1,000 g of dough at 65% hydration, 2% salt and 1% yeast the divisor is 1.68, so the flour is 595 g. Do not subtract the water: the water is defined as a percentage of the flour you have not found yet, so the subtraction is circular. This inversion is what you need whenever a tin or a mixer sets the constraint.
What percentage of salt should bread have?
Between 1.8 and 2.2% of flour weight, with 2% as the standard anchor. Below about 1.5% the bread tastes flat and ferments noticeably faster, because salt restrains yeast activity as well as seasoning. Above about 2.5% the yeast is retarded enough to lengthen the proof, and the bread starts to taste salty. It is one of the tightest bands in baking.
Does one teaspoon of salt always weigh the same?
No, and the spread is large enough to ruin a formula. A teaspoon of fine table salt weighs about 6.0 g, Morton coarse kosher about 4.8 g and Diamond Crystal about 2.8 g, because the crystal shapes pack completely differently. That is a factor of 2.14 between the extremes for the same nominal spoon. Salt is the ingredient where volume measurement fails hardest, so weigh it.
Is hydration the same as baker's percentage?
Hydration is one entry in the table — the water percentage specifically. Baker's percentage is the whole framework, covering salt, yeast, fat, sugar and everything else on the same basis. People often use the words interchangeably because hydration is the figure that most visibly changes how a dough handles, but they are not synonyms.
How do I convert a cup recipe into baker's percentages?
Weigh everything first, then divide each weight by the flour weight. You cannot do it from the cup measures directly, because a cup of flour ranges from about 110 g sifted to 160 g scooped depending on how it was filled, and that 45% spread would swamp every percentage you calculated. Converting a volume recipe is really an exercise in weighing it once.
What are typical hydration levels for different breads?
Bagels and pretzels sit at 50 to 57%, sandwich bread and New York pizza at 58 to 63%, everyday hearth bread at 65 to 70%, country sourdough at 70 to 78%, ciabatta at 80% and above, and Roman al taglio can pass 85%. Higher hydration gives a more open crumb and a crisper crust but demands stronger flour and much more skill in shaping.
Can I calculate the formula if I only know one ingredient weight?
Yes, and that is one of the framework's real strengths. Divide that weight by its percentage as a decimal to recover the flour, then rebuild everything else from the flour. Twenty grams of salt at 2% means 1,000 g of flour, and the rest of the formula follows immediately. Any single known pair of weight and percentage is sufficient.
Should the starter or preferment be included in the percentages?
It appears as its own percentage line, but the flour and water inside it also have to be counted in the flour and water totals, or the hydration figure will be wrong. This is the point at which baker's percentage gets genuinely tricky, and it is worth using the dedicated sourdough calculation rather than trying to hold both conventions in your head at once.
Is this bakers percentage calculator free to use?
Yes. It is free, requires no account, and has no usage limits. ApexConverter is funded by contextual advertising, never by selling user data.
Is my data sent to a server?
No. The engine runs as Vanilla JavaScript inside your browser under our Zero-Server Client-Side Execution model. Your figures are computed locally and are never transmitted, logged, or stored.
How accurate is this calculator?
It applies the standard closed-form formula in IEEE-754 double precision, rounding only at the display layer. The engine is reconciled against an independent reference implementation before release.
Does it work on mobile?
Yes. The interface is mobile-first with numeric keypad hints and is tested down to a 320-pixel viewport with no horizontal scrolling.
Can I use it offline?
Largely, yes. Because computation is client-side, the page continues to calculate without a network connection once it has loaded.
Which currency does it use?
Amounts display in US$ accounting format, but the underlying mathematics is currency-agnostic. The result is identical in any currency, so simply read the figures in your own.
Why does a result show an em-dash?
An em-dash indicates the calculation is not defined for the inputs given — typically a division by zero or a value outside the valid domain. We show a dash rather than a misleading number.
How do I report an error?
Email apexconverter.praxiscalc@gmail.com with the tool URL, your exact inputs, the output received and the output you expected. Verified mathematical errors are patched within 72 hours.
Where can I find related bakers percentage calculator tools? (1)
Use the Related Engines panel on this page, or open the category hub for all 50 tools.
Where can I find related bakers percentage calculator tools? (2)
Use the Related Engines panel on this page, or open the category hub for all 50 tools.