How this calculator
actually works.

We built this calculator because we could not stop asking questions about dough. Not just how to make it, but why it does what it does. Why does the same recipe feel different on a cold morning? Why does one flour drink water and another refuse it? Why does a 24-hour cold ferment taste different from an 8-hour warm one when the dough looks the same?

We are not food scientists. We are designers and educators who love pizza and believe that understanding the principles behind a craft makes you better at it. Everything on this page represents our best current understanding of dough science, drawn from published research, professional baking literature, and the generous knowledge-sharing of the pizza-making community.

Some of what follows is well-established science. Some of it is approximation, and we have tried to be clear about which is which. We expect there are errors here. We expect there are places where our simplifications have introduced inaccuracies we have not caught yet. That is the nature of learning in public: you show your work, and you trust that the people reading it will tell you what you got wrong. If you find something that does not match your experience, a claim that contradicts what you know, or an assumption that falls apart in your kitchen, we want to hear about it. Correction is not criticism. It is how this tool gets better.

This calculator gives you a starting point. Your hands, your oven, and your flour will teach you the rest.

Pick up two different flours and run them between your fingers. A fine Italian 00 feels like silk. A coarse whole wheat feels like sand with a secret. Now add the same amount of water to each. One gives you a smooth, pliable dough. The other gives you a shaggy mess that sticks to everything. The flour changed. The water has to change with it.

Every pizza style assumes a specific type of flour. Neapolitan recipes are built around Italian 00, and the AVPN disciplinare specifies an absorption range of 55 to 62% for suitable flour (AVPN, Disciplinare). We use 59% as a modelling midpoint. New York recipes expect North American bread flour, which typically absorbs more water due to higher protein and starch damage. These are not universal properties of the styles; they are reference points that let the calculator do its job.

When you select a different flour, the calculator applies an absorption ratio:

Take New York style as an example. Its base hydration is 62%, designed for bread flour (absorption ~64%). Switch to Robin Hood All Purpose (absorption ~58%), and the calculator scales water down to 56.2%. Switch to a whole wheat (absorption ~75%), and it climbs to 72.7%. Same style, very different water needs, all driven by the flour you chose.

Farinograph absorption (the number behind these calculations) is not a stylistic preference. It is an instrument-defined measurement: the percentage of water, based on flour weight at 14% moisture, needed to reach a standard dough consistency on a farinograph (AACC Method 54-21.02). It captures protein, starch damage, particle size, and fibre content in a single number. Scaling hydration by absorption ratios is a useful first-order adjustment, but it cannot guarantee identical handling across flours, mixing intensities, or fermentation regimes. It gets you close. Your hands get you the rest of the way.

The calculator will not suggest a hydration outside the flour's tested range, where that data is available. Think of it as a guardrail to keep your dough in a workable zone.

Three things make a flour thirsty for water, and they do not all work the same way.

Protein is the biggest driver. Gluten-forming proteins absorb roughly twice their own weight in water, so higher-protein flours generally need more water. Published estimates for the protein-to-absorption relationship range from roughly 1 to 2 percentage points of absorption per 1% increase in protein, depending on starch damage, milling method, and how absorption is measured (Skeggs, 1985; Sedlacek et al., 2023). It is a useful rule of thumb, not a fixed constant.

Damaged starch is the second factor. When wheat is milled aggressively, some starch granules crack open. Damaged starch absorbs far more water than intact starch. This is one reason North American bread flour can drink more water than Italian 00, even when protein levels are similar: harder milling damages more starch.

The third is fibre. Whole wheat and high-extraction flours contain bran and arabinoxylans (a type of fibre that holds several times its own weight in water). These compete with the gluten network for available water, which is why whole wheat flour demands significantly more hydration than white flour made from the same wheat (Sedlacek et al., 2023). The extra water is going to the bran, not to gluten development.

"Roughly" and "approximately" appear throughout this section on purpose. These are patterns drawn from food science literature, not precise constants. They vary with wheat variety, milling method, and measurement conditions.

Yeast does not read a clock. It reads a thermometer.

The Q10 temperature coefficient is a standard concept from biology: it describes how much a reaction rate changes when temperature increases by 10 degrees Celsius. For most biological systems, Q10 falls between 2 and 3 (Hegarty, 1973; Mundim et al., 2020). We use Q10 = 2.0, the most conservative choice in the published range. In practical terms, this means yeast activity roughly doubles for every 10-degree increase. If your dough ferments at 30 degrees, the yeast is working about twice as fast as at 20 degrees, so you need roughly half the yeast.

This is a calibrated approximation, not a law of nature. Real yeast does not obey a single constant across all temperatures, and fermentation involves a cascade of biological and chemical events that shift with strain, flour, salt, and time.

Two temperature regimes. A single Q10 does not hold across the full range from fridge to room temperature. In the fridge (~4 degrees), yeast metabolism and reproduction slow dramatically but do not stop. Over multi-day cold storage, dough still produces measurable carbon dioxide and alcohol (Kyogoku et al., 1995). The kinetics differ from room-temperature fermentation: growth is minimal, but slow sugar consumption continues. To account for this, the calculator uses separate parameters for cold fermentation (below 8 degrees) and warm fermentation (above 15 degrees), with a blended transition between them.

Time and yeast. At a fixed temperature, the relationship between fermentation time and the amount of yeast needed is not a simple trade-off. At warm temperatures, yeast reproduces and compounds its own activity, so longer times need disproportionately less yeast. At cold temperatures, reproduction is minimal, so the relationship is closer to a straightforward inverse. Both of these are modelled as power-law curves with different exponents, not as universal biology.

Multi-stage fermentation. When your plan includes stages at different temperatures (say, two hours on the counter followed by 24 hours in the fridge), the calculator tracks progress through each stage in sequence rather than averaging the temperatures. This is more physically accurate.

Accuracy. When tested against empirical fermentation data, the model has a mean error of roughly 14%, with about three-quarters of predictions falling within 25% of actual results. This figure is based on internal validation against test batches across a range of flours and fermentation schedules; it has not been independently replicated. The cold zone (4 degrees) is well-modelled. The warm zone is reasonable but less precise, especially at combinations of long time and high temperature. Biological fermentation varies even under controlled conditions. Yeast brand, freshness, flour enzyme activity, salt percentage, and ambient humidity all play a role (BAKERpedia, "Fermentation"). The calculator gives you a calibrated starting point. Your first bake with any new combination should be treated as a test run.

What this model is not. It is not the TXCraig1 model, the PizzaBlab model, or any other named model. We built it on the Q10 principle so that every constant can be explained and every claim can be checked. We acknowledge the pizza-making community, especially contributors on PizzaMaking.com and PizzaBlab, for the extensive empirical work that informed our understanding.

Mix a batch of dough in a food processor and touch it when it comes out. It is warm. Mix the same recipe by hand and the dough is barely above room temperature. That difference matters more than most home bakers realize. The temperature of your dough after mixing sets the pace for everything that follows: how fast the yeast works, how the gluten develops, and what the crust tastes like when it comes out of the oven.

Professional bakers call this the desired dough temperature (DDT), and they control it by adjusting the one variable they can easily change: water temperature.

The formula for direct doughs (no preferment) is:

The multiplier 3 represents the three temperature variables other than water. For doughs that include a preferment (poolish, biga, levain), the formula expands to four factors and the multiplier becomes 4, with the preferment temperature added as a fourth subtracted term.

The friction factor is the estimated heat, in degrees Celsius, that mechanical mixing adds to the dough. Every mixer type generates a different amount depending on its speed, geometry, and how long it runs. The values below are compiled from Jeffrey Hamelman's Bread, King Arthur Baking's published testing, Andrew Janjigian's Wordloaf research, SFBI documentation, Italian pizza industry sources, and community measurement data.

These are starting points. The actual friction your mixer produces depends on mixing time and speed, dough hydration (wetter doughs generate less friction), batch size relative to mixer capacity, flour protein content, and whether your bowl is cold stainless steel or room-temperature plastic. We recommend mixing a test batch, measuring the actual dough temperature after mixing, and back-calculating your personal friction factor. Two or three test bakes will give you a number you can rely on.

Standard DDT targets for pizza range from 24 to 26 degrees Celsius for room-temperature fermentation and 18 to 21 degrees for doughs heading into cold fermentation. The calculator uses 24 degrees as its default.

Leave a dough out too long and you know what happens. It goes slack. It tears when you stretch it. The cornicione that should puff up in the oven instead spreads flat. What happened is not a mystery: enzymes in the flour slowly broke down the gluten network, and the dough ran out of structural integrity before you got to the oven.

W value, measured by a Chopin Alveograph, tells you how much energy it takes to inflate a thin disc of dough until it bursts. Higher W means a stronger, more resilient dough that can tolerate longer fermentation, higher hydration, and more handling before it gives out (AHDB, Alveograph Guide). It is not a direct measurement of how many hours your dough will last. It is a proxy for structural resilience, and experience has shown it correlates well enough to be useful.

The following table provides guidelines, not laboratory thresholds. Different bakers define "failure" differently (over-softening, tearing, loss of gas retention, excessive acidity), and the actual ceiling for a specific flour depends on hydration, salt, temperature, and technique.

Cold fermentation extends these limits because both yeast activity and flour enzyme activity are slowed by lower temperatures. The degree of slowing differs between yeast and proteases, but the direction is consistent: colder storage shifts the balance in ways that generally increase the usable fermentation window (Mundim et al., 2020).

P measures tenacity: how hard the dough pushes back. L measures extensibility: how far it stretches before it tears. The ratio between them tells you whether a flour tends toward tight and springy (high P/L) or relaxed and stretchy (low P/L).

For pizza, the AVPN specifies a P/L of 0.50 to 0.70 for 00 flour, with an ideal around 0.60, and a slightly different range of 0.55 to 0.70 for Type 0 flour (AVPN, Disciplinare). These ranges describe flour suited to long leavening and hand stretching. A P/L above 0.70 tends to fight you when you open the dough ball. A P/L below 0.50 can produce dough that stretches beautifully but lacks the tension to hold its shape.

When a flour in our database has published P/L data, we display it. Many flours do not publish P/L values, in which case we do not guess.

You followed the recipe. The dough looked perfect. You baked it at 250 degrees in your home oven and pulled out a pizza that tastes right but looks anaemic. The crust is pale, almost blonde, with none of the golden-brown colour you expected. What went wrong is probably not your technique. It is your flour's enzyme activity.

Browning happens through the Maillard reaction: reducing sugars react with amino acids at high surface temperatures to produce hundreds of flavour and colour compounds. The sugars have to come from somewhere. In dough, most of them are produced by alpha-amylase, an enzyme that breaks down starch into fermentable sugars during mixing and fermentation. Flour with high alpha-amylase activity generates a large pool of these sugars. Flour with low alpha-amylase activity does not.

Many Italian pizza flours, particularly those formulated for high-temperature bakes, have low alpha-amylase activity and correspondingly high Falling Number values (a test that measures enzyme activity; high number means low activity). The Caputo Pizzeria spec sheet, for example, lists a Falling Number of 340 to 360 (Molino Caputo, technical data). This is by design. At AVPN-specified oven temperatures, the combination of overhead heat reflecting off the dome and direct contact with the oven floor browns and blisters the crust in 60 to 90 seconds (AVPN, Disciplinare). Low enzyme activity actually helps prevent excessive browning in that environment.

In a home oven at 250 degrees, the math changes. The bake takes 8 to 12 minutes instead of 90 seconds. The surface temperature never reaches the extremes of a wood-fired dome. And if your flour started with low enzyme activity, there may not be enough reducing sugars to drive meaningful Maillard browning in that time.

Most North American all-purpose and bread flours are formulated to address this. In the United States, malted barley flour is commonly added (General Mills, Gold Medal AP ingredient list). In Canada, amylase is more commonly listed as an added ingredient (Robin Hood AP ingredient list; Health Canada, permitted enzymes). The functional effect is similar: both increase the pool of reducing sugars available for fermentation and crust colour.

If you are using a low-enzyme Italian flour in a home oven, you have two options. Adding diastatic malt powder restores the enzyme activity the flour lacks: start at 0.1 to 0.2% of flour weight and adjust from there, because too much produces a gummy, dense texture (Hamelman, Bread, 3rd ed.; King Arthur Baking, "Using Diastatic Malt"). A small amount of sugar (0.5 to 1% of flour weight) can also improve browning, though it changes fermentation dynamics and may brown the surface faster than the interior sets.

The calculator flags this mismatch when you pair a low-enzyme flour with a low-temperature oven. If you find a combination we miss, let us know.

Things we approximate: Absorption rates for flours without published spec sheets. Fermentation ceiling times based on W value. The crossover zone (8 to 15 degrees) between our cold and warm yeast models. The 0.25 cold-rate factor used in multi-stage calculations. Friction factors for mixers we have not personally tested.

Things we do not model: The effect of sugar on yeast activity. The effect of salt on yeast activity beyond what is baked into the base curves. Dough hydration's effect on fermentation rate. Altitude. Humidity. The difference between balling immediately and bulk fermenting first.

Things that vary batch to batch: Flour protein and moisture content shift with the season and the harvest. Yeast viability varies between brands and between packets. Your kitchen temperature is rarely constant over a 24-hour ferment. Your fridge may be 3 degrees or 6 degrees, and that difference compounds over a long cold proof.

What this means: This calculator is a starting point built on the best principles we can find and explain. It is not a replacement for watching your dough. If the calculator says 0.15% yeast and your dough is over-proofed at 20 hours, use less next time. If it says 65% hydration and your dough is too stiff, add water. The calculator learns nothing from your bakes. You do.