Pan Pizza Dough Hydration: Ratios That Actually Add Up

Hydration is division, not a personality test

Pan-pizza dough hydration is the water weight divided by the flour weight, multiplied by 100. If a formula contains 300 grams flour and 210 grams water, the calculation is 210 ÷ 300 × 100 = 70%. That is a 70% hydration dough.

The percentage tells you how much water the formula carries relative to flour. It does not promise an airy crumb, identify the best flour, or reveal whether somebody actually proofed the dough. It is a useful number, not a tiny edible horoscope.

For consistent pan pizza, weigh flour and water in grams, keep oil as its own baker’s percentage, and scale the full formula by pan area. Then use feel, fermentation, and the baked crust to decide whether the number suits your flour and oven.

Baker's percentages put flour at 100%

In baker’s math, the total flour is always 100%. Every other dough ingredient is expressed as a percentage of that flour weight.

Here is the formula behind our 10-inch cast-iron pan pizza:

Add the ingredient weights and the total dough is 526 grams. The percentages add to 175.33%, which is perfectly normal: that total compares all ingredients with flour; it is not the percentage composition of the finished dough.

Pan oil, sauce, cheese, and toppings stay outside the dough formula. If you add 18 grams oil to the skillet, it affects frying and flavour but does not transform the dough into 76% hydration.

Why grams beat cups here

Hydration is a weight ratio. Water is convenient because one millilitre weighs approximately one gram for ordinary kitchen use, but flour volume is fickle. A cup changes weight depending on how it was scooped, aerated, settled, or levelled.

Suppose one cook measures 2 1/2 cups of flour at 120 grams per cup, while another packs the same volume at 145 grams per cup. The first has 300 grams flour and, with 210 grams water, makes 70% hydration dough. The second has 362.5 grams flour, so the same water makes about 58% hydration dough. The cup count matches; the dough does not.

Use a digital scale that reads whole grams for flour and water. For tiny yeast quantities, a scale that reads tenths of a gram is better. Put the bowl on the scale, tare to zero, and add each ingredient deliberately. If you overshoot the water by 10 grams, do not pretend the scale blinked.

What changing hydration actually changes

At the same flour weight, increasing hydration adds water and total dough mass. With 300 grams flour:

More water generally makes dough softer and more extensible. With suitable flour, fermentation, folding, proofing, and heat, it can support a more open crumb. It also makes shaping messier, slows browning if the bake is weak, and can leave a gummy centre when the dough is overloaded.

Lower hydration is easier to handle and can brown readily, but pushed too low it may resist stretching and bake dense or dry. Neither direction is morally superior. The useful question is whether the dough reaches the pan without tearing, traps fermentation gas, and bakes through before its toppings scorch.

Flour changes the feel at the same percentage

Two flours at 70% hydration can feel different. Protein quantity and quality, wheat variety, milling, age, and storage all affect absorption and strength. Whole-grain flour also brings bran and germ, which alter water demand and gluten development.

That is why a percentage should travel with a method and an observation. Our 70% cast-iron dough is tacky but foldable after a rest. The 73% dough in the half-sheet pan recipe is wetter, yet its larger batch and staged pressing remain manageable with oiled fingertips.

When trying an unfamiliar flour, hold back 3–5% of the water weight—about 6–10 grams from a 210-gram amount. Mix, rest for 20 minutes, then add the reserved water gradually if the dough can accept it. Record what you actually used. Do not correct wetness by dusting in flour indefinitely; every handful changes hydration, salt percentage, yeast percentage, and total dough mass.

Oil is not hydration

Oil tenderises, lubricates, carries flavour, and assists browning in a pan, but standard hydration calculations count water, not oil. In the cast-iron formula, 9 grams oil divided by 300 grams flour is 3% oil. Hydration remains 70%.

Ingredients such as milk, eggs, honey, mashed vegetables, and sourdough starter contain some water and some solids. Advanced formula comparison can account for their water contribution. For a simple flour-water-salt-yeast-oil dough, keeping water and oil separate is both conventional and clear.

A starter requires particular care. A 100% hydration starter contains equal flour and water by weight. If a recipe adds 100 grams of that starter, it adds 50 grams flour and 50 grams water. Both belong in the final hydration calculation. Ignoring the starter’s flour makes the percentage wrong while still looking impressively mathematical.

Scale thickness with dough mass per area

Hydration controls a ratio; it does not decide how thick the pizza is. Thickness begins with dough mass divided by usable pan area.

For a rectangle:

area = interior length × interior width

For a circle:

area = π × radius²

Our 10-inch skillet has a nominal radius of 5 inches, so its area is π × 5² = 78.54 square inches. Its 526-gram dough gives 526 ÷ 78.54 = 6.70 grams per square inch.

The half-sheet formula uses 1,070 grams dough over a nominal 13 × 18 = 234 square inches. That is 1,070 ÷ 234 = 4.57 grams per square inch. It is deliberately thinner per unit area than the cast-iron version.

Measure the flat interior rather than trusting the number on a label. Sloped sides, rounded corners, and generous rims reduce usable area. Precision to two decimal places is charming, but only if the measurement beneath it is real.

Example: scale a 10-inch recipe to 12 inches

A 12-inch round pan has a 6-inch radius. Its area is π × 6² = 113.10 square inches. Divide by the 10-inch pan’s 78.54 square inches:

113.10 ÷ 78.54 = 1.44

Multiply every dough ingredient by 1.44:

The scaled dough weighs 757.44 grams. Divide by 113.10 square inches and it remains about 6.70 grams per square inch. Its hydration also remains 302.4 ÷ 432 × 100 = 70%.

For practical weighing, 302 grams water, 8.6 grams salt, 1.4 grams yeast, and 13 grams oil are sensible rounded amounts. Keep the flour at 432 grams. Round consciously and write it down; mystery rounding is how a repeatable recipe slowly becomes folklore.

Compare formulas without confusing batch size

A 600-gram-flour dough at 70% hydration contains 420 grams water. A 300-gram-flour dough at 73% contains 219 grams water. The first contains more water in absolute terms, but the second has the higher hydration.

Always divide water by flour before comparing. Batch weight tells you how much dough exists. Hydration tells you the water-to-flour ratio. Dough density tells you how much batch sits on each unit of pan. Those three numbers answer different questions.

Salt and yeast should also be compared as percentages. Six grams of salt in a 300-gram flour batch and 12 grams in a 600-gram flour batch are both 2%. The flavor balance stays constant while the batch doubles.

Diagnose the bake before changing the ratio

If the crumb is gummy, hydration may be too ambitious for the flour or oven. But first check proofing, topping moisture, sauce load, oven preheating, rack position, and whether the base browned. Our guide to fixing soggy pan pizza walks through those variables in order.

If the dough tears while pressing, it may need more rest rather than more water. If it snaps back, it may be cold, under-rested, or under-fermented. If it spreads like batter after a long ferment, the flour may lack strength or the dough may be over-fermented. One symptom can have several causes, which is inconvenient but less inconvenient than changing three ingredients at once.

Adjust hydration in 2–3 percentage-point steps. On 300 grams flour, a 2-point change is only 6 grams water. Keep the flour, salt, yeast, oil, fermentation, dough density, and bake as stable as possible, then compare. Notes are not glamorous, but neither is repeating the same disappointing pizza because nobody wrote down whether “a splash” meant 8 grams or 40.

The right hydration is not the highest number your social feed can bench-press. It is the one that gives your flour enough water, your hands enough control, and your oven enough time to turn the centre into bread before the edge becomes archaeology.