Caputo vs King Arthur: Which Pizza Flour Should You Buy?

This comparison is usually framed as a two-bag fight, and that framing is where it goes wrong. Caputo sells two pizza flours that are 40 W apart, and King Arthur sells two whose published protein figures differ by 1.7 points. Pick the wrong sibling from either brand and you will blame the wrong country.

The short answer

Buy Caputo Chef's, the blue bag, if you cold-ferment 24–72 hours. It is a 00 at around 13% protein and W300–320 — enough stamina to sit three days in the fridge and still hold a dome. That long ferment is also the reason it is the Caputo bag that behaves best in a domestic oven: an unmalted flour has to earn its surface sugar through time.

Buy King Arthur Bread Flour if you bake New York, Detroit or pan at home. King Arthur publishes 12.7% protein and publishes a tighter protein tolerance than supermarket brands, and the flour is enzyme-active — the label reads "Enzyme* or Malted Barley Flour" — so it browns at 250 °C (480 °F) where an unmalted 00 stays blond.

Do not buy King Arthur '00' Pizza Flour expecting Caputo's strength. King Arthur publishes 11.0% protein for it. It is a genuinely fine 00 grind and a lovely, forgiving, tender dough — and it is the weakest bag in this comparison, with nothing in reserve past about 24 hours.

Four bags, not two

Here is what each mill actually publishes, which is a shorter list than the internet assumes.

| Flour | Protein | W | Ferment window | Malt or enzyme | | --- | --- | --- | --- | --- | | Caputo Chef's (blue) | ~13% | W300–320 | 24–72 h | No | | Caputo Pizzeria (red) | ~12.5% | W260–280 | 8–24 h | No | | King Arthur Bread Flour | 12.7% | not published | 24–48 h, 72 h with care | Yes | | King Arthur '00' Pizza Flour | 11.0% | not published | up to ~24 h | No |

The absent W values are not evasion. The alveograph is a European instrument, and US mills specify on protein and falling number instead. Central Milling is the rare American exception, publishing W280–300 at 11.5% protein — which is also the neatest proof that protein alone is a poor predictor of stamina.

Protein and W: strength and staying power

Protein tells you how much glutenin and gliadin the flour brings to the mix. W, measured by inflating a disc of dough until it bursts, tells you how much work that network absorbs before it gives up. Protein is strength; W is stamina, and stamina is the thing a long ferment spends.

Caputo Chef's at W300–320 and Caputo Pizzeria at W260–280 are the clean illustration. Both are 00. Both come from the same mill. Ask the red bag for 72 hours and the dough's own proteases — woken up by fermentation acidity — will have cut the gluten into short pieces long before you get there, and the ball spreads flat in its tub. Ask the blue bag for the same three days and it holds.

King Arthur publishes no W for either flour, so its ceiling is read from the dough rather than a number. Read that way — slack in the tub, a rim that has stopped holding its shape — the Bread Flour's comfortable limit lands at 48 hours, with 72 workable if you drop to 0.1% instant yeast and keep the fridge at 4 °C (39 °F). The '00' Pizza Flour, at 11.0%, is an overnight flour and should be planned as one.

For the wider map of protein, W and grind, the flour pillar lays the whole shelf out in one place.

Malt is the difference your oven notices

This is the mechanism the brand argument almost always skips, and at home it matters more than protein does.

Browning is a temperature threshold with a fuel requirement: the dough surface has to climb past roughly 150 °C (300 °F) with reducing sugars present. Italian mills do not add amylase. North American mills routinely do — as malted barley flour or as an isolated enzyme — and that added amylase keeps converting starch to sugar right up to the moment the crust sets.

So King Arthur Bread Flour arrives at the oven with fuel already in the tank. Caputo has to make its own, which it does slowly, through fermentation. That is why a 72-hour Chef's dough browns visibly better than the same flour mixed that morning, and why a same-day Caputo pizza in a 250 °C (480 °F) oven comes out pale and floppy with no leopard spots on the rim. The flour is not failing. It was formulated for 60–90 seconds at 430–480 °C (800–900 °F), where nothing needs adding.

King Arthur's '00' Pizza Flour sits awkwardly here: a 00 grind with no malt on the label, so it inherits the browning problem without inheriting Caputo's strength to ferment its way out of it.

Hydration and handling

The received wisdom is that Caputo absorbs more water than King Arthur. That is true of one King Arthur bag and false of the other, which is why the advice keeps misfiring.

Caputo Chef's is comfortable at 60–70%. Start at 62–63% for a home oven, where a slightly drier surface reaches browning temperature sooner, and push towards 68% only above 400 °C (750 °F). The dough stays extensible and slaps out easily even after three days cold — soft, pliable, almost silky.

King Arthur Bread Flour is coarser than any 00 and carries more damaged starch, so at the same stated protein it binds noticeably more water: expect to run 3–5 percentage points higher to get the same feel in the hand. It also snaps back hard out of the mixer. Rest it properly or the rim will fight you.

King Arthur '00' Pizza Flour is the softest of the three to open, with almost no snap-back, and it takes the least water — 58–65% is its range. Coming from Caputo Chef's, drop two points.

Set the ratios on the dough calculator rather than guessing, and change one variable at a time.

Performance by style and oven

Neapolitan above 400 °C (750 °F). Caputo, and specifically the red Pizzeria bag if you mix in the morning and bake that night — that is the schedule it was built for, and the blistering at 430–480 °C is the whole point of the style. Chef's if your schedule runs longer. Put either into a classic margherita.

Neapolitan in a home oven at 250–290 °C (480–555 °F). Caputo Chef's, fermented 48–72 hours, on a fully preheated baking steel, finished 60–90 seconds under the grill. Steel conducts at roughly 45 W/m·K against cordierite's 2.5 — about 18 times faster — and at these temperatures that head start is most of the battle.

New York. King Arthur Bread Flour, without much argument. The 12.7% protein gives a slice that folds instead of cracking, and the added amylase colours the base in the six to eight minutes a domestic oven needs. See the New York cheese slice.

Detroit and pan. King Arthur Bread Flour again. The crumb has to stand up under cheese pressed to the edge, and a soft 00 will not do it.

Sourdough. A mature levain is more acidic, and acidity speeds the proteases up. Step up a strength band: Caputo Chef's over Pizzeria, Bread Flour over the '00'.

Price and availability

Caputo Chef's costs noticeably more per kilogram than a supermarket bread flour, and it is genuinely hard to find in a standard US supermarket at all — an Italian grocer is usually cheaper than a marketplace listing if you have one nearby. King Arthur Bread Flour sits on the shelf of most US supermarkets for a fraction of that per kilogram, and the '00' Pizza Flour increasingly sits beside it. Current prices for both are on the review pages. Gold Medal Bread Flour at around 12.3% protein is the cheaper enzyme-active alternative and, on a 24-hour New York dough, one most people could not pick out of a line-up.

The verdict

Buy Caputo Chef's if you cold-ferment for days, chase Neapolitan texture, and have either real heat or the patience to substitute time for it. Buy King Arthur Bread Flour if you bake in a domestic oven and want a browned, chewy crust without planning your week around it. Buy King Arthur '00' Pizza Flour only if you specifically want a tender 00 crumb on an overnight dough and you have read its 11.0% and planned around it.

And if the question underneath all this is really 00 against bread flour rather than Italy against Vermont, that is its own comparison.