Understanding Pasta Dough Hydration (and Why It Changes by Shape)

If you've followed a few different pasta dough recipes on this site, you may have noticed the ratios aren't all the same — and that's not an inconsistency, it's intentional. The amount of liquid in your dough (its "hydration") changes depending on what you're making, and getting it right is one of the biggest factors in whether a shape turns out the way it should. Here's what hydration actually means, and how it shifts across the different types of pasta we cover.

What hydration means

Hydration is simply the weight of your liquid (water, egg, or both) expressed as a percentage of the weight of your flour. If a recipe uses 300g of semolina and 165g of water, that's 165 ÷ 300 = 55% hydration.

It's a more useful way to think about dough than "cups" or "a splash," because it scales predictably — once you know the right percentage for a shape, you can make any batch size and get a consistent result.

Why it matters

Hydration determines texture, workability, and how the dough behaves under different tools. Too little liquid and a dough won't hold together; too much and it becomes sticky, loses structure, and can even damage certain tools (more on that below). The right hydration level isn't one fixed number — it depends entirely on what you're about to do with the dough.

Hydration by pasta type

Extruded pasta: ~40%

This is the lowest hydration you'll use, and it looks nothing like a typical dough — more like wet sand than a smooth ball. At around 40g of water per 100g of semolina, the mixture stays crumbly and won't hold together on its own. That's intentional: you crumble it, press small handfuls into walnut-sized balls, and feed those into the extruder. Too much hydration here risks clogging the extruder's mechanism, so it's worth resisting the urge to add extra water even if the dough looks too dry at first.

Hand-shaped and filled pasta: ~50–55%

This is the range for shapes made on a gnocchi board (cavatelli, capunti, rigatoni, caserecce), as well as filled pasta like ravioli. At this hydration, the dough is smooth, elastic, and holds together well enough to be rolled, cut, and shaped by hand or tool without tearing. Our base semolina dough recipe (300g semolina, 165g water) sits right in this range.

Egg pasta dough: ~55%

Egg dough is calculated the same way, just with egg replacing some or all of the water. Our standard recipe (450g combined flour, 250g egg) works out to roughly 55% — similar to hand-shaped semolina dough, but the fat and protein in the egg give a softer, more tender bite, which is why egg dough is the better choice for delicate shapes like tagliatelle or mezzelune.

Chitarra: same range, thicker sheet

Chitarra spaghetti doesn't need a different hydration level from standard egg or semolina dough — the distinguishing factor here is thickness, not liquid ratio. You'll sheet the dough thicker than usual (about 2mm) so it matches the spacing of the chitarra's strings and produces that signature chunky, square-cut strand.

A few things that shift the numbers slightly

• Flour type: semolina and 00 flour absorb liquid differently, so switching flours in a recipe may mean the dough feels slightly wetter or drier even at the "same" hydration percentage.

• Humidity: on a humid day, dough can feel wetter than the recipe suggests even with exact measurements — this is normal, and a light dusting of flour while kneading is the usual fix.

• Egg size: egg weight varies more than you'd expect. Always weigh your eggs rather than counting them, especially for recipes where hydration is closer to a technical requirement (like extrusion).

When to adjust

If your dough feels too dry or too wet, resist adjusting immediately — knead for at least 5 minutes first. A lot of what feels like "wrong hydration" in the first few minutes is actually just the flour still absorbing liquid. If it's still off after that, add water in small spritzes or dust with flour a little at a time, checking as you go rather than making a big correction all at once.

Shop Pasta Tools →

Want to practice this hands-on? Join our Filled Pasta Workshop →