Silken, firm, extra-firm and super-firm

What the firmness label actually measures

Tofu is made by curdling soy milk with a coagulant and pressing the curds into a block. Firmness is almost entirely a measure of how hard and how long that pressing went on. A firmer block is not a different recipe. It is the same curd with more water removed.

That single fact explains most of the practical differences. Firmer tofu has more protein per hundred grams because there is less water diluting it. It holds its shape under heat because there is more structure per unit of volume. It browns faster because there is less moisture to drive off first.

Silken tofu is the exception to the pressing rule. It is coagulated in its final package and never pressed at all, which is why it is smooth rather than slightly grainy, and why it falls apart if you treat it like the others.

Those six words describe an American refrigerator case rather than tofu itself. Japanese tofu divides more fundamentally into momen, cotton tofu, and kinugoshi, silken tofu, and what a US package calls extra-firm is a cotton tofu. Beyond the water pack sit yuba, aburaage, atsuage, koyadofu, doufu gan and fermented bean curd, none of which appear on this page and all of which are covered on the varieties page.

Tofu originated in China and spread across East and Southeast Asia over centuries, which is why the naming conventions on a supermarket shelf are a mix of translated terms and marketing. Japanese-style silken and Chinese-style firm blocks sit next to each other under labels that do not always agree.

The five types

If you are standing in an American supermarket and want to cook something from this site, buy extra-firm. It is the most forgiving block for crisping, which is what ten of the twelve recipes here are built around. That is a statement about this site rather than about tofu. Extra-firm is a poor choice for soups, braises, sauces and desserts, and it is not what most tofu dishes worldwide are made with.

Silken tofu is not a failed version of firm tofu

This is worth stating plainly, because the framing on most Western cooking sites treats silken as the one to avoid. It is a genuinely excellent ingredient that happens to be useless for the specific job of crisping.

Blended, it makes a creamy base for sauces, dressings and desserts with no dairy involved. In hot broth it turns delicate and custardy. In mapo tofu, a Sichuan dish, the softness is the entire point and a firm block would ruin it.

What it will never do is brown. Pressing it destroys it, freezing it curdles it, and putting it in a hot pan turns it into scrambled fragments. If you tried tofu once, hated the texture, and cannot remember what you bought, there is a reasonable chance it was silken used in a firm tofu recipe.

Super-firm and the vacuum pack

Super-firm tofu is usually sold in a vacuum-sealed pack rather than sitting in a water bath. It has already been pressed at the factory, so you can open it, pat it dry, cut it and cook it immediately. For a weeknight that is a genuine advantage, and it is the one legitimate way to skip the pressing step entirely.

What you give up is some of the creaminess in the middle. Super-firm stays dense all the way through and reads as chewy rather than tender. Some people prefer that. Others find it monotonous. It is also usually more expensive per gram of tofu, though you are partly paying for the water someone else already removed.

It takes marinade poorly, for the same reason any dense block does. Freezing it first solves that, and the freezing guide covers how.

Reading the package

Ingredient lists are short: soybeans, water, and a coagulant. The coagulant is worth a glance because it changes the mineral content. Calcium sulfate contributes a meaningful amount of calcium. Magnesium chloride, often labeled nigari, contributes almost none and gives a slightly sweeter, more delicate result. Two packages with near-identical labels can differ several-fold on calcium for this reason alone, which is covered on the nutrition page.

Firmness labels are not standardised between brands. One producer's firm can be another's extra-firm. If a block you liked came from a particular brand, note the brand rather than only the firmness word.

Weight varies too. Blocks run from twelve to sixteen ounces, and a recipe written for sixteen will be under-seasoned if you use twelve without adjusting.

Matching type to dish

Crisp cubes and browned edges: extra-firm, pressed. This is the default for the whole techniques section.

Chewy, meaty, sauce-soaked: extra-firm or super-firm, frozen and thawed. Barbecue and stews benefit most.

Scrambles and crumbles: firm or medium. Some moisture is welcome here, and a block that is too dry produces something dusty rather than soft.

Soups and braises: soft or silken, added late and handled gently. Crisping first is wasted effort, as the crisping guide explains.

Sauces and desserts: silken, blended. No pressing, no freezing, no heat beyond gentle warming.

What to do next

Buy extra-firm, press it, and cook a batch of basic crispy tofu with nothing on it but salt. That establishes what your particular brand and firmness behave like, which is more useful than any label.

If a previous attempt went badly and you now suspect the block was the problem, the diagnostic list covers the other ten possibilities.