The Home Cook's Guide to Salt: Types, Weights, and Substitutions

Why 'a teaspoon of salt' isn't a fixed amount

Of every ingredient conversion mistake covered on this site, salt is arguably the one with the widest real-world consequences relative to how small the mistake looks on paper. Swap one salt for another at an equal volume without adjusting, and a dish can end up bland or nearly inedible — not because of a recipe flaw, but because different salts pack dramatically different amounts of actual sodium chloride into the same measuring spoon.

This isn't a minor technicality. Table salt weighs about 288 grams per cup. Diamond Crystal kosher salt, a favorite among professional chefs, weighs just 128 grams per cup — less than half. Morton kosher salt sits in between at 241 grams per cup. Three different products, all labeled "salt," all measuring wildly differently by volume, purely because of how their individual crystals are shaped and how densely they pack together.

Why crystal shape, not saltiness, is the real variable

Sodium chloride itself doesn't vary — salt is salt, chemically. What varies is the physical shape and size of the crystals a given product is manufactured into, and that shape determines how much air gets trapped between crystals when you scoop a spoonful. Table salt is manufactured into small, dense, uniform cubic crystals that pack tightly with little wasted space, which is exactly why it's the heaviest of the three per cup.

Diamond Crystal kosher salt, by contrast, is produced through a process that creates large, irregular, hollow flakes — genuinely lighter and airier crystals that leave far more empty space between them in a measuring cup or spoon. Morton kosher salt uses a different production method that yields a denser, more compact crystal than Diamond Crystal's, landing Morton's weight-per-volume roughly in the middle between Diamond Crystal and table salt.

This is why professional recipes that specify "kosher salt" without naming a brand are creating real ambiguity — a recipe developed and tested with Diamond Crystal, if followed with Morton at the same volume measurement, delivers meaningfully more sodium than the recipe's author intended, since Morton is nearly twice as dense by volume.

The conversion ratios that actually matter

Converting table salt to Diamond Crystal kosher salt roughly doubles the volume needed — use about 2 teaspoons of Diamond Crystal for every 1 teaspoon of table salt the recipe specifies, since Diamond Crystal's lighter crystals mean the same volume delivers much less actual salt. Reversing that conversion (Diamond Crystal to table salt) means using roughly half the volume.

Converting table salt to Morton kosher salt needs a more modest adjustment — roughly 1.25 times the volume of Morton for the same saltiness as a given amount of table salt, reflecting Morton's position between Diamond Crystal and table salt on the density spectrum. These are volume ratios specifically; by WEIGHT, all three salts are close enough to interchangeable, since a gram of sodium chloride delivers the same saltiness regardless of what shape the crystal happens to be cut into.

This weight-versus-volume distinction is the single most useful thing to internalize about salt conversion broadly: if a recipe or a conversion figure gives you a weight in grams, any of these salts works interchangeably at that weight. It's only volume measurements — teaspoons, tablespoons, cups — where crystal shape creates a real, meaningful difference worth adjusting for.

Sea salt and flaky finishing salt: a different category entirely

Sea salt varies considerably more than table or kosher salt, since it's harvested through evaporation rather than mined and refined, and different producers' processes yield genuinely different crystal sizes — from a fine sea salt close to table salt's density to a coarser, flakier variety closer to kosher salt's. There's no single standard "sea salt" weight the way there's a defined figure for table salt, which is exactly why a recipe calling for sea salt without more specificity is inherently a bit less precise than one calling for a named kosher salt brand.

Flaky finishing salts (Maldon being the best-known example) are a genuinely different category in both crystal structure and intended use — large, thin, pyramid-shaped flakes designed to be sprinkled visibly on a finished dish for a textural crunch and burst of salinity, not measured by the teaspoon and stirred into a batter or dough the way table or kosher salt would be. Substituting a finishing salt for a cooking salt (or vice versa) misses the entire point of why each exists in the first place — one is functional throughout a dish, the other is a deliberate final touch.

Why chefs prefer kosher salt for cooking specifically

Beyond the conversion math, there's a real, practical reason professional kitchens lean toward kosher salt over table salt for everyday cooking: its larger, irregular crystals are easier to pick up and sprinkle evenly by hand (a technique called "pinching") than table salt's fine, uniform grains, which clump together more and are harder to distribute with the same control. This is a texture-and-handling advantage, not a flavor one — sodium chloride tastes the same regardless of crystal shape once dissolved.

Table salt's fine crystals do have a genuine advantage in baking specifically, where dissolving evenly and quickly into a batter matters more than hand-sprinkling control — which is part of why baking recipes default to table salt far more consistently than savory cooking recipes do, and why swapping a coarser kosher salt into a baking recipe at an equal volume (rather than adjusting for the density difference) is a common source of under-salted baked goods.

A practical rule for reading any recipe's salt measurement

When a recipe just says "salt" with no further specification, it's most commonly written with table salt in mind by default, particularly in baking, where table salt's fine, consistent crystal size is the more common assumption. When a recipe specifies "kosher salt" without naming a brand, checking whether the recipe was developed by a source known to favor Diamond Crystal (many professional and restaurant-adjacent recipes are) versus one that doesn't specify is worth a moment's thought before measuring by volume.

The safest habit, regardless of which salt is in your pantry: taste and adjust as you go wherever the dish allows it, and treat any recipe's stated salt measurement as a reasonable starting point rather than a fixed target — a principle that matters more for salt than for almost any other ingredient on this site, given how directly and immediately an over- or under-salted dish announces the mistake.