You can use flaky sea salt instead of table salt at a ratio of 1:1 by weight (about 2x by volume). Salt swaps are not about the saltiness of the salt — all salt is sodium chloride — they are about the size and shape of the crystals, and that is where most people go wrong. Salts differ by crystal size, so swap by weight, not by volume — kosher salt is far lighter per cup than table salt. A teaspoon of fine table salt packs far more salt into the spoon than a teaspoon of big, hollow kosher flakes, so a cup-for-cup swap can easily double the salt or halve it. The ratio above is the sourced ratio for this pair, and the table below scales it to the amounts recipes actually call for.
This matters more than it sounds. Salt is the one ingredient in almost every recipe, and it is the one where a small measuring error is immediately obvious: too little and the dish tastes flat, too much and it is inedible. That is why this guide spends time on weighing. A kitchen scale removes the whole problem — the same weight of any salt is the same amount of salt, whatever the crystal size. If you cook with more than one kind of salt, a scale is the single best purchase you can make, and it costs less than a bag of good flaky salt.
The ratio, in a table
| Table salt called for | Flaky sea salt (by volume, approximate) |
|---|---|
| 1/2 tsp | about 1 tsp |
| 1 tsp | about 2 tsp |
| 1 tbsp | about 2 tbsp |
| 1/4 cup | about 1/2 cup |
Flaky salt is mostly air between the crystals, so the same weight takes up roughly twice the space. Weigh it if you can; if you cannot, use the volume amounts above and taste before serving. The numbers in the table are the ratio 1:1 by weight (about 2x by volume) scaled up and down. All amounts in this guide are approximate, and the ratio comes from CookScale's substitution data rather than from a single brand's packaging. If the recipe matters — a cake for a celebration, a batch you are selling, or anything where a small error shows — weigh the ingredients on a kitchen scale and taste as you go. If you are in doubt, undershoot: add two-thirds of the salt, taste, and add the rest. You can always add more salt at the end of cooking, but you cannot take it out, and an over-salted pot is a much bigger problem than an under-salted one.
Worked examples
Example 1: A chocolate chip cookie, finished properly
A cookie recipe calls for 1 teaspoon of table salt in the dough. Use about 2 teaspoons of flaky sea salt instead, and the dough will be seasoned the same — but keep back a pinch of the flakes to sprinkle on top of the cookies before baking. The flakes on top stay crunchy and give little bursts of salt against the sweet chocolate, which is the whole point of flaky salt. The cookies will look and taste like a bakery cookie, and the salt on top is what people notice first.
Example 2: A steak, seasoned and finished
A steak recipe calls for 1 tablespoon of table salt to season the meat. Use about 2 tablespoons of flaky sea salt, and crush the flakes lightly between your fingers as you scatter them so they distribute evenly. The salt on the surface of the steak draws out moisture, which then dissolves the salt and gets reabsorbed — that is the dry-brining effect, and it works with flakes just as well as with fine salt, as long as you give it time. Finish the rested steak with a final pinch of flakes for crunch.
Example 3: A focaccia with a salty top
A focaccia recipe calls for 1 teaspoon of table salt in the dough and a scattering on top. Use about 2 teaspoons of flaky salt in the dough, and save a generous pinch for the top, pressed into the dimples with the olive oil before baking. The flakes on top will stay crunchy and catch the light, and the bread will have a salty, crackling crust that fine salt cannot give. The dough itself will be seasoned exactly the same, because the weight is the same.
What changes in the result
The flavour change is none once the salt has dissolved, but the texture change is the whole point of this swap: flaky salt stays crunchy, and that crunch is what you are buying. A flake on top of a cookie or a steak gives a little burst of salt and a delicate crunch that fine salt cannot give, because fine salt disappears into the food. Inside a dough or a sauce, the flakes dissolve just like any other salt, and the result is identical — so this swap is really two swaps in one: the same salt inside the dish, and a better salt on top of it. The volume difference is the trap: flakes are mostly air, so the same weight takes up about twice the space.
Texture changes too, in ways that have nothing to do with saltiness. Fine salt dissolves quickly and disappears into a sauce or a dough; coarse flakes dissolve slowly and can leave crunchy pockets if they are added late. Flaky salt sprinkled on top of a finished dish stays crunchy and gives little bursts of salt — that is its whole appeal. Kosher salt is the cook's favourite for seasoning by hand because the big crystals are easy to pinch and scatter evenly, and you can see where it has landed. None of this changes the flavour of the salt itself, but it changes how the dish eats, and that is what the cook is really choosing.
When not to substitute
Do not swap salts cup-for-cup; Diamond Crystal kosher salt is about half the weight of table salt per cup. Do not swap cup for cup — a cup of flaky salt weighs roughly half as much as a cup of table salt, so a volume swap will under-salt the dish badly. Do not use expensive flaky salt inside a stew or a soup, where its crunch disappears entirely and you are paying for a texture nobody will taste. Save it for the top of the dish.
There are also jobs where one salt is simply the wrong tool. Do not use a coarse salt in a recipe where it has to dissolve quickly and completely — a smooth sauce, a meringue, a brine that needs to be exact — unless you give it time and stirring. Do not use a flavoured salt, like the celery salt in this guide's family, where the extra flavour would clash: it is a seasoning in its own right, not a neutral stand-in. And do not use an expensive finishing salt inside a dough or a stew, where its crunch and its delicate flavour disappear entirely. Save the good salt for the top of the dish, where you can taste it.
Practical guidance
Keep one salt as your everyday cooking salt and learn its measure by feel — most cooks use kosher salt for that, because it is easy to pinch and forgiving to scatter. Keep a small dish of flaky salt by the stove for finishing, and keep table salt for baking, where its fine crystals dissolve evenly and its exact measure matters. Label your containers, because kosher salt and table salt look similar in a jar and they are not interchangeable by the spoonful. When a recipe just says 'salt' with no kind given, it usually means table salt in older books and kosher salt in newer ones — if the result tastes under-salted, the recipe probably meant the finer salt, and if it tastes over-salted, it probably meant the coarser one. Taste as you cook, salt in stages rather than all at once, and remember that sauces and soups concentrate as they reduce, so the salt you add at the start tastes stronger by the end.
Keep flaky salt in a small bowl by the stove, not in a shaker — you cannot shake flakes, and you season with them by pinching. A pinch of flaky salt between thumb and forefinger is about a quarter of a teaspoon, and once your hand knows that measure you will season faster and more accurately than any spoon. Do not grind flaky salt: grinding destroys the flakes, which is the entire point of it.
Frequently asked questions
Why is flaky sea salt so expensive?
Because of how it is made. Flaky salt is evaporated slowly in shallow pans so the crystals grow into delicate, hollow flakes, and much of it is still harvested and packed by hand. You are paying for the texture — the crunch and the way the flakes dissolve on the tongue — not for a different flavour. Use it where that texture shows, on top of a finished dish, and use a cheaper salt inside the dish.
Can I use flaky salt in baking?
In the dough, yes, by weight — it dissolves like any other salt. On top, it is at its best: a pinch of flakes on a cookie, a brownie or a focaccia before baking gives a salty crunch that fine salt cannot match. Do not use it in a smooth batter where it has to dissolve instantly, unless you give it time and stirring.
Can I just swap salts 1:1 by volume?
Only if the two salts have similar crystal sizes. Fine sea salt and table salt are close enough for most cooking, and the ratio for this pair is 1:1 by weight (about 2x by volume). But kosher salt and flaky salt are much lighter per spoonful, so a 1:1 volume swap under-salts the dish — sometimes by half. The safe rule is to swap by weight: the same weight of any salt is the same amount of salt, whatever it looks like.
Why do recipes specify a brand of kosher salt?
Because the two big brands are different densities. Diamond Crystal kosher salt is light and hollow, Morton is denser and heavier, so a teaspoon of one is not a teaspoon of the other. A recipe written for Diamond Crystal needs about one and a half teaspoons per teaspoon of table salt, while Morton needs about one and a quarter. If a recipe does not say which brand, Diamond Crystal is the usual assumption in American recipes.
Does the kind of salt change the flavour?
Barely, once it is dissolved. All salt is sodium chloride, and dissolved in a soup or a dough the differences are tiny. What changes is texture — flakes stay crunchy on top of a dish — and the trace minerals in some sea salts, which can add a very faint bitterness or sweetness that most people cannot detect in a finished dish. Choose salt for its crystal size and how you use it, not for a flavour difference you probably cannot taste.