Kosher Salt vs Table Salt
Quick Verdict
Both are roughly the same chemical (NaCl). The differences are physical — grain size, density, and what's added (iodine, anti-caking agents).
For seasoning by hand: kosher salt. The large flakes are easier to pinch, distribute evenly, and harder to over-salt with.
For baking and recipes that measure precisely: table salt. Smaller, denser grains give consistent volume measurements.
For iodine: table salt (when iodized) is essentially the only meaningful dietary iodine source for many people.
You can't 1:1 swap them. A teaspoon of table salt is roughly 1.5–2× as salty as a teaspoon of kosher salt.
Head-to-Head
| Factor | Kosher Salt | Table Salt | Winner |
|---|---|---|---|
| Sodium chloride | ~99% | ~97–99% | Tie |
| Grain shape | Coarse flake / pyramid / flat | Tiny cubic crystals | Different jobs |
| Density (per cup) | 0.56 g/mL (Diamond Crystal) – 0.79 g/mL (Morton) | ~1.20 g/mL | Different uses |
| Sodium per teaspoon | ~1,200 mg (Diamond) / ~1,920 mg (Morton) | ~2,300–2,400 mg | Recipe-dependent |
| Iodine | None | Usually iodized (45 mcg/tsp) | Table salt |
| Anti-caking agents | Usually none | Yes (silicon dioxide, sodium ferrocyanide, etc.) | Kosher (cleaner) |
| Pinch-ability | Excellent — chunky flakes you can feel | Slips through fingers — hard to gauge | Kosher |
| Dissolution speed | Slower (larger crystals) | Faster (small crystals) | Use-dependent |
| Distribution on food | Even, visible flakes | Risk of clumping, less even | Kosher |
| Best for baking | Inconsistent if measured by volume | Reliable, fine, dissolves cleanly | Table salt |
| Best for brining | Dissolves cleanly in large volumes; no anti-caking residue | Anti-caking agents can cloud brine | Kosher |
| Price | $0.50–$1.50/lb | $0.30–$0.80/lb | Table salt |
Why Kosher Salt Isn't Actually "Kosher Salt"
The name is misleading. Kosher salt isn't certified kosher (any salt can be) — it's salt used for koshering, the Jewish ritual of removing blood from meat. The large, coarse flakes are particularly good at drawing out moisture from a meat surface, which is what koshering requires. Outside Jewish dietary law, the same physical properties make it ideal for everyday seasoning.
The Critical Conversion Problem
If you've ever followed a recipe that says "1 teaspoon salt" without specifying which kind, you've potentially made it 30–50% saltier or less salty than the developer intended.
| Recipe calls for… | Use this much… |
|---|---|
| 1 tsp table salt | ~1¼ tsp Morton kosher OR ~2 tsp Diamond Crystal kosher |
| 1 tsp Morton kosher | ~¾ tsp table salt OR ~1½ tsp Diamond Crystal |
| 1 tsp Diamond Crystal kosher | ~½ tsp table salt OR ~⅔ tsp Morton kosher |
| 1 tablespoon table salt | ~1½ tbsp Morton OR ~2 tbsp Diamond Crystal |
By weight, all three are roughly equivalent: 6 grams of any salt seasons the same. The volume differences exist because the crystals pack with different efficiency. This is why professional and serious home cooks weigh salt rather than measure by volume.
Iodine: The Hidden Stakes
Iodized table salt was introduced in the U.S. in 1924 specifically to combat iodine deficiency, which had caused widespread goiter (thyroid enlargement) in the "goiter belt" of the Great Lakes region. It worked — goiter rates collapsed within a decade.
Most kosher salt is not iodized. Neither are most sea salts, Himalayan salts, or specialty salts. Households that have switched entirely to kosher or specialty salts may have unintentionally cut their main dietary iodine source. This usually doesn't matter — most diets include enough iodine from dairy, eggs, seafood, or commercial bread (which is often made with iodized salt). But for people on restricted diets, particularly vegans who don't eat sea vegetables, iodine deficiency from salt-source switching is a real and documented phenomenon.
The Anti-Caking Question
Table salt usually contains additives to prevent clumping in humid kitchens — most commonly silicon dioxide (food-grade silica), sodium aluminosilicate, or sodium ferrocyanide. All are well within food-safe levels at the doses present. Some people find the trace bitterness perceptible; most don't. If you object to additives or want a cleaner brine for fermentation/curing, kosher salt is typically additive-free.
When to Use Each
Reach for kosher salt when:
- Seasoning meat and vegetables by hand
- Brining or wet-curing
- Pasta water and blanching water
- Roasting and most stovetop cooking
- Garnishing finished dishes (small flakes — Maldon is better for big ones)
- Fermentation (no anti-caking agents to interfere)
- You want forgiveness — easier to feel how much you're using
Reach for table salt when:
- Baking (especially recipes with small salt amounts)
- You need iodized salt for dietary iodine
- Salt shakers — table salt flows; kosher clogs them
- Recipes that explicitly call for "table salt"
- Dissolving in cold liquids fast (cocktails, batters)
- You're on a tight grocery budget
- Very precise volume measurements (the small grains pack consistently)
The Diamond vs Morton Wrinkle
Not all kosher salt is created equal. Diamond Crystal uses a proprietary "Alberger" process that produces hollow, flaky pyramid crystals that crumble between fingers. It's roughly half as dense as Morton kosher and is the chef's default. Morton kosher is denser, flatter, more uniformly flake-shaped, and significantly saltier per volume. If you've been told "use kosher salt" without a brand specified, the assumption in most American recipes is Diamond Crystal — using Morton without adjustment will over-salt the dish.
Recommendation
Most home cooks should keep both.
Kosher salt in a small open bowl or cellar near the stove for hands-on seasoning, brining, and most cooking.
Table salt (iodized) in the shaker for the table, in baking, and as your primary iodine source.
If choosing one: kosher salt for the cooking flexibility, with awareness that you'll need to think about iodine elsewhere in your diet.