Sodium vs salt: what is the difference?

Sodium is one part of salt

The CDC describes sodium chloride as about 40% sodium and 60% chloride by weight. That means 1 gram of ordinary table salt contains roughly 400 milligrams of sodium, while 1 gram of sodium corresponds to roughly 2.5 grams of salt.

The exact relationship comes from the molecular masses of sodium and chloride. For everyday nutrition calculations, rounding is appropriate because food labels and household measures are themselves rounded.

Why food labels report sodium instead of salt

The Nutrition Facts panel reports sodium in milligrams because sodium can come from sodium chloride and from other sodium-containing ingredients. Measuring only the salt that you add at the table would miss sodium already present in the food.

FDA consumer guidance gives examples of sodium-containing additives such as monosodium glutamate (MSG), sodium bicarbonate, sodium nitrite and sodium benzoate. Their sodium is included in the total sodium declared on the label.

Salt added during cooking is only part of total sodium intake

CDC and FDA guidance both emphasize that much of the sodium in the U.S. diet comes from packaged, prepared and restaurant foods. A person can use very little salt at the table and still consume substantial sodium through breads, sauces, soups, sandwiches, cured meats, prepared dishes and snacks.

This is why the sodium number on the label is more useful for tracking intake than trying to estimate only the salt you can see.

How to convert sodium to an equivalent amount of salt

A practical conversion is:

Salt (g) ≈ sodium (mg) ÷ 393.4

For example, 2,000 mg sodium corresponds to about 5.1 g sodium chloride. The Sodium to Salt Converter performs the calculation in both directions.

Why teaspoons of salt are only an approximation

Household teaspoons measure volume, while nutrition guidance is normally expressed as sodium mass. Crystal size and packing can change how much a teaspoon of a particular salt weighs. A mass-based conversion is therefore more consistent than treating every teaspoon of every salt as identical.

Specialty salts still contain sodium

Sea salt, kosher salt, rock salt and other culinary salts can differ in crystal size, texture and trace minerals, but sodium chloride remains the main salt component in ordinary culinary use. A different appearance does not make sodium disappear.

For a packaged specialty salt, use the product label when you need the sodium amount for a measured serving.

Where to go next

If you are trying to understand a packaged food, start with the food-label guide. If an ingredient list contains unfamiliar sodium terms, use the Hidden Sodium Ingredient Finder.