Salt in Coffee: Why It Works, How Much to Add and Recipes

Adding a small pinch of salt to coffee makes it taste less bitter and a little sweeter and rounder, without making it taste salty. Sodium suppresses how strongly your tongue picks up bitterness, so it is a quick fix for harsh, over-extracted or dark-roast coffee. Use very little: about a sixteenth of a teaspoon per cup, or a pinch in the grounds before brewing. If you can taste salt, you used too much.

Why Salt Makes Coffee Taste Less Bitter

Coffee’s bitterness comes only partly from caffeine. Research at the Technical University of Munich found that most of it comes from compounds formed during roasting, chlorogenic acid lactones in lighter roasts and phenylindanes in darker ones, which is why dark roasts usually taste more bitter.

Taste scientists have long known that salt suppresses bitterness when the two are mixed: the sodium dulls the bitter signal, which lets sweetness and other flavors come forward. It is the same reason a pinch of salt goes into chocolate desserts and onto grapefruit. In coffee, that means a smoother cup with no added sugar or calories.

How to Add Salt to Coffee

1. Use fine or flaky salt. Kosher, sea or table salt all work; finer salt dissolves faster.
2. Start with less than you think. A tiny pinch per cup, stirred in well.
3. Taste, then adjust. If it is still harsh, add a few more grains. If you can taste salt, start over with less.
4. For a whole pot, sprinkle a small pinch over the grounds before brewing so it spreads evenly.

Salt is a patch, not a cure. If your coffee is regularly bitter, the real fix is usually in the brewing: grind a little coarser, use water just off the boil rather than boiling, shorten the brew time, or try a lighter roast. Our guide to why coffee tastes bitter or sour walks through the fixes, and the beginner’s guide to brewing covers the basics.

Salt Coffee Around the World

• Vietnamese salt coffee (cà phê muối). From the city of Huế: strong phin coffee with condensed milk, topped with a lightly salted whipped cream. See our Vietnamese iced coffee recipe for the coffee base.
• Taiwanese sea salt coffee. Iced coffee or an iced latte topped with a layer of salted cream, popularized by Taiwanese café chains.
• Turkish wedding coffee. In a playful Turkish tradition, a bride-to-be serves her suitor a cup of Turkish coffee loaded with salt to see if he can drink it without complaining.

Sea Salt Cream Coffee Recipe

Is Salt in Coffee Healthy?

In the tiny amounts used here, salt adds only a little sodium to your day: a teaspoon of salt contains about 2,300 mg of sodium, the US recommended daily limit, so a sixteenth of a teaspoon adds roughly 150 mg. Using salt instead of sugar does cut calories. If your doctor has told you to limit sodium, for example because of high blood pressure, count it like any other salt or skip it.

Should You Try It?

If your coffee tastes harsh, or you are trying to cut back on sugar, a pinch of salt is worth a try. It works best on dark roasts, office or diner coffee and cold brew made from dark beans. With a good, well-brewed light roast, it is usually unnecessary. Our comparison of dark and medium roast explains why darker coffee tastes more bitter in the first place.