How Many Calories Are In A Cup Of Coffee Black?

A standard 8-ounce cup of black coffee contains about 2 calories. The exact number can vary slightly depending on how the coffee is brewed, but it is almost always under 5 calories. Black coffee is close to calorie-free because it is mostly water, and only a tiny amount of the coffee bean’s natural oils and solids make it into your cup.

How Many Calories Are In A Cup Of Coffee Black?

A plain 8-ounce cup of black coffee made from roasted coffee beans and water contains approximately 2 calories. The United States Department of Agriculture (USDA) lists black brewed coffee at 2 calories per 8 ounces. This number holds true for drip coffee, pour-over, and most standard brewing methods.

The calorie count is so low that it is often listed as zero on nutrition labels, because labeling rules allow rounding down for foods with fewer than 5 calories per serving. But scientifically, there are about 2 calories in that cup. If you drink a larger cup, say 12 ounces, it will have about 3 calories. A 16-ounce mug totals around 4 calories.

These calories come from trace amounts of oils, carbohydrates, and a small amount of protein that dissolve from the ground coffee into the water during brewing. They are negligible in the context of a typical daily calorie intake.

Why Does Black Coffee Have So Few Calories?

Coffee beans are seeds from the fruit of the coffee plant. Before roasting, they contain carbohydrates, fats, and proteins. But almost all of those calories remain in the spent coffee grounds. Water extracts only a tiny fraction of the soluble solids—about 1 to 2 percent of the bean’s mass.

Of the compounds that do end up in the brew, most contribute flavor and aroma, not calories. Caffeine itself has no calories. The small amount of soluble fiber and oils that make it into the cup account for the 2 calories you get.

Roasting also changes the chemistry of the bean. Darker roasts break down more carbohydrates and produce more oil on the surface. However, even dark roast coffee still only contributes about 2 calories per cup. The difference between light and dark roast is not meaningful from a calorie standpoint.

Does Brewing Method Change the Calorie Count?

Different brewing methods extract slightly different amounts of solids, but the calorie differences are minimal. Here is what you can expect with common methods for an 8-ounce serving:

• Drip coffee: about 2 calories
• French press: about 2 to 3 calories, because the metal mesh allows more fine particles and oils into the cup
• Espresso: a single 1-ounce shot has roughly 1 to 2 calories. A double shot is about 3 calories. But espresso is rarely served in 8-ounce doses without milk
• Cold brew: the concentrate is often diluted before drinking. An 8-ounce serving of diluted cold brew has about 2 to 4 calories. The longer steep time can extract slightly more solids, but not enough to change the big picture
• Instant coffee: instant typically has about 4 calories per 8-ounce cup when prepared as directed, because the serving includes a small amount of dried coffee solids that are fully dissolved

In all cases, the calorie range is 1 to 5 calories per cup. The difference is not worth worrying about for weight management or health purposes.

What About Decaf Coffee or Different Bean Types?

Decaffeinated coffee has essentially the same calorie count as regular black coffee. The decaffeination process may remove some compounds, but the calorie content remains about 2 calories per 8-ounce cup. Caffeine contributes no calories, so its absence does not change the number.

Bean variety—Arabica versus Robusta—also makes no meaningful difference. Robusta beans contain slightly more soluble solids, but the resulting brew still falls in the same low-calorie range. Single-origin or blended coffees, regardless of origin, all produce black coffee with about 2 calories per cup.

The only way black coffee’s calorie count changes meaningfully is when you add anything to it—milk, cream, sugar, syrup, or butter. A tablespoon of cream adds about 50 calories. A teaspoon of sugar adds about 16 calories. A flavored latte can easily carry 200 to 300 calories.

Can Black Coffee Fit Into a Fasting Plan?

Many people who practice intermittent fasting drink black coffee during the fasting window. Because it contains very few calories (about 2 per cup), it is generally considered acceptable for maintaining a fasted state. The calories are low enough that they do not trigger a significant metabolic response in most people.

Some strict fasting protocols that allow zero calories may still advise against it. However, the majority of evidence and popular guidance suggests black coffee does not break a fast for the purposes of weight loss or metabolic health. If you are following a specific medical fasting protocol, check with your healthcare provider.

Adding milk, cream, or sugar will break a fast. Black coffee alone is widely considered safe.

Why Some People Think Coffee Has More Calories

The confusion usually comes from two sources. First, coffee drinks at cafes are rarely just black coffee. A plain “coffee” order might come with cream already added unless you specify black. The calorie total on a café menu for “coffee” often includes milk or cream.

Second, some people mistake the calories from caffeine or coffee’s thermogenic effect for actual calorie content. Caffeine can slightly increase metabolism, but it adds no calories to your body. Another myth is that coffee contains hidden sugars or fats—it does not, unless you add them yourself.

Bulletproof coffee and similar concoctions that blend coffee with butter or MCT oil are high-calorie drinks. These are deliberately designed to add calories, but they are not black coffee. When someone says coffee has significant calories, they are almost always describing a drink with added ingredients.