Calories in Coffee: Nutrition Facts & Serving Sizes
Per 1 cup (248g)
Per 100g
Source: USDA FoodData Central, SR Legacy, March 2026.
One cup of black coffee (248g) contains just 5 calories with 0.7g of protein, 0.5g of carbs, and 0g of fat. Per 100g, black coffee provides only 2 calories. This means black coffee is essentially a zero-calorie beverage. Potassium provides 50mg per 100g (about 120mg per cup). Niacin at 0.8mg per 100g contributes to energy metabolism. Sodium is only 1mg per 100g. Magnesium provides 4mg per 100g and phosphorus provides 3mg per 100g. Black coffee contains no sugar and no fat. All the calories in coffee drinks come from added ingredients like milk, cream, or sweeteners. For anyone tracking macros, black coffee is one of the best tools for appetite suppression and mental focus without impacting calorie targets.
Nutrition Highlights
Calories by Serving Size
| Serving | Cal | Protein | Carbs | Fat | Fiber |
|---|---|---|---|---|---|
| 1 cup (248g) | 5 | 0.7g | 0.5g | 0g | 0g |
| 100g | 2 | 0.3g | 0.2g | 0g | 0g |
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Full Nutrition Facts (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Calories | 2 | |
| Protein | 0.3g | 1% |
| Total Fat | 0g | |
| Total Carbohydrates | 0.2g | |
| Dietary Fiber | 0g | |
| Sugars | 0g | |
| Sodium | 1mg |
Vitamins & Minerals (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Calcium | 2mg | 0% |
| Potassium | 50mg | 1% |
| Magnesium | 4mg | 1% |
| Phosphorus | 3mg | 0% |
| Niacin (B3) | 0.8mg | 5% |
% Daily Values based on a 2,000 calorie diet (FDA reference).
Health Benefits of Coffee
Black coffee is one of the most studied dietary compounds for health and performance. Caffeine, the primary active compound, is a proven ergogenic aid that enhances muscular endurance, reduces perceived exertion, and improves focus during training. The performance benefits typically kick in at 3-6mg of caffeine per kg of body weight.
Regular coffee consumption is associated with reduced risk of type 2 diabetes, Parkinson's disease, and certain liver conditions in long-term epidemiological studies. The polyphenols and antioxidants in coffee contribute to these protective effects.
Caffeine also has well-documented appetite-suppressing effects, which can be useful on a cut. Drinking black coffee before meals may reduce total calorie intake at that meal.
The thermogenic effect of caffeine modestly increases metabolic rate. While this effect is small (3-5% increase in calorie burn), it compounds over time. Many pre-workout supplements simply replicate the caffeine in a cup of coffee.
For weight loss and body composition, black coffee is one of the most valuable tools available. At 5 calories per cup, you can drink 2-3 cups without meaningful caloric impact. The key is keeping it black or using minimal, low-calorie additions.
Dietary Considerations
Black coffee is compatible with all diets including keto, vegan, paleo, and weight loss plans. It has essentially zero calories when consumed black. For keto, coffee with added fats (butter coffee) is popular. For weight loss, black coffee is one of the best appetite-suppression tools available. The caffeine content is a consideration for anyone sensitive to stimulants or with anxiety. High intake (more than 4-5 cups daily) may disrupt sleep and cause dependency.
Daily Intake (100g)
100g of coffee provides 0% of a 2,000-calorie diet.
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Frequently Asked Questions
How many calories in coffee?
Black coffee has only about 5 calories per cup (248g). Per 100g, it contains just 2 calories. The calorie count increases significantly with added milk, cream, or sweeteners.
Is coffee good for weight loss?
Yes, black coffee supports weight loss. At 5 calories per cup, it adds virtually nothing to your calorie count. Caffeine suppresses appetite and has a mild thermogenic effect. Coffee before workouts also enhances performance, helping you burn more calories during training.
Does coffee break intermittent fasting?
Black coffee is generally considered acceptable during intermittent fasting. At 5 calories per cup with no carbs or protein, it does not trigger an insulin response or break the metabolic state of fasting for most purposes. Adding milk or sugar would break a fast.
How much caffeine is in coffee?
A standard 8 oz cup of brewed coffee contains approximately 80-100mg of caffeine, though this varies by brewing method and bean type. Espresso contains about 63mg per 1 oz shot. This information is not in the USDA nutritional data but is widely established.
Is black coffee keto?
Yes, black coffee is perfectly keto-friendly. It has essentially zero carbs (0.5g per cup) and zero fat. It is one of the best beverages for a ketogenic diet. Many keto dieters add butter or MCT oil to create bulletproof coffee.
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