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Coffee (unsweetened) Calories
Zero calories, antioxidant source, unsweetened
In season: Spring · Summer · Autumn · Winter
CALORIES
GI
POTASSIUM
FIBER
Quick answer
1 cup (medium) of Coffee (unsweetened) (240 g) has 5 calories. That works out to 2 calories per 100 g. It contains 0 g of carbs, 0.5 g of protein, 0 g of fat and 0 g of fiber. Its 0.7 mg of B3 covers 5% of the Daily Value. Its glycemic index is 0 (low), so it raises blood sugar slowly.
What is Coffee (unsweetened)?
Unsweetened coffee is made by brewing ground, roasted coffee beans with hot water. It is enjoyed around the world, with methods ranging from espresso and filter brewing to immersion brewing; the beans themselves have roots in coffee-growing regions of Africa and the Middle East.
Its flavour can be fruity, nutty, smoky or pleasantly bitter, depending on the beans and how they are brewed. People drink it at breakfast, during work breaks or after a meal, often alongside a small snack. Served without sugar or additions, it contributes very little energy—about 2 calories per 100 g—and contains naturally occurring antioxidant compounds. If you find it too bitter, try a shorter brew or a splash of milk; either will change the drink’s flavour and nutritional profile.
Coffee (unsweetened) Nutrition Facts
Selected: 100 g
2
KCAL / 100G
Carbs
0g
· 0% DV
Protein
0.2g
· 0% DV
Fat
0g
· 0% DV
Fiber
0g
· 0% DV
DV is the share of the daily value covered, on a 2,000 kcal reference diet.
Calories come from: Carbs 0% · Protein 100% · Fat 0%
Coffee (unsweetened) Vitamins & Minerals
Vitamins
B3
0.3mg · 2% DV
B2
0.01mg · 1% DV
Folate
2µg · 1% DV
B5
0.02mg · 0% DV
Minerals
Magnesium
7mg · 2% DV
Potassium ⭐
49mg · 1% DV
Phosphorus
7mg · 1% DV
Sodium
2mg · 0% DV
How Nutritious Is Coffee (unsweetened)?
Nutrient density
Low
How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.
Satiety score
Medium
An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.
Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.
Coffee (unsweetened) Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
How to Burn Off Coffee (unsweetened)
To burn the 2 calories in 100 g:
🚶
Walking (5 km/h)
🏃
Running (8 km/h)
🚴
Cycling
🏊
Swimming
Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.
Is Coffee (unsweetened) Processed?
NOVA 2
Minimally Processed
1. Unprocessed
2. Minimally Processed
3. Processed
4. Ultra-Processed
NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.
Does Coffee (unsweetened) Contain Allergens?
No known major allergens
Which Diets Is Coffee (unsweetened) Good For?
Vegan
✓ Suitable
Vegetarian
✓ Suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
✓ Suitable
Low FODMAP
— Not suitable
Coffee (unsweetened) Fat Profile
SATURATED
0g
MONOUNSATURATED
0g
POLYUNSATURATED
0g
Compare Coffee (unsweetened)
Foods Similar to Coffee (unsweetened)
Frequently Asked Questions About Coffee (unsweetened)
Does unsweetened coffee contain caffeine?
Yes, unsweetened coffee usually contains caffeine; leaving out sugar does not remove it. The amount varies with the beans, serving size, and brewing method. Decaffeinated coffee is a separate option and still may contain a small amount.
Does unsweetened coffee dehydrate you?
No, moderate unsweetened coffee intake generally does not dehydrate regular coffee drinkers. Caffeine can briefly increase urination, but the liquid in the coffee still contributes to your fluid intake.
Can unsweetened coffee help with weight loss?
No, unsweetened coffee does not cause weight loss or burn body fat on its own. Choosing it instead of a sweetened coffee can avoid added sugar, but coffee is not a substitute for the habits that drive weight change.
Is unsweetened coffee okay to drink on an empty stomach?
Yes, unsweetened coffee is generally okay on an empty stomach, but it can trigger heartburn, nausea, or stomach discomfort in some people. If that happens to you, try having it with food or after breakfast.
Does unsweetened coffee affect sleep?
Yes, caffeine in unsweetened coffee can make it harder to fall asleep and may reduce sleep quality. If you notice this, move your coffee earlier in the day; switching to decaf later on is another option.
Can you drink unsweetened coffee while fasting?
For many calorie-restricted intermittent fasts, plain unsweetened coffee is allowed because it has no added sugar or milk. Religious fasting rules differ, so follow the rules of your fast; coffee during a no-drink period breaks it.
Does unsweetened coffee cause acid reflux?
It can. Unsweetened coffee may worsen reflux symptoms in some people, and removing sugar does not necessarily prevent that effect. If coffee reliably triggers symptoms, try a smaller serving, a different brew, or avoiding it.
Is unsweetened coffee good before a workout?
Unsweetened coffee can be useful before a workout because its caffeine may increase alertness and reduce the feeling of effort. It can also cause jitters or stomach upset, so avoid it before exercise if you experience those effects.
How should you store brewed unsweetened coffee?
Store leftover brewed unsweetened coffee in a clean, covered container in the refrigerator rather than leaving it out. It tastes best freshly made; discard it if its smell or appearance changes, and avoid reheating it repeatedly.
Does unsweetened coffee raise blood pressure?
It can temporarily raise blood pressure, particularly in people who are sensitive to caffeine or do not drink coffee regularly. The response varies, so if you monitor your blood pressure, note whether readings change after coffee.
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Nutrition data compiled from USDA FoodData Central and scientific sources.