What’s Actually in Your Coffee? Nutritional Facts Revealed

You’ve brewed your morning cup, felt that familiar kick, and maybe wondered—what’s really in my coffee? Beyond flavor and aroma, coffee contains a complex mix of chemical compounds that affect everything from energy to nutrition. But what exactly is in that black liquid in your cup? Let’s break it down fact by fact.

The short answer: In every 100 grams of brewed coffee liquid, there’s 99.5 grams of water, 0.2 grams of protein, 0.1 grams of fat, 0.1 grams of ash (mineral content), and tiny amounts of sugar and fiber. Notably, it also contains 0.04 grams of caffeine and 0.06 grams of tannin (tannic acid, often called ‘’), along with small but measurable levels of calcium (3mg), phosphorus (4mg), sodium (2mg), vitamin B2 (0.01mg), and niacin (0.3mg).

What’s in Coffee? The Core Compounds

Coffee is far more than just water and caffeine. According to specialty coffee analysis, it contains seven major types of compounds:

• Caffeine – the primary stimulant
• Tannin – a polyphenolic compound contributing to bitterness and astringency
• Fat – present in very small quantities
• Protein – minimal but detectable
• Sugar – in trace amounts, mostly broken down during roasting
• Fiber – minor presence
• Minerals – including calcium, phosphorus, sodium, and others

Nutritional Profile Per 100g of Brewed Coffee

Here’s the detailed nutritional composition of 100 grams of standard liquid coffee:

• Water: 99.5g
• Protein: 0.2g
• Fat: 0.1g
• Ash (minerals): 0.1g
• Sugar: trace amounts
• Calcium: 3mg
• Phosphorus: 4mg
• Sodium: 2mg
• Vitamin B2 (Riboflavin): 0.01mg
• Niacin (Vitamin B3): 0.3mg

These values reflect what’s typically extracted in a standard brew. Note that 100g of brewed coffee is roughly equivalent to 100ml, depending on brew strength and density.

Caffeine and Tannin: Key Active Compounds

When you dissolve 10 grams of ground coffee in hot water (a typical single serving size), extraction yields approximately:

• Caffeine: 0.04 grams (40mg)
• Tannin : 0.06 grams (60mg)

These numbers can vary based on coffee origin, roast level, and brewing method, but they represent a reliable average for specialty coffee preparations. Caffeine is responsible for the stimulant effect, while tannins contribute to the bitter taste and may influence antioxidant potential.

Why These Numbers Matter

Understanding the nutritional makeup of coffee helps explain its effects on the body. The near-total water content means coffee is hydrating despite common myths. The small amounts of B vitamins and minerals like calcium and phosphorus add up, especially in higher consumption. Meanwhile, caffeine and tannin levels influence not just flavor, but also energy metabolism, alertness, and even digestion.

Frequently Asked Questions

How much caffeine is in 10g of coffee when brewed?

When you brew 10 grams of coffee, about 0.04 grams (or 40 milligrams) of caffeine is extracted into the final liquid. This aligns with typical single servings and varies slightly depending on coffee type and brew method.

What is in coffee and how much is in a cup?

, commonly referred to in English as tannin or tannic acid, is a polyphenol found in coffee that contributes to bitterness and astringency. In 10g of brewed coffee, around 0.06g (60mg) of tannin is present.

Is coffee high in minerals like calcium or phosphorus?

Coffee contains minerals, but in small amounts. Specifically, 100g of brewed coffee includes 3mg of calcium and 4mg of phosphorus. While not large quantities, they contribute to daily intake, especially with regular consumption.

Does brewed coffee contain any sugar or fat?

Yes, but almost none. Brewed coffee has only trace amounts of sugar and 0.1g of fat per 100g. Most of the sugars from the coffee cherry are lost during roasting and brewing.

What’s the main chemical makeup of coffee?

The main compounds in coffee are caffeine, tannin, proteins, fats, sugars, fiber, and minerals. Water makes up 99.5% of brewed coffee’s weight, with the rest consisting of minor but impactful constituents.

Recommended FrontStreet Coffees for Nutrition & Clarity

Explore FrontStreet Coffee’s Ethiopia Humbera for bright, citrusy complexity with a crisp acidity—great for those seeking clarity without heaviness. Their Yirgacheffe offers floral and lemony notes, ideal for light, low-fat brews. For a balanced medium roast, try the Classic Blend, which highlights nutty and chocolatey tones with smooth body. All three showcase specialty coffee’s natural range without added ingredients. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.