How Much Caffeine Is in Coffee, Tea and Common Energy Products?

Caffeine amounts are ranges, not fixed numbers, because brewing methods, bean variety, serving size and brand all shift the outcome. The table below gives widely cited reference ranges, then explains the caveats that matter.

Caffeine Comparison Table

These figures align with published references from the FDA and NIH; individual products vary.

Why Ranges, Not Exact Numbers

Several factors move caffeine within (and occasionally beyond) these ranges:

1. Serving size. A "cup" can mean 6, 8, 12 or 16 ounces depending on who is pouring. Most cafe coffees are far larger than the 8-oz reference serving.
2. Brew method and strength. Longer extraction, finer grind, hotter water and higher coffee-to-water ratios all increase caffeine in the cup.
3. Bean variety. Robusta beans contain roughly twice the caffeine of arabica.
4. Tea steeping. Steeping time and leaf amount change a tea's caffeine substantially; the 47 mg figure for black tea assumes a standard steep.
5. Product formulation. Energy drinks and energy supplements each set their own caffeine per serving, which is why their range is so wide - always check the label.

Reading Caffeine on a Label

For packaged drinks and supplements, the label is the only authoritative source:

• Find caffeine per serving (sometimes listed in the supplement facts or ingredient list).
• Check servings per container - a large can may hold two or more servings.
• Note caffeine-containing botanicals like guarana, green tea extract or yerba mate, which add caffeine beyond any stated figure. See Hidden Sources of Caffeine.

For context on a specific mid-range number, see What Does 50-60 mg of Caffeine Mean? - roughly the caffeine in half a cup of brewed coffee.

The FDA's Reference Point

The FDA cites 400 mg per day as an amount not generally associated with negative effects for healthy adults. That is a population-level reference, not a personal recommendation - sensitivity varies widely between individuals, and specific health conditions, pregnancy and medications change the picture. The FDA's consumer guidance covers this in detail.

Putting the Numbers Together

A rough daily picture for a coffee drinker: two 8-oz cups of brewed coffee is around 160-200 mg; a coffee plus a black tea adds another ~47 mg; a cola adds ~22 mg. Energy products add whatever their labels state. Adding these up across a day - including the hidden caffeine in tea, chocolate and supplements - is the most useful habit this page can teach.

The Takeaway

Brewed coffee runs about 80-100 mg per 8 oz, with tea, espresso and cola lower and energy products varying widely. Because serving sizes and brewing vary, treat published numbers as reference points and use the label for anything in a package.

If you want to compare a labeled option, the pHit category on MarketPlace Global states its caffeine amount per serving on the label.