Coffee Caffeine: Compare the Drink and the Serving

Caffeine is a naturally occurring stimulant in coffee, tea and cocoa. Milligrams (mg) describe its amount; milliliters (ml) and fluid ounces describe the drink's volume.

Coffee Caffeine Compared by Preparation and Serving

These references describe different preparations and portions: the FDA publishes typical drink ranges, Health Canada lists preparation-specific average amounts, and EFSA gives approximate serving examples. Compare the stated coffee and portion instead of averaging figures from different entries.

Other Health Canada entries for 237 ml (8 US fl oz) are 135 mg for its general “brewed” category, 118 mg for percolated coffee and 3 mg for roasted-and-ground decaf. For a particular soluble coffee, the instant-coffee guide shows how a manufacturer's stated powder dose differs from a generic cup reference.

Espresso Concentration Versus Caffeine Per Cup

A smaller espresso can be more concentrated while containing less total caffeine. EFSA's approximate serving examples illustrate the distinction:

Use the per-100-ml column to compare concentration and the stated portion to compare the whole drink. EFSA's espresso example does not define every café's “single shot”; the espresso guide explains those serving conventions.

Scale a Known Coffee to Your Portion

Two equal portions of the same well-mixed coffee contain twice the caffeine of one. Adding plain water lowers its concentration but leaves the caffeine already in the whole drink. Passing more water through grounds is different: that can change extraction as well as volume.

When using product information, match the unit. A figure per 100 ml scales with your poured volume; a figure per 100 g needs your serving's weight. Dry coffee, prepared coffee and drinking-water input are different quantities.

How the concentration and serving examples are calculated

For a volume-based reference, divide its caffeine by its stated milliliters, then multiply by the volume being compared. EFSA's espresso example gives 80 ÷ 60 × 100 = 133 mg per 100 ml after rounding. Its filter example gives 90 ÷ 200 × 100 = 45 mg per 100 ml.

The portions below all scale that same approximate EFSA filter-coffee reference, rather than measuring other coffees:

Calculated portions of the same EFSA filter-coffee example

Calculated portions of the same EFSA filter-coffee example

Portion	Calculated caffeine
250 ml (8.5 US fl oz)	113 mg
473 ml (16 US fl oz)	213 mg
500 ml (16.9 US fl oz)	225 mg

These calculations are rounded to whole milligrams. They apply only if the same caffeine concentration is retained.

Decaf, Half-Caf and Mixed Coffee Drinks

Decaf contains less caffeine, rather than necessarily none. The FDA gives a separate typical range of 2–15 mg per 237 ml (8 US fl oz) brewed decaf. Health Canada's decaf entries above describe its own preparation categories. The decaf guide explains residual caffeine and why a bean-processing removal percentage is not a cup measurement.

A half-caf blend combines regular and decaffeinated coffee. For example, Peet's describes Middle Ground as a blend of the two. The blend's name does not establish milligrams in a prepared cup. Equal weights of regular and decaf beans also do not guarantee exactly half the caffeine of an unrelated regular drink.

For a mixed drink, identify each caffeine-containing part:

• A latte needs its actual espresso portion; a larger milk drink does not necessarily contain more espresso.
• A mocha includes caffeine from cocoa as well as coffee.
• A red eye combines brewed coffee and espresso, so both contribute.

For cold brew, first identify ready-to-drink coffee versus concentrate and the dilution used. The finished glass size alone does not describe how much coffee concentrate it contains.

Tea, Soft Drinks and Energy Drinks: FDA References

The FDA compares these drinks at the same 355 ml (12 US fl oz) volume.

The FDA's brewed-coffee range in the first table overlaps its energy-drink range here. For a particular can or café order, compare its declared caffeine and the amount you will drink, rather than assuming the category with the stronger reputation always contains more.

What Beans, Roast and Product Labels Tell You

Robusta beans generally contain more caffeine than Arabica beans, as the National Coffee Association's species reference explains. Species is useful context, but the coffee dose, preparation and portion are still needed to describe the drink. The Arabica–Robusta comparison separates the bean distinction from a fixed cup value.

For roast comparisons, compare the same dry mass and defined preparation. Equal scoops can contain different weights. A dark color, bitter taste or printed intensity rating is not a caffeine measurement. Country and processing names identify the coffee; they do not supply a measured caffeine amount for your cup.

To use an exact product declaration:

1. Identify the product and preparation. Check the market, flavor, package size and whether the directions describe concentrate, soluble powder, a capsule or a finished drink.
2. Find the caffeine basis. Read whether the amount applies to one serving, a whole container, a capsule or a stated weight or volume.
3. Use your actual portion. Follow the preparation directions, then scale the declared amount only to the quantity consumed.
4. Check other ingredients. Tea, cocoa and other caffeine-containing additions can contribute separately.

If the amount is not supplied, ask the manufacturer or café for its information for that exact preparation. Keep an unavailable value unknown instead of estimating it from roast color or taste. The ready-to-drink guide gives a whole-container and partial-container label example.

Sources and Further Reading

• FDA: Spilling the Beans, How Much Caffeine Is Too Much?: typical drink categories at 12 US fl oz, a separate 8-US-fl-oz decaf range and product-information context. Its drink table draws on published 2015 dietary-exposure work.
• Health Canada: Caffeine in Foods, updated April 2, 2025: preparation-specific average references, retaining each coffee category and the source serving.
• EFSA: Caffeine: approximate espresso and filter-coffee examples, with the source's variability and preparation context. Per-100-ml and larger-portion values on this page are calculations from those examples.
• National Coffee Association: Varieties: the qualitative Arabica–Robusta caffeine distinction. Bean percentages are not converted into an assumed brewed-cup amount.
• Peet's: Middle Ground: a producer's regular-and-decaf blend example, not a measured caffeine figure or a product ranking.