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⚡ Reference · 2026One primary figure answers most of the questions: USDA FoodData Central puts a 1 fl oz espresso shot at about 63 mg of caffeine. Everything on this page is either that figure, arithmetic on it, or a second sourced figure — and each number says which it is.
Written and reviewed by the CoffeeLabAdvisor editorial team · Published 2 September 2026
A single 1 fl oz espresso shot carries about 63 mg of caffeine, per USDA FoodData Central. Multiples follow by arithmetic — a double is ~126 mg, a triple ~189 mg — and the FDA cites 400 mg a day as an amount not generally associated with dangerous effects for healthy adults. The interesting questions are the comparisons, and they all turn on the unit: per ounce, espresso is the most caffeinated common coffee; per cup, a big mug of brewed usually wins.
| Drink | Caffeine | Where the number comes from |
|---|---|---|
| Single espresso (1 fl oz) | ~63 mg | USDA FoodData Central |
| Double espresso (doppio) | ~126 mg | 2 × the USDA figure (arithmetic) |
| Triple (3 shots) | ~189 mg | 3 × the USDA figure (arithmetic) |
| Brewed coffee, 8 oz | ~95 mg | USDA FoodData Central |
| Latte / cappuccino | Same as their shots | Milk adds no caffeine; the espresso inside sets the number |
| FDA daily guidance | 400 mg | FDA, for healthy adults — not a target, a ceiling reference |
Two things the table quietly settles: a milk drink's caffeine is decided entirely by its shot count — our shot size guide covers what those shots are — and “espresso has less caffeine than coffee” and “espresso has more caffeine than coffee” are both true, at different units.
Roast level changes caffeine far less than folklore says; the practical difference is density. Dark-roasted beans are lighter and larger for the same weight, so a scoop by volume of dark roast contains slightly less coffee — and therefore slightly less caffeine — while dosing by weight nearly equalises the roasts. “Stronger” in the dark-roast sense describes flavour, not chemistry. If you dose with a scale (our ratio calculator assumes you do), roast level is not your caffeine lever — shot count is.
Espresso concentrates: ~63 mg into one ounce. Brewed coffee dilutes: ~95 mg across eight ounces, about 12 mg per ounce. Cold brew sits lower still per ounce as commonly served, though concentrates vary — our cold brew vs espresso guide covers that comparison on its own. So the ranking by ounce and the ranking by serving are nearly opposites, and any “which has the most caffeine” claim that omits its unit is answering a different question than it was asked.
About 63 mg per 1 fl oz shot, per USDA FoodData Central. Real shots vary with dose, bean and extraction, so treat it as a sound central figure rather than a lab result for your cup.
Roughly 126 mg — twice the USDA per-shot figure, since a double is simply two shots' worth of coffee. That is comparable to a strong 8 oz cup of brewed coffee and well under the FDA's 400 mg daily guidance.
Roughly 189 mg by the same arithmetic — slightly less than half the FDA's 400 mg daily guidance for healthy adults.
About 189 mg. USDA FoodData Central puts a 1 fl oz shot at roughly 63 mg, so three shots is that figure multiplied by three — arithmetic on a sourced number, not a separate measurement. That is under half the FDA’s 400 mg daily guidance for healthy adults.
Per ounce, yes — by several times (USDA: ~63 mg per 1 oz shot versus ~95 mg per 8 oz brewed cup, i.e. ~12 mg/oz). Per serving, a mug of brewed coffee usually carries more total caffeine than a single shot. The honest answer depends on the unit.
Roasting changes caffeine very little; the practical difference comes from how you dose. Dark-roasted beans are less dense, so a scoop by volume contains slightly less coffee — while dosing by weight nearly equalises the two. "Dark roast is stronger" describes flavour, not caffeine.
Per ounce: espresso and other concentrated extractions. Per cup: large servings of brewed or cold-brew coffee, simply because there is more liquid. Brands marketing "extra caffeine" blends achieve it mainly through dose and blend choice — the drink format still dominates the total.
Three shots is roughly 189 mg by USDA figures — under half the 400 mg the FDA cites as an amount not generally associated with negative effects for healthy adults. Individual sensitivity, pregnancy and medical conditions change the picture; that guidance is the FDA's, not medical advice from us.
Primary figures: USDA FoodData Central's espresso entry (~63 mg caffeine per 1 fl oz shot; equivalently ~212 mg per 100 g) and its brewed-coffee entry (~95 mg per 8 oz), read 2026-09-02; the 400 mg daily guidance is the FDA's published figure for healthy adults. Shot multiples are arithmetic on the USDA per-shot figure and labelled as such in the table. Real-world shots vary with dose, bean and extraction; no number here is a measurement of your cup, and none of this is medical advice.