Caffeine, Honestly

The short black tastes like rocket fuel. The mug of filter looks mild next to it. So the short black has more caffeine, right?

Not by much, and sometimes not at all. How strong a coffee tastes and how much caffeine it carries are two different things, and mixing them up is why most people's caffeine maths is off. Here is how much caffeine is really in your cup, using government lab numbers instead of internet guesses.

Two things we have already covered, so we will keep them short. Roast colour barely moves caffeine, and if anything light roast edges dark. That argument lives in Dark Roast vs Light Roast. The bean species matters a lot more, which we got into in The Words on a Coffee Bag That Mean Nothing. Everything below is about the part you control. What you brew, and how much coffee goes into it.

Strong Taste Is Not Strong Caffeine

Espresso is concentrated. Water gets pushed through a tight puck of fine coffee in under thirty seconds, and what comes out is thick and intense. Mouthful for mouthful, it is the most caffeinated thing on the menu.

But nobody drinks coffee by the mouthful. You drink it by the cup, and a shot is tiny. That is where the picture flips.

Here is caffeine per 100 mL from the Australian Food Composition Database, the one Food Standards Australia New Zealand (FSANZ) maintains. It has no entry for filter coffee, so that row is the US Department of Agriculture's figure.

Espresso is about seven times more concentrated than filter. Now do the cup sizes. Our People Everyday double shot comes out at 40 grams, which at that average is about 115 mg. A 250 mL mug of filter at 40 mg per 100 mL is about 100 mg. Same ballpark, from two drinks that could not look more different.

And the averages hide a lot. When Griffith University researchers bought 97 espressos from cafes on the Gold Coast and tested every one, the average was 106 mg. The range ran from 25 mg to 214 mg. Same order, same word on the menu, and one cup carried more than eight times the caffeine of another.

Count the Grams, Not the Millilitres

Here is the thing you notice when you weigh coffee all day. Caffeine follows the grams of ground coffee in the brew. Not the size of the cup, not the colour of the roast, not how bitter it tastes.

Caffeine dissolves easily, and a lot of it comes out early. Another Griffith study showed this nicely with capsule coffee. A short ristretto from the same pods carried 51 mg on average, and a long lungo carried 66 mg. A lot more water, only about 30 per cent more caffeine. The coffee in the capsule set the ceiling, not the water.

So look at how much coffee actually goes into each drink. These doses are straight from our brew guide.

Read that again. The double shot in a small flat white holds more coffee than a big mug of pour over. And a latte is the same double shot as a flat white with more milk poured on top. Milk adds creaminess, not caffeine. If your cafe's large gets an extra shot, the caffeine goes up. If it is only more milk, it doesn't. Ask.

Our own blends show the same thing. Hyperdrive is the one people buy for the kick, and on espresso it actually goes in the basket a gram lighter than People Everyday, 19 g against 20 g. On the V60 recipe it flips, 18 g against 15 g. So if a Hyperdrive pour over hits harder, thank the extra grams. The roast is the flavour.

How Much Caffeine Is Too Much

FSANZ finished a full review of caffeine in March 2026. For healthy adults who are not pregnant, it found no adverse effects from up to 210 mg in one go, or up to 400 mg across a day. In pregnancy the line is 200 mg a day.

FSANZ also did the conversion for us. 400 mg is roughly two 300 mL flat whites, or four 300 mL mugs of instant.

Two big milk coffees. That is a normal morning for plenty of people, before anything after lunch. Coffee supplies about two thirds of all the caffeine Australian adults take in, so it is the number worth knowing. And the cafe spread matters here too. A University of Glasgow study tested 104 espressos from coffee shops in Scotland, Italy and Spain, and the strongest carried 317 mg. One cup, well past the one-sitting level on its own.

Keep the Ritual, Lose the Jitters

None of this means drink less coffee. It means know what is in the cup, then steer.

Count shots, not cups. Two double-shot coffees is four shots of coffee. If you love the flavour but not the load, ask for a single shot in your usual.

Weigh it at home. Grams decide your caffeine, so a scale tells you exactly what you are drinking. It is the $30 fix for everything else too.

Make the afternoon one decaf. Caffeine stays in your system long after the cup is empty, so the afternoon cup is the one to swap. We explained the timing in Decaf, Explained.

Stop judging by taste. A mellow mug of filter or a milky latte can carry as much caffeine as a punchy short black. Your tongue reads flavour. It cannot read caffeine.

The BOM Take

The colour of the bag and the bite of the cup are not a caffeine gauge. They are flavour. The caffeine is in the grams, and grams are something you can count.

So know your number, drink the coffee you actually love, and swap the afternoon cup for decaf if sleep matters to you. That is the whole system. No app required.

Keep reading: Decaf, Explained · Dark Roast vs Light Roast · The $30 Fix That Makes Every Cup Better · The Brew Guide

Want to taste what we're talking about? Check out our blends and we'll keep you sorted.

Written by Jos at Brother of Mine, specialty coffee roasters in Perth.