How much alcohol is in a Maß, and why Oktoberfest beer takes longer to hit you than it should

Short answer: a Maß is one litre, festival beer is typically around 6% ABV, and 1000 ml × 6% × 0.789 g/ml comes to roughly 47 grams of pure ethanol in a single vessel, close to four 40 ml shots of 40% spirit. And yet it will reach your bloodstream more slowly than almost anything else on the table. Not because it is beer, and not because it is weak, but because ethanol absorption is fastest at around 22% ABV and slows toward both extremes.

A Maß is a volume problem, not a strength problem

The instinct is to read festival beer as "stronger beer". It is, a little: the Märzen style is brewed to about 6% against roughly 5% for a standard lager. But that one percentage point is not what makes a Maß remarkable. The litre is.

Pour that same 6% beer into a 330 ml glass and you have about 16 grams of ethanol, a perfectly ordinary drink. Serve it in a one-litre stein and you have 47 grams: about three and a half Continental small beers, in one hand, with no natural pause between them. The vessel is doing more work than the recipe.

It is also, by coincidence, exactly the ceiling: CheersCount caps a saved drink template at 1000 ml, so a Maß sits precisely at the largest serving the app will let you define.

Absorption speed peaks at 22% ABV, not at the strongest drink

Here is the part that contradicts almost everyone's intuition. If you asked a table of people which drink enters the bloodstream fastest, most would say the spirits, and a few would say the beer because it is drunk quickly. Both are wrong. The relationship between beverage strength and absorption speed is non-monotonic: plotted against ABV, absorption time is a V-shape with its floor at roughly 20-30% and rising on either side (Roine 1991; Wilkinson 1977; Mitchell 2014).

Both ends are slow, for unrelated reasons:

• Dilute drinks are slow because of the fluid. A litre of 6% beer presents a shallow concentration gradient across the gastric mucosa and, more importantly, a large volume that has to be emptied into the small intestine before most of the ethanol can be absorbed. The stomach is the bottleneck, and you have just filled it.
• Concentrated drinks are slow because of the stomach's reaction to them. Ethanol at 40% and above irritates the gastric and pyloric mucosa and provokes pylorospasm (the pyloric valve tightening), which delays gastric emptying and produces a lower, later peak.

The fast lane sits between them: something around 22%, strong enough to diffuse steeply but not strong enough to make the stomach clamp down. A fortified wine or a strong liqueur is, in absorption terms, the most efficient delivery vehicle on the table. The Maß is at the opposite end of the curve from the schnapps, and both are slower than the drink nobody suspects.

The numbers the model actually uses

CheersCount implements this as a multiplier on the baseline absorption time, so below 1.0 means faster than baseline and above 1.0 means slower. The baseline itself depends on stomach contents, running from about 45 minutes on an empty stomach out to 120 minutes on a full one. The strength multiplier is clamped to the 0.70 to 1.50 range at both extremes, so the figures below assume an empty stomach.

Strength is only half of it, though, and this is where a Maß stops being an ordinary beer. Absorption time is scaled by serving volume as well, at volume / 250 ml, bounded to the 0.80 to 1.50 range. A litre is four times the 250 ml reference, so a Maß is pinned at 1.50, the ceiling. A 40 ml shot is pinned at 0.80, the floor. The two multipliers compound.

Read the strength column on its own and the V-shape is clear: 0.77 at lager strength, down to 0.70 at 22%, back up to 1.08 at overproof. Read the combined column and you get the answer that actually applies at the table, which is blunter. The Maß is the slowest drink on the list, at roughly 52 minutes against about 32 for a neat shot. It is the only row above 1.00, meaning the only one slower than the model's own baseline.

Which is the whole point of the post, in one comparison: a Maß carries 3.75 times the ethanol of that shot and takes 63% longer to arrive. It is simultaneously the biggest dose and the slowest delivery on the table, and those two facts feel like they should cancel out. They do not. The dose is real either way; only the timing of the bill changes.

Note the asymmetry in the strength curve: it rises more steeply above the optimum (0.01 per percentage point) than below it (0.004). That is deliberate, because the pylorospasm delay from high-proof spirits is a stronger effect than the dilution penalty at the beer end. An earlier version of this model used a simple straight line, which had the embarrassing consequence of making beer the fastest-absorbed drink in the catalogue. The V-curve replaced it.

The same dose, three strengths

The cleanest way to see the effect is to hold the alcohol constant and vary only the concentration. Below are three curves the model actually produces for the same 20 grams of ethanol in a 75 kg, 175 cm male on an empty stomach. Twenty grams is 507 ml of 5% beer, 115 ml of 22% liqueur, or 42 ml of 60% overproof spirit.

Identical dose, three different nights. The 22% serving peaks at 0.29 ‰ after 23 minutes; the beer peaks at 0.23 ‰ after 39. That is a 24% higher peak, arriving 16 minutes sooner, from exactly the same amount of alcohol. The overproof spirit lands between them at 0.26 ‰ after 32 minutes, which is the part that surprises people: the strongest drink on the chart is not the fastest.

Look at the right-hand half and all three collapse onto the same slope. Elimination is zero-order, a constant mass per hour, so concentration changes the shape of the rise and the height of the peak but not the rate of the descent. Whatever the model shaves off your peak, it does not shorten the tail.

What that means across an afternoon in the tent

Put the two halves together and the shape of a festival afternoon becomes predictable. Each Maß is a large dose (47 grams, roughly three and a half small beers) arriving through the slowest channel available. That combination has a specific and unhelpful signature.

The rise is gradual enough that the second Maß tends to be ordered before the first has finished arriving. Because gastric emptying is rate-limited by volume, the ethanol from drink one is still being delivered while drink two is being poured, and the curve stacks. The peak lands later than the drinking does, often after the tent, on the walk, or at the table where somebody suggests a schnapps. Elimination, meanwhile, is zero-order: a roughly constant mass per hour that does not speed up to match the volume of the input. A litre-scaled input against a fixed-rate output is why the tail of a festival day runs so much longer than the day itself.

None of which is an argument against a Maß. It is an argument for knowing that "it hasn't hit me yet" and "it isn't going to" are different statements, and that the first one is exactly what a slow absorption curve feels like from the inside.

What this model cannot see

Two honest limitations, both worth stating before anyone treats the table above as precision.

The V-curve is a population-level shape. Individual gastric motility varies considerably between people and between days, and the model has no way to observe yours. The multiplier describes what happens on average at a given concentration, not what will happen to you this afternoon. Individual blood alcohol runs roughly ±20-30% away from any population model, this one included, which is why CheersCount draws an uncertainty band rather than a confident line.

The model also ignores dilution from what you drink alongside it. A shot taken with a mixer really does behave differently from the same shot taken neat, and this engine does not simulate it. That is a deliberate omission rather than an oversight: the V-curve means diluting a 40% spirit moves it toward the fast end of the curve, so the naive assumption that watering a drink down slows it is the wrong way round, and modelling it badly would be worse than leaving it out. It remains a real effect the estimate does not capture.

Frequently asked questions

Track a festival day and watch the curve

Every number above is visible in the app rather than buried in it: log a Maß and the estimated curve, the absorption window and the uncertainty band are drawn from the same constants this post quotes. The full science explainer lists each one with its citation. Open CheersCount in your browser (installable PWA, works on iPhone and Android) or get the Android app on Google Play. Both are free, with a 30-day Pro trial included.

Related reading: who actually uses drink-tracking apps, and an honest comparison with the other trackers.

Sources

• Roine, R.P., Gentry, R.T., Lim, R.T. Jr, Baraona, E., Lieber, C.S. (1991). Effect of concentration of ingested ethanol on blood alcohol levels. Alcohol Clin Exp Res 15:734-738.
• Wilkinson, P.K. et al. (1977). Pharmacokinetics of ethanol after oral administration in the fasting state. J Pharmacokinet Biopharm 5:207-224.
• Mitchell, M.C. et al. (2014). Absorption and peak blood alcohol concentration after drinking beer, wine, or spirits. Alcohol Clin Exp Res 38:1200-1204.
• Kechagias, S. et al. (2015). Reliability of breath-alcohol analysis in individuals with and without gastrointestinal disease. Cited for gastric handling of concentrated ethanol.

CheersCount's BAC estimate is an educational tool, not a medical or legal instrument. If you're concerned about your alcohol use, talk to a health professional. The absorption constants above describe the model as implemented and are population averages, not individual predictions.