A pint of beer typically contains between 10 and 20 grams of carbohydrate — about the same as a thick slice of bread. That surprises people in both directions: less than the "liquid bread" reputation suggests, but far more than fits comfortably into a strict low-carb diet. And the range across styles is wide enough to matter, from under 5g in an engineered low-carb lager to 25g or more in some alcohol-free wheat beers.
Here's where beer's carbs actually come from, how the styles compare, and a straight answer on the keto question.
Where the carbs in beer come from
Beer starts as sugary water. Malted barley is steeped and mashed to extract its sugars, and yeast then ferments most of those sugars into alcohol. The carbs left in your glass are the leftovers — mostly dextrins, chains of sugar molecules too long for brewer's yeast to digest, plus small traces of unfermented sugar.
This has a consequence worth understanding: the carbs in beer are mostly not sugar. A typical pint of lager contains well under a gram of actual sugar, even while carrying 12 to 15g of total carbohydrate. So when a beer brand boasts "zero sugar", it's usually true and usually beside the point — the dextrins are still there, your body still digests most of them as carbohydrate, and the calories still count. Sugar content and carb content are different lines on the label; low-carb dieters need the second one.
It also means beer's calories mostly aren't carbs. Alcohol carries about 7 calories per gram against carbohydrate's 4, and in most beers the alcohol contributes well over half the total. That's why calorie counts track ABV so closely — a story we've told brand by brand in our calories in a pint of lager guide.
Carbs by style: the rundown
Approximate figures per 568ml pint, based on widely published per-100ml values. Recipes vary enormously within styles — these are honest ranges, not gospel, and the label always wins:
| Style | Approx. carbs per pint |
|---|---|
| Low-carb lager (Skinny Lager, Michelob Ultra) | 4–7g |
| Dry Irish stout (Guinness) | 10–18g |
| Standard lager (Carling, Stella, Peroni) | 10–17g |
| Bitter / pale ale | 12–18g |
| IPA | 14–22g |
| Wheat beer | 15–22g |
| Alcohol-free beer | 10–28g |
A few notes on the surprises in that table.
Stout is not the carb bomb it looks like. A pint of Guinness carries around 18g of carbs — the same territory as an IPA and barely above a premium lager. The blackness comes from roasted barley, which colours the beer without sweetening it, and dry Irish stout is, as the name says, dry.
IPAs run higher than lagers. More malt goes into the kettle to balance all those hops, and heavily hopped beers are often left with a little more body and residual carbohydrate. A big 6%+ IPA can top 22g; the modern lower-ABV IPAs land closer to lager territory.
Alcohol-free beer is the trap. With no full fermentation to strip the sugars out, many 0.0% beers carry more carbs than their alcoholic parents — alcohol-free wheat beers can reach 25g a pint or more, which is why they're marketed as isotonic sports drinks in Germany. They're excellent for calories, poor for carbs. Both things are true at once, and our ranking of the lowest calorie beers in the UK flags which is which.
Cider plays by different rules. Dry cider is one of the lowest-carb drinks in the pub; sweet and fruit ciders are loaded with genuine sugar and can triple a lager's carb count. The full picture is in our calories in a pint of cider guide.
The keto question, answered honestly
Can you drink beer on keto? Mostly, no — and it's better to hear that straight than to be sold a workaround. A strict ketogenic diet allows perhaps 20 to 50g of carbs a day. One ordinary pint takes a third to a half of that allowance; two pints of IPA can blow the whole day. Beer is genuinely one of the worst-fitting drinks for keto, which is why keto forums are full of people mourning it.
The partial exceptions are the engineered options. Skinny Lager at about 3.3g per 330ml bottle and Michelob Ultra at about 2.2g per 330ml can slot into a keto day if you're disciplined about everything else. A couple of low-carb bottles is workable; a session is not.
Two more honesty clauses. First, alcohol itself isn't a carb and doesn't directly break ketosis, but your body burns it before anything else, so fat-burning is paused while you drink — low-carb beer slows keto progress even when it doesn't technically break the rules. Second, if you're serious about keto and unwilling to give up alcohol entirely, dry wine and neat spirits fit the numbers far better than any beer. We'd rather tell you that than pretend otherwise.
For the more relaxed low-carber — cutting carbs rather than counting them — beer is easier to accommodate. Swap IPAs and wheat beers for dry stout or standard lager, favour halves, and one pint costs you no more carbs than the sandwich you didn't have.
What actually matters
If your concern is weight rather than carbs specifically, don't lose the plot in the grams: beer's calories are mostly alcohol, and the single most effective change is drinking a weaker beer, not a lower-carb one. A 4% pint beats a 5% pint by more calories than the carb difference between almost any two styles. Carb-counting beer is a precision tool for people on genuinely low-carb diets; for everyone else, ABV is the number to watch.
All figures here are approximate, derived from widely published per-100ml values — recipes change constantly, so check the label when the numbers matter to you.
Burn a few carbs between breweries
Our preferred way to make room for a pint has always been to walk for it. Our brewery tours link breweries and taprooms on foot in cities across the UK — several miles, several tastings, and a guide who can tell you exactly what's in the glass. If you know someone who'd enjoy earning their beer that way, our gift vouchers arrive by email and never expire.