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A 125ml glass of Brut Prosecco carries somewhere between 0 and 1.5g of sugar. That's low by any measure, and it makes Prosecco one of the lighter things you can order.
But Brut is only one of five sweetness levels, and the labelling is genuinely counterintuitive. A glass at the sweet end of the range carries more than 6g, which is around fifteen times the driest option. Most people have no idea which one they're buying, because the word on the bottle doesn't mean what it sounds like it means.
Sugar in Prosecco by classification
Extra Dry is sweeter than Brut, and Dry is sweeter still
This is the single most useful thing to know about buying fizz, and it catches out almost everybody.
The order from driest to sweetest runs: Brut Nature, Extra Brut, Brut, Extra Dry, Dry, Demi-Sec. So a bottle labelled "Dry" is the third sweetest option available, carrying up to 32g per litre. A bottle labelled "Extra Dry" carries more sugar than one labelled "Brut", despite sounding like it should carry less.
The reason is historical. In the nineteenth century all sparkling wine was sweetened heavily, because that's what the market wanted. "Brut" simply meant raw or unsweetened, and it was a novelty. As tastes shifted drier, the terminology stayed put and new categories were bolted on underneath. The result is a scale that reads backwards to anyone encountering it for the first time.
Extra Dry is the most common style of Prosecco on UK supermarket shelves. If you've been buying Prosecco assuming it was the dry option, there's a reasonable chance you've been drinking the off-dry one.
Where the sugar comes from
Two stages, and the second one is deliberate.
Prosecco is made by the tank method, where a second fermentation happens in a pressurised vessel rather than in the bottle. Fermentation converts grape sugar into alcohol, and if it runs to completion very little sugar is left.
Then comes dosage. After fermentation, most producers add a small measure of sugar solution to the finished wine. It isn't about making the wine taste sweet, at least not at the drier end. It's about balance: Glera grapes give high acidity, and a few grams of sugar rounds the edges off and stops the wine tasting austere.
A Brut Nature skips this step entirely. Nothing is added, which is why it's also called zero dosage, and why those wines taste noticeably sharper and more mineral.
So the sugar in your glass is mostly a decision, not a leftover. Someone chose how much to put back in.
Prosecco, Champagne and Cava compared
The sweetness classifications are the same across all three, since they're set by EU wine law rather than by region. What differs is convention.
Champagne is overwhelmingly sold as Brut, and the trend over the past two decades has been towards drier still, with Extra Brut and Brut Nature becoming much more common. Cava follows a similar pattern, and Brut Nature Cava is widely available and generally excellent value.
Prosecco skews sweeter. Extra Dry dominates, and Brut is the drier option rather than the default. If you're buying on sweetness alone, Cava will usually get you drier for less.
There's a flavour difference behind that. Champagne and Cava use the traditional method, with the second fermentation in bottle and extended time on the lees, which builds bready, toasty complexity. Prosecco's tank method keeps it fresh, floral and fruit-forward. Neither is better, but the toasty character of a traditional-method wine carries dryness more comfortably, which is part of why those regions went drier first.
We've explained the lees process properly in our guide to lees ageing and sur lie.
Is that actually a lot of sugar?
No, and this is worth putting in proportion rather than alarming anyone.
The NHS recommends adults have no more than 30g of free sugars a day, which is roughly seven sugar cubes. The World Health Organization suggests going further, to below 5% of total energy intake, or around 25g a day.
Against that, a glass of Brut Prosecco at 1.5g is trivial. Even a glass of Demi-Sec at 6g is a fifth of the daily maximum, which is less than a small chocolate bar.
For comparison, the British Heart Foundation puts a 330ml can of cola at 35g of free sugars, which is the whole day's allowance in one can. A standard chocolate bar is 25g.
So Prosecco is not where your sugar problem lives. The reason to care about the classification is more about calories, taste and knowing what you've bought than about the sugar figure alone.
Sugar, calories and the bigger picture
Sugar contributes 4 calories per gram. Alcohol contributes 7, which is close to fat at 9. So in almost any wine, alcohol is doing the heavy lifting on the calorie count and sugar is a supporting player.
That's why a Brut Nature at 12% and a Brut at 11% can land at similar calorie figures despite very different sugar levels. The strength matters more.
Sparkling wine tends to be the lightest category of wine overall, because the base wines are picked early to preserve acidity, which means less sugar going in and lower alcohol coming out. Most Prosecco sits at 11 to 11.5%, against 13% or more for a lot of still white wine.
More on how that works across the range in our guides to calories in a glass of wine and sugar in wine.
Why the label often tells you nothing
Even armed with the classifications, there's a gap you can't close from the shelf.
Alcoholic drinks above 1.2% ABV are not legally required to display nutritional information in the UK, and research by the Portman Group found that fewer than half do so voluntarily. So while the sweetness category is printed, the actual gram figure usually isn't.
That matters because the Brut band is wide. Anything from 0 to 12g per litre can be called Brut, and two bottles at opposite ends of that band are meaningfully different drinks. Without a number, Brut tells you the ceiling and nothing else.
It's the same problem across still wine, and it's why we publish the figures on every product page rather than leaving people to guess from the style.
Our sparkling range
Every bottle below is full strength, with sugar and calorie figures confirmed with the producer rather than estimated from the style.
If you want the driest thing on the list, it's one of the three Brut Nature bottles. Zero dosage means no sugar solution was added after fermentation at all, so what you're tasting is the wine itself with nothing rounding it off.
The Tapas Cava is the lightest at 77 calories. The Mas Macia Reserva has spent a minimum of 18 months on the lees, which gives it a toast and baked apple character you won't find in a young Prosecco. The Ayala is the Champagne, with a deliberately prolonged autolysis and no sugar to hide behind.
One point of honesty on the Skinny Witch Prosecco Rosé: it carries around 1g of sugar per glass rather than none. Still very low, and well inside Brut, but it isn't a zero sugar wine and we won't list it as one.
How to buy dry Prosecco
Common questions
Is Prosecco high in sugar? Not by the standards of most drinks. A glass of Brut carries up to 1.5g against 35g in a can of cola. Demi-Sec is the one to be careful with.
Which Prosecco has the least sugar? Brut Nature, also sold as zero dosage. Nothing is added after fermentation.
Is Prosecco keto friendly? A Brut or Brut Nature, generally yes. See our keto wine collection.
Does Prosecco have fewer calories than white wine? Usually, largely because it's made at lower strength. A glass of Prosecco at 11% is around 78 calories against 114 for a 13% still white.
Is Prosecco vegan? It depends on the fining agent, not the grape. Several of ours are certified vegan and marked on the product page. Our guide to vegan wine explains how fining works.
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Please drink responsibly. UK guidance is no more than 14 units a week, spread across three or more days, with several drink-free days.
View Our Lower Calorie Sparkling Wine Collection