Red wine is relatively low in carbohydrates. A standard 5-ounce glass of dry red wine contains roughly 3.4 to 4 grams of carbs, which puts it among the lowest-carb alcoholic drinks you can choose. That said, the number shifts depending on the style of wine, and sweetness makes a bigger difference than most people realize.
Carbs in a Glass of Red Wine
USDA data puts a 5-ounce glass of red wine at about 3.8 grams of carbohydrates, including around 1 gram of sugar. There’s no fiber in wine (unlike fresh grapes), so the total carb count and the net carb count are essentially the same number. For context, that’s less than a single bite of bread.
The carbs in wine come from residual sugar, the small amount of grape sugar left over after fermentation. In dry wines, yeast converts most of the sugar into alcohol, leaving very little behind. The drier the wine, the fewer carbs it contains.
How Different Red Wines Compare
Most popular dry reds cluster in a narrow range:
- Pinot Noir: 3.4 g per glass (the lowest common option)
- Merlot: 3.7 g
- Shiraz: 3.8 g
- Cabernet Sauvignon: 3.8 g
- Chianti: 3.8 g
- Grenache and Petit Syrah: around 4 g
- Burgundy (traditional style): up to 5.5 g
Sweet and fortified reds are a different story. Wines like Port, Lambrusco, and sweet Moscato carry significantly more sugar, which drives both the carb count and the calorie count well above dry reds. A medium-sweetness wine can land between 5 and 10 grams of carbs per glass, while a particularly sweet wine can exceed 10 grams. The rule is simple: the sweeter the wine tastes, the more carbs it has.
Red Wine vs. Beer and Spirits
Compared to most other alcoholic drinks, dry red wine sits near the bottom of the carb scale. Regular lagers typically contain 10 to 15 grams of carbs per pint. Stouts, porters, and real ales can reach 20 grams or more. Even light beers, marketed as low-carb options, carry up to 10 grams per pint, though some dip below 5.
Distilled spirits like vodka, gin, whiskey, and rum contain zero carbs because the distillation process removes sugars entirely. If pure carb count is your only concern, spirits are technically lower. But liqueurs are a trap: options like amaretto and sambuca pack 15 or more grams of carbs in a single shot, and even “lighter” liqueurs like Irish cream contain around 10 grams.
Fitting Red Wine Into a Low-Carb or Keto Diet
Most ketogenic diets aim for around 20 grams of net carbs per day. A single glass of dry red wine at 3.5 to 4 grams takes up roughly 15 to 20 percent of that daily budget, which is meaningful but workable if you plan around it. Pinot Noir is the go-to choice for keeping the number as low as possible.
Two glasses, however, can eat up a third or more of your daily carb allowance, leaving very little room for vegetables and other whole foods. If you’re strictly tracking, one glass is the practical ceiling on most days. Avoid sweet reds entirely on keto, since a single glass of something like Port could use up half your carb limit on its own.
What Red Wine Does to Blood Sugar
Red wine has a glycemic index between roughly 30 and 50, which is low. That means the small amount of sugar it contains enters your bloodstream gradually rather than causing a sharp spike. Red wine tends to sit on the lower end of that range compared to other alcoholic beverages.
There’s also some evidence that compounds naturally present in red wine, particularly polyphenols, may help improve insulin sensitivity when consumed in moderation. This could partially explain why moderate red wine consumption doesn’t seem to cause the blood sugar disruptions you might expect from other alcoholic drinks.
Why Carbs Aren’t the Whole Picture
Even though a glass of dry red wine is low in carbs, it still contains about 120 to 125 calories, mostly from the alcohol itself. Alcohol carries 7 calories per gram, nearly as calorie-dense as fat. And your body treats alcohol as a priority fuel source, meaning it processes the alcohol before it gets back to burning fat or carbohydrates from food. This temporary pause in fat burning is the reason alcohol can slow weight loss progress even when the carb count looks fine on paper.
One other thing worth knowing: wine bottles in the U.S. are not required to list nutritional information. Calorie counts, carb grams, and sugar content are all optional under current federal labeling rules. That’s why you rarely see a nutrition facts panel on a bottle of wine, and why most people have no idea what they’re actually consuming per glass.