Varieties of red wine include shiraz, cabernet, merlot, sangiovese and chianti. Many wines have mixes of more than one grape variety, which affects the caloric value. Even the same wine variety has different nutritional information when made by two different winemakers.
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The US Department of Agriculture Nutrient Database lists the nutritional information for individual varieties of wine and for generic red wine. On average, there are 125 calories in a 5 oz. glass of generic red wine. The calories consist of less than 1 g. of protein, 4 g. of carbohydrates and 15 g. of alcohol.
The calories in a 5 oz. glass of red wine varies depending on the brand and the variety. A glass of merlot contains 122, while pinot noir has 121 calories. Cabernet sauvignon is about the same at 122 calories, while an average zinfandel has 129 calories per 5 oz. glass.
The calories in red and white wine do not differ much. The US Department of Agriculture lists a generic white wine as having 121 calories per 5 oz. serving. The calories consist of less than 1 g. of protein, 4 g. of carbohydrates and 15 g. of alcohol.