There are many types of wine, including reds and whites. Within each type exist many varieties, such as the Merlot and Cabernet reds and the Riesling and Chardonnay whites.
On average, red wine contains slightly more calories than white wines. The U.S. Department of Agriculture food database lists the caloric content of 4 ounces of red wine as 100 calories. There are 3 grams of carbohydrates in 4 ounces. For the Cabernet Sauvignon variety, the USDA states there are 96 calories and 3 carbohydrates per 4 ounces. Pinot Noir also has 96 calories and has 2 grams of carbohydrates, and the Merlot variety has 98 calories, with 3 carbohydrates.
The USDA lists the caloric content of white wine as 96 calories per 4 ounces. There are 3 grams of carbohydrates. The Pinot Grigio variety has 97 calories and 2.4 carbohydrates per 4 ounces. Riesling white wine has fewer calories at 95, but more carbohydrates, 4.4 per 4 ounces.
A standard pour for a glass of wine is 5 ounces, not 4 ounces. Unless measured, a pour is subjective; it could be slightly more or less than a standard amount. The same variety of wine will have different nutritional content when produced by two different wineries. The nutritional content of one brand of Pinot Noir may vary slightly from another brand's Pinot Noir.