How many calories are there in a glass of white wine?

A 4-ounce glass of white wine has about 100 calories, according to About.com. In general, 1 ounce has 25 calories, but white wines that are sweet or designed for desserts may have higher caloric counts.

When they serve their own wine, it is not unusual for people to pour more than 4 ounces. If they pour a 5-ounce glass of white wine, the calorie count is about 125. It is about 150 for a 6-ounce glass of white wine. Restaurant servers may also pour more than 4 ounces. Data from the United States Department of Agriculture shows 165 calories in a 3.5-ounce glass of sweet dessert wine.