Scotch, Whiskey, Bourbon, and Rye Calories. All forms of whiskey have about the same number of calories. Most whiskey is 80 proof, and contains about 64 calories per ounce (30 ml). That’s 97 calories in a typical 1.5 ounce (44 ml) serving size. But higher proof whiskey does have more calories, as you can see in the calories chart.