Does 100 proof whiskey have more calories than 80 whiskey?

Proof is a measure of alcohol content.

100 proof means the alcohol content is 50%.

80 proof means the alcohol content is 40%.

Alcohol has 7 calories per gram.

So 100 proof whiskey has more calories than 80 proof whiskey.

1 ounce of 100 proof whiskey has 64 calories.

1 ounce of 80 proof whiskey has 48 calories.

Therefore 100 proof whiskey has more calories than 80 proof whiskey.