There are approximately 198 calories in a pint of Guinness. A glass of Guinness has 99 calories. Guinness is considered one of the most popular beers in the world, and is sold in more than 120 countries.
The main flavor in Guinness is roasted, unmalted barley. That gives it a slightly burnt flavor that many people enjoy. Another characteristic of this brew is the tangy flavor that is said to come from mixing aged brew with fresh brew, which was a regular occurrence in the past, but the company refuses to say if that mixture still occurs in the modern age.