When it comes to beer, people have many diverse tastes. Some prefer their beer on all different possible points on the flavor spectrum, from fruitiness, to hoppiness, to all the other myriad classifications that go into a glass of beer.
But for those who prefer their beer bitter, you’re in luck. Because there’s an actual scientific/mathematical measure for determining beer bitterness. It’s called the IBU scale, which stands for “International Bittering Units.” It’s measured by way of a spectrophotometer, and it determines just how bitter your beer really is. So click on through for the 9 bitterest beers out there according to their IBUs.