This app has four tabs for common beer brewing calculations. The first tab is a water amounts calculator that estimates mash water, water absorption, water evaporation, and sparge water for an all-grain infusion mash. The second tab is a similar water amounts calculator except that it is for an all-grain step mash. The third tab calculates International Bittering Units (IBUs) based on hop characteristics, volume of beer, boil time, and wort gravity. The fourth tab calculates carbon dioxide pressure for force carbonation of beer. Happy brewing!