Why is my efficiency so low? Can someone explain my efficiency? I thought I understood efficiency. These statements are just some examples of the many threads relating to efficiency that I have seen on HomeBrewTalk. It would seem the forum is replete with individuals scratching their noodles in an effort to solve a conundrum their brewing data has presented. Fortunately, there are many helpful members who are ready, willing, and able to crunch the numbers, point out possible errors, and in many instances solve the riddle. The purpose of this article is not to explore brewing-science's formulae and mathematics, but to illustrate some simple steps involved in the collection and interpretation of useful brewing data. Many homebrewers, myself included, use brewing software to crunch the numbers and calculate efficiencies. Through accurate data collection and analysis, brewers can more easily localize problems with their equipment or methods and find effective solutions. Lets look at...