This beer recipe calculator is capable of doing numerous brewing conversions on the fly! It is made with a heavy and durable paper, is coated for water-resistance, and is able to crunch tall gravity conversions in a single slide! Other features include a Recipe Volume-to-Bitterness chart, A Boil Time-to -Boil Gravity chart, and a chart to tell you the gravity contribution of DME, Base Malt, and Specialty grains, just to name a few. A great tool for making quick adjustments during your brew or for when the zombies come.