This is the Calculated Bittering Units measured by Smart Brewer. Unlike the the IBU entered by the user (IBU) the Calculated IBU is determined mathematically based on the type of hops, the form of hops (Pellet, Plug, or Leaf), the Alpha Acid Unit of each hop (AAU), the length each hop is boiled and total estimated Original Gravity of each recipe. This calculation is purely a ballpark figure of the "approximate" IBUs in a given recipe.
Where:
B = Bitterness for each hop
W = weight of hops used in ounces
A = the weight percentage of alpha acids in the hops
U = the percent utilization of alpha acids
V = the volume of wort
G = the specific gravity of the wort

This is the calculated color of a beer based on the fermentables in a recipe.

Where:
MCU = Malt Color Units
SRM = Standard Reference Method
SRM Number Derived From:

Note: Morey's Law is used by Smart Brewer

This is the "Calculated Original Gravity" measured by Smart Brewer. The Calculated OG is based on the fermentables of the recipe and the final size of the recipe independent of the Brewer's Original Gravity to the left. Each fermentable has a different potential gravity. Additionally, the "Calculated Original Gravity" is determined purely by math. The size of the final batch, the efficiency of a given brew system and the potential gravity per gallon for each fermentable (referred to as "potential" or ppg) all contribute to the Calculated Specific gravity.

Note: Smart Brewer grabs the potential from each fermentable in a recipe, calculates the weight of the fermentable compared to the total weight of all the fermentables, compares the size of the batch and factors in the efficiency to produce this number.

The Smart Brewer Efficiency estimates the needed efficiency to achieve the Original Gravity for a given recipe. Smart Brewer calculates a perfect brew (where all fermentables are converted to sugars) and compares the "Brewer's Actual OG" with "Perfect OG". The ratio of the two determines the "Smart Brewer Efficiency".