Hi Brewers Friend Team -- I've been converting several of my recipes into Brewers Friend and I have noticed that the calculated original gravities seem to been off. After looking into it further, I noticed that the PPG for several base malts seem to be much higher than what I would expect so I dug even deeper and after calculating the PPG values from the values found either on the maltster's website or the distributor's website the values in Brewers Friend seem to be higher than what I calculated. I'm curious if these values are maintained in any way or what the original source was that might explain the differences.
As an example;
Bestmalz Pilsner Malt
Brewers Friend PPG = 37
Calculated PPG using numbers from Best Malz Website = 34
Calculation is as follows;
PPG = 46 * Extract Course Grind, As Is / 100
Extract Course Grind, As Is = Extract Course Grind, Dry Basis * (1 - Moisture Content)
Extract Course Grind, Dry Basis = Extract Fine Grind, Dry Basis - Fine-Course Difference
For BestMalz Pilsner Malt, the typical values are;
Extract Fine Grind, Dry Basis = 80.5
Fine-Course Difference = 2
Moisture Content = 0.049
So using the formula's above;
Extract Course Grind, Dry Basis = 80.5 - 2 = 78.5
Extract Course Grind, As Is = 78.5 * (1 - 0.049) = 74.7
PPG = 46 * 74.7 / 100 = 34.3
Out of the 4 malts that I examined, the BF PPG numbers all seem to be higher than the calculated PPG. This includes Bestmalz Best Pils, Franco-Belges - Pilsen Malt, Bestmalz Vienna and Briess Pilsner Malt.
As an example;
Bestmalz Pilsner Malt
Brewers Friend PPG = 37
Calculated PPG using numbers from Best Malz Website = 34
Calculation is as follows;
PPG = 46 * Extract Course Grind, As Is / 100
Extract Course Grind, As Is = Extract Course Grind, Dry Basis * (1 - Moisture Content)
Extract Course Grind, Dry Basis = Extract Fine Grind, Dry Basis - Fine-Course Difference
For BestMalz Pilsner Malt, the typical values are;
Extract Fine Grind, Dry Basis = 80.5
Fine-Course Difference = 2
Moisture Content = 0.049
So using the formula's above;
Extract Course Grind, Dry Basis = 80.5 - 2 = 78.5
Extract Course Grind, As Is = 78.5 * (1 - 0.049) = 74.7
PPG = 46 * 74.7 / 100 = 34.3
Out of the 4 malts that I examined, the BF PPG numbers all seem to be higher than the calculated PPG. This includes Bestmalz Best Pils, Franco-Belges - Pilsen Malt, Bestmalz Vienna and Briess Pilsner Malt.