# Efficency calculation correct ?

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#### chillhuman

##### Member
I brewed a batch of beer today, which was 9#4oz British 2row and 12oz 120L crystal malt. I ended up w/ an OG of 1.060. When I did some quick calculations, it looks to me like there is a possible total of 35.5 gallon points theoretical max, where as I ended up with 33 gallon points. This would be an efficiency of over 90%, which I tend to believe is NOT what I'm getting. I set the crush on my barley crusher 1/4 turn tighter, which made for a much finer crush, but the sparge took too long for what I want to spend on a batch. In any case, is my math correct here?

The one piece of the equation you left out is the volume of the liquid in which you took this sample from. Was it post sparge or post boil?

Post boil. Went from 6.5 gal -> 5.5 gal over 90min

chillhuman said:
I brewed a batch of beer today, which was 9#4oz British 2row and 12oz 120L crystal malt. I ended up w/ an OG of 1.060. When I did some quick calculations, it looks to me like there is a possible total of 35.5 gallon points theoretical max, where as I ended up with 33 gallon points. This would be an efficiency of over 90%, which I tend to believe is NOT what I'm getting. I set the crush on my barley crusher 1/4 turn tighter, which made for a much finer crush, but the sparge took too long for what I want to spend on a batch. In any case, is my math correct here?

Here are my calculations (which may or may not be right):

Max Extraction
9.25 lbs 2-row (max ppg 38) = 351.5
.75 lbs 120l crystal (max ppg 33) = 24.75

351.5 / 5.5 = 63.91
24.75 / 5.5 = 4.5
Total = 68.41 ppg

1.060 at 5.5 --> 60

60 / 68.41 = 87.7%

BTP is giving me 91.48% with an assumption that the English 2-row is MO at 36ppg.

explosivebeer said:
Here are my calculations (which may or may not be right):

Max Extraction
9.25 lbs 2-row (max ppg 38) = 351.5
.75 lbs 120l crystal (max ppg 33) = 24.75

351.5 / 5.5 = 63.91
24.75 / 5.5 = 4.5
Total = 68.41 ppg

1.060 at 5.5 --> 60

60 / 68.41 = 87.7%
That's about what I got too. I think I used slightly different theoretical max values, which is why I was showing 91%. That's awesome then. It was a long wait for the sparge, but hitting upwards of 85% in eff. is great! Thanks for the numbers. Having another calculation to double check against really helps.

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