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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Divide preboil gravity by estimated preboil gravity?
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Old 07-11-2011, 06:52 PM   #1
triangulum33
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Default Divide preboil gravity by estimated preboil gravity?

Can I divide my measured preboil gravity by the estimated preboil gravity to get brewhouse efficiency?
Estimated gravity calculated by iBrewmaster on my iPad.


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Old 07-11-2011, 09:08 PM   #2
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No, because the estimated preboil gravity is presumably also being calculated with reference to a predicted efficiency. But, assuming your volumes are all correct, you can do:

( (actual preboil gravity) / (predicted preboil gravity) ) * (predicted efficiency) = actual efficiency
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