calculating efficiency - Home Brew Forums
Register Now For Free!

 Home Brew Forums > calculating efficiency

08-14-2012, 05:53 PM   #1
ninkasi2012
Recipes

Jul 2012
toronto, ontario
Posts: 51

Just wondering when you calculate efficiency do you use your pre-boil volume or final boil volume?
my pre-boil volume is 5.75G but after I boil I'm aiming for 5. So not sure when I divide by 5.75 or 5?! I normally take a reading soon after mashing.

thanks in advance for everyone's help!

08-14-2012, 06:10 PM   #2
TopherM

Recipes

Mar 2011
St. Petersburg, FL
Posts: 3,974
Liked 450 Times on 355 Posts

http://www.howtobrew.com/section2/chapter12-5.html/

I personally just pop my numbers into BeerSmith and it calculates everything for me.
__________________
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!

08-14-2012, 06:15 PM   #3
bdh
Recipes

Feb 2012
Baltimore, MD
Posts: 171
Liked 19 Times on 9 Posts

You can do either - just use the volume that's there when you take the gravity reading. As a simple example, say you have:

10 lbs 37ppg grain
1 lb 34ppg grain

You can use the equation:

gravity = efficiency * (10*37 + 1*34)/volume

Where gravity here is the last two digits of the gravity reading (i.e. 1.0xx).

So say you get 75% efficiency, then if you measure the gravity pre-boil (with a volume of 5.75gal) you should get a gravity of 0.75*(404)/5.75 = 53

If you measure gravity post-boil (with a volume of 5gal) you should get 61 (1.061 on the hydrometer).

 Thread Tools

 Similar Threads Thread Thread Starter Forum Replies Last Post exe Beginners Beer Brewing Forum 22 12-22-2011 07:09 PM RootDownBrewing Beginners Beer Brewing Forum 1 08-21-2011 12:33 PM daveooph131 Beginners Beer Brewing Forum 2 01-15-2010 01:11 AM dmbnpj Beginners Beer Brewing Forum 11 09-28-2009 01:58 AM taydawg197 Beginners Beer Brewing Forum 3 08-13-2007 03:50 PM

 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Sponsor Showcase     Sponsor Showcase Home Brewing Beer     Beginners Beer Brewing Forum     General Beer Discussion     Fermentation & Yeast     All Grain & Partial Mash Brewing     BIAB Brewing     Extract Brewing     Gluten Free Brewing     General Techniques     Recipes/Ingredients     Equipment/Sanitation     Electric Brewing     Automated Brewing Forum     DIY Projects         Kegerators & Keezers         Brew Stands         Cleaners & Cleaning         Chillers & Stir Plates         Kettles, Mash Tuns & Hot Liquor Tanks         Fermenters     Bottling/Kegging     Label Display & Discussion     Brew Science     Lambic & Wild Brewing     Hops Growing     Home Brewing Photo Forum     Brewing Software Wine, Mead, Cider, Sake & Soda     Winemaking Forum     Mead Forum     Cider Forum     Soda Making     Kombucha & Fermented Tea Forum HomeBrewTalk.com Recipe Database     Homebrew Lager Recipes     Homebrew Ale Recipes     Homebrew Sours & Wilds Recipes     Specialty, Fruit, Historical, Other Homebrew Recipes     Mead Recipes     Wine Recipes     Cider Recipes Home Brew Market     Sampling and Critiquing and Beer Swapping     For Sale     Want to Buy     Group Buys     Homebrew Crowdfunding Food and Beverage     Cheese Making Forum     Cooking & Pairing     Coffee Brewing & Roasting     Meat Smoking, Curing and Sausage Making Home Brewing Community     General Chit Chat     Drunken Ramblings and Mindless Mumbling     Commercial Brew Discussion     Beer Blogs & Articles     Company Reviews Brewing Events & Local Gatherings     North West Homebrew Forum     South West Homebrew Forum     Great Lakes Homebrew Forum     South East Homebrew Forum     North East Homebrew Forum     North Central Homebrew Forum     South Central Homebrew Forum     International