![]() With a modern design that is easy to use. ![]() Keep track of all the details in your batches and your ingredients inventory.īrewfather is made from the ground up to give you the best recipe design and brewing experience on both desktop and mobile devices. Thank you for joining me on the BeerSmith Home Brewing Blog.Powerful and easy to use tool for your brewing needs. Please join us next week for part two of this article, where we explore real attenuation, and also how to make proper use of attenuation when designing your own beer recipes. Now you know enough to be dangerous at dinner parties. Where Real_extract, Original_extract (which is just your OG) and Apparent_extract (your FG) are all in degrees plato. Real_extract = 0.188 * Original_extract + 0.8192 * Apparent_extract Real extract can be calculated from the starting gravity and apparent extract (final gravity) as follows: Real extract (often written as RE) is the real extract content of the finished beer, accounting for the actual alcohol content and imperfect nature of hydrometers. If you want an exact calculation you can use a tool like BeerSmith or an online converter. To do a rough Plato calculation in your head, one degree plato is approximately 4 points of specific gravity, so a finished beer with a specific gravity of 1.012 (1.012 is “12” points) is approximately 3 degrees plato. For a homebrewer, this is the same as your final gravity (FG), but convert it from a specific gravity to degrees plato if you want to sound like the pros. Therefore, a hydrometer reading taken on finished beer will show lower (less extract content) than the beer actually contains.Īpparent extract (often written as AE) is the measured hydrometer reading for the finished beer, usually expressed in degrees plato by professional brewers. Finished beer, however, contains alcohol (ethanol) which skews the hydrometer reading because alcohol is less dense than water. However, hydrometers are calibrated to measure the sugar content of a solution of water. The gravity of beer is most often measured using hydrometers. What is Apparent Extract and Real Extract? So for this example, 80% of the available extract in the wort fermented to become alcohol and CO2. So if you have a beer with an original gravity of 1.050 and it finishes with a gravity of 1.010, the math works out to be 100*(1.050-1.010)/(1.050 – 1.000) which is exactly 80%. Where OG is your original gravity and FG is your final gravity. Apparent attenuation is very easy to calculate as follows:Īpparent_Attenuation_in_% = 100 * (OG – FG)/(OG – 1.0) That portion of the sugar, expressed as a percentage, is the attenuation of the beer. During fermentation a portion of the sugary wort is converted to alcohol (primarily ethanol). You boil the sugary wort, cool it, add some yeast, and fermentation starts. If you are an extract brewer, then you just start with sugary wort syrup. Recall that the basic brewing process for all grain starts with the mashing process, which converts your barley grain into sugary wort. Here’s how to tell if he really knows what he’s talking about:Īttenuation is nothing more than the percentage of the original extract that has been converted via fermentation to CO2 and alcohol (and a few lesser compounds like esters in small quantities). ![]() So you are at a party looking to impress the non-brewing muggles, but instead a brewing geek comes up and starts talking about original extracts, apparent extracts, and ABVs. So in this two part series on the BeerSmith blog we take a look at beer attenuation in all of its various forms, and how you can use it in recipe design. Follow is a term often thrown around by home brewers at parties to impress non-brewers, but understanding the different forms of real and apparent extract and attenuation can help beginning and advanced home brewers alike. ![]()
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