Api gravity calculator

The % utilization I'm referring to the is one found using the Tinseth table (it's a function of gravity and boil time), not the overall +10% for using pellet hops. If my pre-boil were 1.084, and my post boil was 1.114, then my average boil gravity would be 1.099. If I plug that into the online calculator, I get 51 IBUs. This is over 10 IBUs off from what BeerSmith is claiming the IBUs to be using the same formulas. #8 I see Wort specific gravity, not average gravity during the boil. Typically, I would interpret this to mean the starting gravity of the boil. With Glenn's on-line calculator, I do not know what the boil off rate is, so I don't know how he is figuring the initial volume of the boil but this could explain the difference between the 58 of the on-line calculator and 63 figured by BeerSmith.When looking at the table, the utilization rate of the AAs is based upon the gravity of the wort WHEN the hops are added. His calculation takes into account the changing gravity during the boil. It seems to me that you are trying to do some of the calculation yourself when entering the numbers by predetermining the midpoint of the gravity during the boil, which the calculator interprets as being the starting pre-boil gravity. #9 Oginme said: I see Wort specific gravity, not average gravity during the boil. Typically, I would interpret this to mean the starting gravity of the boil. With Glenn's on-line calculator, I do not know what the boil off rate is, so I don't know how he is figuring the initial volume of the boil but this could explain the difference between the 58 of the on-line calculator and 63 figured by BeerSmith.When looking at the table, the utilization rate of the AAs is based upon the gravity of the wort WHEN the hops are added. His calculation takes into account the changing gravity during the boil. It seems to me that you are trying to do some of the calculation yourself when entering the numbers by predetermining the midpoint of the gravity during the boil, which the calculator interprets as being the starting pre-boil gravity. Now we're talking!I'm assuming Glenn's calculator works as he describes in If so, then the boil gravity refers to the average gravity of the boil: Use an average gravity value

Screwy Calc (at right) uses the Original Gravity (OG) and Final Gravity (FG) temperatures to calculate the residual CO2 volumes of your beer. Specific gravity temperature corrections are also applied to calculations of calories, carbohydrates, attentuation, extract, Plato and yeast pitching rates. Yeast pitching rates are calculated in billons of cells. The formula uses adjusted final gravity Plato and wort size in gallons to determine how much yeast should pitched for either Ale and Lager type beers.Screwy's Brewing Calculators Alcohol Content Calculator American/Metric Calculator Batch Bottle Sizing Calculator Bottle Priming Calculator Cylinder Volume Calculator ezBIAB Calculator© ezBrewingWater-RO© Force Carbonation Calculator Grain Bill Percentage Calculator Hop Bitterness Calculator Hop Bitterness, Flavor And Aroma Chart Hop Bitterness Balance Calculator Mash Water Volume Calculator Rest Temperature Calculator Standard Reference Method Color Chart Strike Temperature Calculator qBrew - Homebrewers Recipe Calculator This free beer recipe calculator is intuitive, easy to install and fun to use.Use it to automatically calculate the gravity, color and bitterness of your own recipes.Download it today and also get Screwy's database including the latest Mr. Beer ingredients. qBrew - Homebrewers Recipe CalculatorAlcohol Content Enter the full specific gravity (SG) readings including the decimal point and the percentage of alcohol will be calculated when you click on the submit button.(Example: 1.050)(OG) - Original GravityThe first reading is of the beer in your fermenter, before you start the fermentation process. Take this reading when all the water has been added and you are ready to pitch the yeast. Pour a sample out of the tap into a test flask and set it aside to cool to about 70F (20C).(FG) - Final GravityThe second reading is of the finished beer. This is taken when you are ready to bottle your beer and this too should be about 70F (20C).Residual CO2 A certain amount of Residual CO2 remains in the beer after the fermentation has completed, depending on the fermentation temperature. An ale fermented at 65°F will have 0.9 volumes of residual CO2 while a lager fermented at 50°F will have 1.2 volumes. To get the same carbonation in these two beers would require

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For the entire boil to account for changes in the wort volume. It appears that BeerSmith (and some other online tools) are using the pre-boil gravity rather than average gravity in its calculation, which I would argue is applying the Tinseth method incorrectly. Given that [IBUs = (mg of AA)/L] and my example above for Beersmith:11 gallons = 41.64L63.5 * 41.64 = 2644.14mg of AA or 2.64 g of AAsince [(AA in g)=(g of hops)*(AA%)*(Util%)], we solve for Util% and get [Util%=(g of AA)/(g of hops)/(AA%)]:2.64 / 141.748 / .1 = .186 or 18.6% utilizationBeerSmith bumps the utilization by 10% if using pellet (which I am). To make sure I'm comparing apples to apples, I remove that 10% from 18.6% which gives us 16.9% utilization. Still far from Glenn's tool which predicts a 15% utilization (assuming an average boil gravity of 1.099).I understand exactly how Glenn's tool works because he describes the math in the link I pasted above. No where in BeerSmith or online can I find out how BeerSmith is coming up with it's utilization numbers.Should I send an email to Brad? #10 I moved this to a more appropriate thread: #11 BeerSmith and other calculators can use the original gravity because they also calculate the final gravity and therefore can calculate the average gravity. I will have to go back through my podcasts, but I am fairly sure that in his final calculator, Glenn used the pre-boil gravity and a typical boil off rate to calculate the wort gravity at the time of hop addition. #12 I plugged in his formulas into a spreadsheet and compared the utilization with that of his calculator and they line up. I'm willing to be he's using the same formula in his calculator and the gravity is the "average" gravity.I'd be interested in a link to the podcast you're referring to.

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