I brewed my first batch of beer last weekend and want to know the alcohol content of my beer when it's time to bottle. When brewing however, I make a rookie mistake: I forgot to measure the OG before pouring my wart into my fermenter. Is there a way to know my alcohol content? I'm still trying to understand the science part of the brewing process and the hydrometer part confuses me a bit. Some advice on the importance of what this tool can do for me would be nice too.
If it is an extract recipe, the OG is somewhat predictable, if you know your post-boil volume. Use a recipe calculator to make an estimate. Or print your recipe here. The hydrometer essentially responds to the density of the wort and beer, which is dependent to a large degree on the sugar content. You use a hydrometer to evaluate your starting and final sugar content and you can estimate how much sugar was converted into alcohol. More or less. It is only essential if you use this sort of information to inform your brewing or to impress your guests while sipping your beer. In fact, nothing thrills your guests more than a numerical demonstration of beer knowledge, complete with OG, FG, ABV, and IBU. +10 points if you convert specific gravity to degrees plato.
Dont worry about it so much this time. Don't forget your gravity readings next time if you really want to know. Ask yourself why it is really so important. Good beer is good beer, no matter the alcohol content.
The specs on your recipe will frequently include the expected OG and FG, so take a look there. But the 'expected' amounts are only in consideration if you did everything perfect to the recipe's instructions. The biggest variable (mistake) that can throw off the expected OG/FG number is the amount of liquid that you sent to your fermentor. If you ended up with too much liquid per the recipe's gallon amount because you added too much water, your OG (if you had taken it with your hydrometer) will be lower than expected because you have a watered-down wort. If your liquid amount is less than what is called for by the recipe, then your OG will be too high because you have a concentrated wort. So for a 5-gallon recipe, it's very important to hit that volume amount as close as possible or you'll throw off the numbers, and to some extent, you'll also throw off the taste of your beer too. Using a hydrometer is not difficult, and involves taking a sample under sanitized equipment and conditions and placing the hydrometer into the liquid. Some hydrometers have 2-3 printed scales in the neck of the hydrometer, so you just need to be sure to read the number scale at the liquid line where it meets the neck of the hydrometer. Read the number that shows a 1.000 near the top of the scale. You can search YouTube for videos that will help you visualize how the process occurs. Most scales are calibrated to give you the correct reading when the temp of the liquid is 60 degrees. There are conversion charts to adjust the read for the actual temp of your liquid, but I rarely concern myself with that because it is not that critical to me. A BIG consideration regarding the use of a hydrometer when homebrewing is the size of your batch. If you brew 1-gallon batches (or that can also apply to 2-gallons) you typically have to take so many samples for the OG and FG readings that you'll have very little beer left at the end. For small batches you need to consider alternative ways to complete the brewing process if you'd like to bottle more than 5-6 beers. One last thing to mention regarding hydrometers: all experienced brewers will keep a spare on hand. Those things are easily broken, so if these readings are important to you, have a spare hydrometer hanging around.
polycarbonate...good news...I've been buying them by 2s... MomGoose, It's a blog, not a novel... Estimate your ABV and move on...
I would say that it's pretty important to measure gravity. Measuring your gravity, especially when new at brewing, allows you to determine your brew house efficiency. This allows for adjustments on all future batches/recipes. Also allows you to determine if you attenuated your beer enough for the given style. I'm saying all of this in general. Not aiming it at you by the way. More for the benefit of a new brewer.
I agree, it is important. My point was just that the ship has sailed for the OP this time. Since he can't turn back the clock not to worry about it this time and learn a lesson for next time
Only bought a hydrometer recently because people harp about readings here so much. Needless to say my puppy helped make that "bought one" into "bought three". I will buy up these for when the dog strikes again.
I was also suggesting you don't really need the hydrometer. I suggested it is useful to inform your own brewing, and this is what I was getting at. It will help you develop predictability in your brewhouse. If you don't use one, you would have to rely on your sensory perceptions to develop a sense of predictability. It might take a little longer to develop that predictability, but if you know that 10 lbs of grain in your systems makes an avergish strength pale ale, you might be able to project what 12 lbs does, 14 lbs, etc., but just not in precise terms like ABV.
I can't imagine getting into homebrewing without a hydrometer, but I have some antique instructions from a prohibition brewer (God rest her soul), that never mentions a hydrometer (or sanitizer for that matter)...cheers.
