OG Question

[Timsta]

So I'm new to the game... my first kit batch turned out well. And now that I'm finished moving I'm ready to get back at it. I was just looking around at clone recipes, Weeping Radish's Black Radish for one. My roommate, a local bartender, yelled out to see if I could make Harpoon's Leviathan... I'm pretty sure I'm not ready for that one but it brought me to my question.

I assumed that most Imperial IPA's would have an original gravity of 1.075 and up, but when I check Harpoon's website they have the Original Gravity listed at 22. I was curious as to what I was missing here, or is it as simple as being 1.022?

Thanks for any help

 

[SilverZero]

It's probably listed in degrees Plato, and at 22 Plato that would equate to 1.092 OG, which would make sense for a 10% ABV. (I should try that, I love me some IPA!) And that, in turn, means the FG would probably be 1.017, which is 4.33 Plato.

A rough estimate is 1 degree Plato for every 4 SG points (where 1.025 would be 25 points SG, for example), but that obviously comes up a bit short if you did the 22P conversion, mainly because getting up that high is where the actual and the estimate start to deviate more significantly. Up until about 1.050 the estimate will be fairly spot on, and even up at higher OGs you're gradually getting further off but still within 5 points until you hit 100 (or 1.100, at almost 24 degrees Plato). (See this for a little tutorial in that wise.)

The full conversion is more complicated, but it's listed as precisely as I've found at the top of this page.

I've edited this post a dozen times already to add and revise info, which shows how dangerously involved I am liable to become with this sort of thing.

 

[Timsta]

Ahhh, got it. Hmm... I still have some figuring to do. I'm messing around on Beer Calculus to see if I can get something similar... So far I've gotten the EBC and ABV to match Harpoon's website. However, I have my OG at 1.099