5 gallon boil to 2.5 gallon boil recipe conversion?

[balzern]

Hey everyone,

I am pretty sure I made these recipes assuming a 5 gallon boil when I am going to do a 2.5 gallon boil then top off the fermenter to 5 gallons with cold water. I know, I know it was a careless mistake but I am brewing soon, have all the ingredients and am kinda freaking out . I was wondering if you guys could look at this and help me adjust my numbers (if I need to).

The first recipe is a Robust Porter:

(Steeping Grains)
12 oz Simpsons Dark Crystal
5 oz Simpsons Black
5 oz Simpsons Chocolate

7# Light DME
1.75 oz Progress (60 min)
3 oz East Kent (10 min)



The Second Recipe is a Dunkelweizen:

2# Munich
6 oz Chocolate Rye
4 oz Carafa III

6# Wheat LME

1 oz Hallertauer (60 min)


Thank you so much, I appreciate it.

 

[vitrael]

The first step is to relax.

Your hop utilization will go down. If you have extra hops for your bittering variety, you can add more to compensate for this. Use an IBU calculator to help you.

What is the estimated starting gravity for these recipes? If you are boiling 2.5G of water, your wort gravity will be about twice the estimated SG, considering you are using extract. It will actually be a little more due to boil-off by the end. Higher wort gravity = lower hop utilization. You can make the conversion from there.

If you don't have extra hops, then your beer won't be as bitter. Not a deal breaker on a Robust Porter if you ask me.

 

[lweisenb]

You can throw your recipe into beersmith and have it do the calculation, they have a 3 week free trial on their website. The only change should be the amount of hops.

 

[balzern]

I have a mac and beersmith won't download...The SG was about 1.054-1.056 for both beers - I can't remember because I was using hopville beer calculus and for some reason it won't load today

 

[balzern]

In beersmith it says that the Porter will have an est. Original Gravity of 1.062 est FG of 1.019....28.7 IBU and 30.7 SRM

The Dunkelweizen 1.046 OG - 1.011 FG ....21.2 SRM ...11.4 IBU

I entered the Batch size for each as 5 gallons and the boil size as 2.5 is this right?...I was a bit confused on how to enter how long I plan on boiling my extracts (60 minutes for both recipes)...actually I didn't really have to change my recipes much aside from adjusting the carafa III in the dunkelweizen to .15 lbs. Did I do this correctly?

 

[balzern]

anyone want to double check this please?

 

[balzern]

friendly nervous bump