Coldbreak Brewing Giveaway - Open to All!

Home Brew Forums > Home Brewing Beer > General Techniques > Calculating the specific gravity of a blend
Reply
 
Thread Tools
Old 03-04-2014, 08:40 PM   #1
austinb
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2007
Location: Portland, OR
Posts: 247
Liked 12 Times on 10 Posts
Likes Given: 1

Default Calculating the specific gravity of a blend

So I am trying to make a starter for brewing Thursday but the yeast smack pack I got was about 90 days old so the viability from the brewers friend calculator is only 37% or 37 billion cells. Using the Brewers friend calculator I found that I could get a proper pitch for the 10 gallon batch if I did 2 steps the first one a 1L starter on the stir plate with an OG of 1.030 (which I have already started) and then a 2L starter at 1.040. The problem is I don't have enough time to crash cool between starters before the brew day so I was thinking tomorrow I could just add another 1L of a stronger wort to get to approximately 1.040. I was thinking the current 1L starter is just pale malt and should end up somewhere around 1.010 so if I add another liter of 1.070 wort I will end up at 1.040. Here is the math 1.010+1.070=2.080/2=1.040, since they are both the same volume that does not need to be calculated. Is this correct or is the formula for calculating the specific gravity of a blend more complicated than that? I know this isn't going to be exact but I'm just trying to get somewhere close to a proper pitch rate. Thanks.


austinb is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculating how much sugar is in 0.001 SG of a specific volume of beer ocluke Brew Science 2 01-26-2013 01:09 PM
Calculating ABV of Blend OBSCZONER Lambic & Wild Brewing 2 12-10-2012 09:28 PM
low specific gravity themashedone Beginners Beer Brewing Forum 2 12-24-2010 03:29 PM
Calculating, Specific Gravity and ABV BVilleggiante Beginners Beer Brewing Forum 16 08-12-2010 04:22 PM
Specific Gravity? Target Gravity? HalloweenGod General Techniques 6 01-03-2009 07:30 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS