### Author Topic: Brewers Friend Dllution Calculator Accurate?  (Read 1573 times)

#### jweiss206

• Assistant Brewer
• Posts: 109
##### Brewers Friend Dllution Calculator Accurate?
« on: February 18, 2016, 05:02:33 pm »
So I'm brewing an 8.5 gallon batch meant for refilling my 8 gallon whiskey barrel. I don't think I have the time to brew back to back 4.5 gallonish' batches (my system can't handle a batch this big with my desired 1.075 OG). I therefore am thinking of brewing a really big 5 gallon batch and diluting it down to the desired OG. Does anyone have experience using Brewers friend dilution calculator? I definitely have had a number of hit and miss results with online brewing calcs and am curious the accuracy of this one. It says I can dilute a 1.12 gravity / 5.25 gallon batch down to 1.075 with a little over 3 gallons of water. Does that seem reasonable? I most fear over diluting it and way undershooting the OG.

Thanks dudes, you never fail me.

Jason

#### narcout

• Brewmaster General
• Posts: 2222
• Los Angeles, CA
##### Re: Brewers Friend Dllution Calculator Accurate?
« Reply #1 on: February 18, 2016, 05:29:25 pm »
No experience with that calculator, but algebra is telling me you need to add 3.15 gallons of water.
Sometimes you just can't get enough - JAMC

#### RPIScotty

• Guest
##### Brewers Friend Dllution Calculator Accurate?
« Reply #2 on: February 18, 2016, 06:56:57 pm »
No experience with that calculator, but algebra is telling me you need to add 3.15 gallons of water.

Confirmed with algebra. Second source means you can run the story!

EDIT:  V₁G₁ = V₂G₂ is always your friend when calculating volumes or gravity:

(5.25*120)/75 = 8.4
8.4-5.25 = 3.15

Viola!

Sent from my iPhone using Tapatalk
« Last Edit: February 19, 2016, 02:08:06 am by RPIScotty »

#### jweiss206

• Assistant Brewer
• Posts: 109
##### Re: Brewers Friend Dllution Calculator Accurate?
« Reply #3 on: February 19, 2016, 11:22:27 am »
No experience with that calculator, but algebra is telling me you need to add 3.15 gallons of water.

Confirmed with algebra. Second source means you can run the story!

EDIT:  V₁G₁ = V₂G₂ is always your friend when calculating volumes or gravity:

(5.25*120)/75 = 8.4
8.4-5.25 = 3.15

Viola!

Sent from my iPhone using Tapatalk

Seems legit. 3.15 pounds of water it is...I mean liters....I mean gallons.

#### euge

• I must live here
• Posts: 8017
• Ego ceruisam ad bibere cervisiam
##### Re: Brewers Friend Dllution Calculator Accurate?
« Reply #4 on: February 21, 2016, 09:07:05 am »
Fantastic! Was about to ask a question about dilution and the V₁G₁ = V₂G₂ equation certainly does the trick! Thanks I'll be attempting a "light beer" and figured dilution was the best way.
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

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