Simple BIAB Calculator

HomeBrewTalk.com - Beer, Wine, Mead, & Cider Brewing Discussion Community.

Help Support Homebrew Talk:

idigg

Well-Known Member
Joined
Dec 10, 2010
Messages
391
Reaction score
12
Location
West Allis
I'm horrible at math. I can't figure this out. Say I want to start out with 7.25 gal of water in my 10.5 gal kettle, would I be able to mash 10lbs of dry grain in that kettle? I could use your excel spreadsheet Vellum :D
 
OP
mrgstiffler

mrgstiffler

Well-Known Member
Joined
May 10, 2009
Messages
1,025
Reaction score
95
Location
Newberg, OR, Cascadia
I'm horrible at math. I can't figure this out. Say I want to start out with 7.25 gal of water in my 10.5 gal kettle, would I be able to mash 10lbs of dry grain in that kettle? I could use your excel spreadsheet Vellum :D
For that, you can use the "Can I Mash It" calculator here:
http://www.rackers.org/calcs.shtml
 
OP
mrgstiffler

mrgstiffler

Well-Known Member
Joined
May 10, 2009
Messages
1,025
Reaction score
95
Location
Newberg, OR, Cascadia
Isn't that calculator for typical sparge style scenarios? What would I put for mash thickness if I'm doing a no sparge BIAB?
It's for strike water and grains. You said that you want to have 7.25 gallons of strike water and 10lb of grain. That's 29 quarts of water to 10lb of grain. 29/10 = 2.9 mash thickness. That calculates out to just over 8 gallons of space.
 

55chevydude

Active Member
Joined
May 4, 2009
Messages
32
Reaction score
0
Location
New York
Ok, so I am tackling Pliny the Elder in a few weeks. Massive hop bill on this one. I would like to try out BIAB style with it. I have a question though based on Vinnie's recipe:

Ingredients For 6.0 gallons (22.7 L) [Net: 5 gallons (18.9 L) after hop loss]
13.25 lb (6.01 kg) Two-Row pale malt
0.6 lb (272 g) Crystal 45 malt
0.6 lb (272 g) Carapils (Dextrin) Malt

So thats the basic grains. Later he says to collect 8 gallons of runoff and begin the 90-minute boil. Using the Simple BIAB Calculator , however, it tells me I should be starting my boil with 6.07 gallons. Thats a huge difference. Anyone have an idea of which is correct for BIAB? I have access to a commercial kitchen and will be using their jacketed steam kettle which produces significant boiloff.
 
OP
mrgstiffler

mrgstiffler

Well-Known Member
Joined
May 10, 2009
Messages
1,025
Reaction score
95
Location
Newberg, OR, Cascadia
Ok, so I am tackling Pliny the Elder in a few weeks. Massive hop bill on this one. I would like to try out BIAB style with it. I have a question though based on Vinnie's recipe:

Ingredients For 6.0 gallons (22.7 L) [Net: 5 gallons (18.9 L) after hop loss]
13.25 lb (6.01 kg) Two-Row pale malt
0.6 lb (272 g) Crystal 45 malt
0.6 lb (272 g) Carapils (Dextrin) Malt

So thats the basic grains. Later he says to collect 8 gallons of runoff and begin the 90-minute boil. Using the Simple BIAB Calculator , however, it tells me I should be starting my boil with 6.07 gallons. Thats a huge difference. Anyone have an idea of which is correct for BIAB? I have access to a commercial kitchen and will be using their jacketed steam kettle which produces significant boiloff.
Do you know the boiloff rate of the setup?
 

55chevydude

Active Member
Joined
May 4, 2009
Messages
32
Reaction score
0
Location
New York
I'll have to test it this weekend. The cooks tell me it's a 26" diameter pot which, at full power, will boiloff nearly 3 gallons an hour! I think at a steady boil, top open, it will probably work out closer to 1.5 - 2 gallons an hour. If I punch those numbers in I get much closer to Vinnie's 8 gallon suggestion. Usually right around 8.2 - 8.35 pre-boil volume. So that's probably it.
 
OP
mrgstiffler

mrgstiffler

Well-Known Member
Joined
May 10, 2009
Messages
1,025
Reaction score
95
Location
Newberg, OR, Cascadia
I'll have to test it this weekend. The cooks tell me it's a 26" diameter pot which, at full power, will boiloff nearly 3 gallons an hour! I think at a steady boil, top open, it will probably work out closer to 1.5 - 2 gallons an hour. If I punch those numbers in I get much closer to Vinnie's 8 gallon suggestion. Usually right around 8.2 - 8.35 pre-boil volume. So that's probably it.
Yeah, boiloff rate is very important. It varies a lot between setups.
 
OP
mrgstiffler

mrgstiffler

Well-Known Member
Joined
May 10, 2009
Messages
1,025
Reaction score
95
Location
Newberg, OR, Cascadia
Any chance you could add a grain to water ratio to determine strike water volume for those who need to (or want to) dunk sparge?
I can look at adding a water to grain ratio. In the meantime, you can select mashout. It splits the volume into a mash volume and a boiling water addition for a mashout. You could use the same volumes but don't use boiling water for your dunk sparge.
 
Top