National Homebrew Day Giveaway - Enter Now - Weekend Giveaway!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > yeastcalc vs. mr. malty
Reply
 
Thread Tools
Old 02-20-2013, 04:03 AM   #1
mike024
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2012
Location: Petaluma, Ca
Posts: 67
Liked 5 Times on 5 Posts
Likes Given: 2

Default yeastcalc vs. mr. malty

I am doing my first yeast starter ever and am using a stir plate. I entered my numbers into both and came up with two very different results for viability. Yeastcalc gave me 89% which was enough cells ti cover my yeast requirement. On Mr. Malty it gave me a 71% viability and needing two packs to get the right count. The yeast is a Wyeast 1968 London esb. Mfg. date was January 13. Anybody have a preference as to which one they trust more? The guy at my LHBS said to use one pack as a starter and add the other one when I pitch. Three different answers for one starter. I hope it gets easier.
mike024 is offline
 
Reply With Quote
Old 02-20-2013, 11:41 AM   #2
RM-MN
HBT_SUPPORTER.png
Feedback Score: 1 reviews
Recipes 
 
Join Date: Nov 2010
Location: Solway, MN
Posts: 7,986
Liked 1072 Times on 891 Posts
Likes Given: 551

Default

Just for kicks, enter an older date into Mr. Malty. It has been known to give you results that are crazy, like needing more starter than you have wort in the fermenter. The yeast calculators are not perfect. Nobody can predict the exact condition the yeast has been through between manufacture and your starter so your yeast may be much more viable than predicted or it could be mostly dead cells. It also would depend on the amount of oxygen you get dissolved in your wort before pitching as the oxygen controls how much the yeast can replicate. (simplified, I know)
RM-MN is offline
 
Reply With Quote
Old 02-20-2013, 11:50 AM   #3
LLBeanJ
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
LLBeanJ's Avatar
Recipes 
 
Join Date: Feb 2012
Location: Windsor, CO
Posts: 2,187
Liked 427 Times on 322 Posts
Likes Given: 165

Default

They both have their strengths and weaknesses. I use yeastcalc to make/step-up starters and Mrmalty when I am re-pitching slurry. If starting with a fresh vial or smack pack, go with yeastcalc's numbers and you'll be good.
LLBeanJ is offline
 
Reply With Quote
Old 02-20-2013, 12:53 PM   #4
mike024
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2012
Location: Petaluma, Ca
Posts: 67
Liked 5 Times on 5 Posts
Likes Given: 2

Default

Thanks guys. I have it stirring at the moment. Is there anything specific I should be looking for to know whether it is finished or not. Right now it looks like spinning beer with a foam cone over the vortex. Are the yeast supposed ti be doing anything visual here. It seems underwhelming. I hope I am doing this right.
mike024 is offline
 
Reply With Quote
Old 02-20-2013, 12:57 PM   #5
MalFet
/bɪər nərd/
HBT_LIFETIMESUPPORTER.png
Feedback Score: 1 reviews
 
MalFet's Avatar
Recipes 
 
Join Date: May 2010
Location: NYC / Kathmandu
Posts: 8,290
Liked 1276 Times on 849 Posts
Likes Given: 593

Default

The trouble with the viability calculations is that there'e simply no way for them to accurate. Yeast stored for three months at 40F will be healthier than yeast stored for three hours in a hot delivery van. Mr. Malty is much more conservative in this respect than yeastcalc. Which is more accurate, ultimately, depends on your situation.
__________________
"Be excellent to each other." -Benjamin Franklin
MalFet is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
First Lager, First time using YeastCalc davekippen Fermentation & Yeast 7 01-24-2013 12:03 AM
total cells at finish (yeastcalc) to calculate slurry amount Veedo Fermentation & Yeast 0 10-24-2012 08:55 PM
yeastcalc.com question dermotstratton Fermentation & Yeast 8 07-13-2012 12:24 AM
YeastCalc and culturing yeast from bottles jmf143 Fermentation & Yeast 3 12-06-2011 06:29 PM
Mr. Malty vs. YeastCalc vs. Beersmith 2.0 Spartan1979 Fermentation & Yeast 5 12-03-2011 12:22 AM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS