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Yeast Starter
This tool estimates number of yeast cells needed to properly ferment specific beer (based on beer style, it's volume and gravity), estimates number of available yeast cells (based on yeast type and age) and finally helps to determine volume and gravity of appropriate (up to 5 steps) starter.
The tool uses information from
Yeast: The Practical Guide to Beer Fermentation
book, from
Braukaiser
blog and from
Pivařka
book.
Finished Starter yeast cell count N is calculated from following equation
N = (I + G) * V * S
where
I
represents Initial Cells in billions per gram of extract,
G
represents Growth Rate in billions per gram of extract,
V
represents Starter Volume in Litters and
S
represents DME Mass Concentration.
Growth Rate depends on starter aeration type and
I
(Intial Cells Per Extract (B/g)).
Stirred starters
: if I < 1.4 then G = 1.4. If I is between 1.4 and 3.5 then G = 2.33 - (0.67 * I). If I > 3.5 then G = 0.
Manually shaken starters
: if I < 3.5 than G = 0.62. If I > 3.5 than G = 0.
No agitation
: if I < 3.5 than G = 0.4. If I > 3.5 than G = 0.
This tool can be also optionally used to calculate
overbuild
starter (when brewer harvests yeast for future brews directly from starter) including pitch and harvest volumes (starter must be well-stirred before splitting).
Notes:
Tool is available for
registered
users only.
Choose units.
Enter Batch Size (wort volume in fermenter) and Original Gravity.
Enter Coefficient according to following instructions:
0.75 - ALE (up to 15°Plato)
1.0 - strong ALE (more than 15°Plato)
1.5 - lager
2.0 - strong lager
Optionally enter Overbuild cell count.
Choose number of starter steps (up to 5).
Choose yeast type - dry, liquid or slurry - and enter manufactured/harvested date, usage date (date of starter preparation) and available yeast amount (enter number of packs or vials when using Liquid yeast). Alternatively, the amount of available cells can be entered directly.
Note:
Cells Available field must contain some value otherwise the next steps won't work...
For each starter step specify it's Aeration type (Stir plate, Manually shaken, No agitation), volume and gravity (recommended value is 9° Plato or 1.036 SG).
Tool calculates DME weight needed to achieve required starter volume&gravity.
Besides
Final Cell Count
, this tool provides a couple of additional information:
Cells Per Extract (Billions per gram of extract).
Inoculation Rate (milions/mL). To achieve "best results" keep it between
25 and 100
.
Growth Rate (
G
).
Growth Factor. Should be at least
1.0
for "best" results.
Tool calculates Pitch&Harvest volumes if Final Cell Count is high enough (and Overbuild Cells count was specified).
Choose units
plato
SG
Invalid Input
liters
gallons
Invalid Input
grams
ounces
Invalid Input
Original Gravity
(*)
Enter value in a range between 1 and 50
Batch Size
(*)
Enter value in a range between 0 and 1000
Coefficient
(*)
Enter value in a range between 0 and 5
Overbuild Cells (in billions)
Enter value in a range between 0 and 10000
Starter steps count
1
2
3
4
5
Yeast type
Dry
Liquid (vial, pack)
Yeast slurry
Custom Cells Count
Yeast Manufactured
...
Invalid Input
Yeast Used
...
Invalid Input
Clear Dates
Yeast Avalilable
Enter value in a range between 0 and 1000
Yeast Viability
Invalid Input
Cells Available (in billions)
Enter value in a range between 0 and 1000
Cells needed (in billions)
Invalid Input
Step 1
Aeration Method
Stir Plate
Manually Shaken
No Agitation
Volume
Enter value in a range between 0 and 100
Gravity
Enter value in a range between 1 and 50
DME
Invalid Input
Cells Per Extract (B/g)
Invalid Input
Inoculation Rate (milions/mL)
Invalid Input
Growth Rate
Invalid Input
Growth Factor
Invalid Input
Final Cell Count (in billions)
Invalid Input
Calculate
Step 2
Aeration Method
Stir Plate
Manually Shaken
No Agitation
Volume
Enter value in a range between 0 and 100
Gravity
Enter value in a range between 1 and 50
DME
Invalid Input
Cells Per Extract (B/g)
Invalid Input
Inoculation Rate (milions/mL)
Invalid Input
Growth Rate
Invalid Input
Growth Factor
Invalid Input
Final Cell Count (in billions)
Invalid Input
Calculate
Step 3
Aeration Method
Stir Plate
Manually Shaken
No Agitation
Volume
Enter value in a range between 0 and 100
Gravity
Enter value in a range between 1 and 50
DME
Invalid Input
Cells Per Extract (B/g)
Invalid Input
Inoculation Rate (milions/mL)
Invalid Input
Growth Rate
Invalid Input
Growth Factor
Invalid Input
Final Cell Count (in billions)
Invalid Input
Calculate
Step 4
Aeration Method
Stir Plate
Manually Shaken
No Agitation
Volume
Enter value in a range between 0 and 100
Gravity
Enter value in a range between 1 and 50
DME
Invalid Input
Cells Per Extract (B/g)
Invalid Input
Inoculation Rate (milions/mL)
Invalid Input
Growth Rate
Invalid Input
Growth Factor
Invalid Input
Final Cell Count (in billions)
Invalid Input
Calculate
Step 5
Aeration Method
Stir Plate
Manually Shaken
No Agitation
Volume
Enter value in a range between 0 and 100
Gravity
Enter value in a range between 1 and 50
DME
Invalid Input
Cells Per Extract (B/g)
Invalid Input
Inoculation Rate (milions/mL)
Invalid Input
Growth Rate
Invalid Input
Growth Factor
Invalid Input
Final Cell Count (in billions)
Invalid Input
Calculate
Pitch Volume
Invalid Input
Harvest Volume
Invalid Input
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