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Old 03-20-2009, 01:26 AM   #1
Tesla_HV
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Default A question about the "mrmalty" calculator

Sorry if this is a silly question but when using the liquid yeast tab on the Mr Malty Pitching Rate Calculator, it gives a recommended #liters of starter required. Is this the volume of the DME/water solution that you boil before pitching the yeast? If so, what is the ratio of DME to water that is recommended?



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Old 03-20-2009, 02:23 AM   #2
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From Fourteen Essential Questions About Yeast Starters

"When making starter wort, keep the starting gravity between 1.030 and 1.040 (7 - 10°P). You do not want to make a high gravity starter to grow yeast. As a ballpark measurement, use about 6 ounces (by weight) of DME to 2 quarts of water. If you're working in metric, it couldn't be easier. Use a 10 to 1 ratio. Add 1 gram of DME for every 10 ml of final volume. (If you're making a 2 liter starter, add water to 200 grams of DME until you have 2 liters total.) Add ¼ teaspoon of yeast nutrient, boil 15 minutes, cool, and add yeast."



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Old 03-20-2009, 02:25 AM   #3
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Starters generally have an OG between 1.03 and 1.04. So if Mr. Malty says you need a 3-liter starter, you'd add between 8.3 and 11 oz of DME to 3l of water, assuming 1.046 points per pound per gallon for the DME.

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Old 03-20-2009, 02:35 AM   #4
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Thanks for the replies. Do most of you weigh your DME? The instructions given with the yeast starter kit gives a volume (1/2 cup IIRC) to 650mL of water. What is the relationship then between weight and volume of DME?

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Old 03-20-2009, 03:15 AM   #5
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I weigh my DME in a measuring cup. As far as I can judge, 100g (~3.5 oz) = 3/4 cup, but that depends on how tightly it is packed.

-a.



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