Welcome to OnlineConversion.com Forums

 OnlineConversion Forums Calculating Gallons of Grape Must from Pounds?
 [ Home ] [ Forum Home ] Register FAQ Calendar Search Today's Posts Mark Forums Read

 Convert and Calculate Post any conversion related questions and discussions here. If you're having trouble converting something, this is where you should post.* Guest Posting is allowed.

#1
09-20-2009, 09:43 PM
 Unregistered Guest Posts: n/a
Calculating Gallons of Grape Must from Pounds?

Does anyone have any idea how to calculate the number of gallons I have from the weight of must (crushed grapes)? Would it be close to just divide by 8.34 (water)? Calculations for adding yeast, nutrients, etc are all given for gallons but when my fermenters are filled by weight and I've been mostly guessing at the number of gallons so far.

#2
09-21-2009, 04:17 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,220 Rep Power: 18
Re: Calculating Gallons of Grape Must from Pounds?

Quote:
 Originally Posted by Unregistered Does anyone have any idea how to calculate the number of gallons I have from the weight of must (crushed grapes)? Would it be close to just divide by 8.34 (water)? Calculations for adding yeast, nutrients, etc are all given for gallons but when my fermenters are filled by weight and I've been mostly guessing at the number of gallons so far. Thanks in advance.
Using the value for water would be gairly close.

I believe the sugar content would make it slightly higher. A hydrometer is a relatively inexpensive glass float (about \$20) for measuring density or specific gravity. If SG were 1.05, the weight per gallon would be 5% higher than water, 8.76 lb/gallon.

I would suggest researching typical starting SG on the Internet or buying a hydrometer. As the sugars are fermented, the SG will fall to a value close to 1.00 or a little below. Thus SG is used to monitor fermentation throughout the process.

Note that hydrometers which are sensitive (give high resolution readings) have a relatively narrow range. Do some research to determine range most relevant to wine-making.

Do you have an empty fermenter? Fill it with water and weight (weigh empty first). Use a dipstick to measure depth, and weight to establish gallons. Make a table. If your other fermenters are the same size (nominally) they will all be close)
#3
09-21-2009, 06:47 AM
 Unregistered Guest Posts: n/a
Re: Calculating Gallons of Grape Must from Pounds?

Thanks for the great advice! I do have a hydrometer the complication at this point is getting enough liquid from the must to fill my graduated cylinder. If I can't get enough liquid I will try the water method. Thanks again!

 Thread Tools Display Modes Linear Mode

 Posting Rules You may post new threads You may post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Main Forums     Convert and Calculate     Resources     General Chat

All times are GMT -8. The time now is 11:42 AM.