PPG potential conversion to metric - Home Brew Forums

 Home Brew Forums > PPG potential conversion to metric

09-06-2010, 09:18 PM   #1
chuckjaxfl
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Feb 2010
Jacksonville, FL
Posts: 327
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Has anyone already figured out the formula to convert points/pound/gallons to points/kilograms/liters?

09-06-2010, 10:30 PM   #2
944play

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Jul 2008
Santa Rosa, CA
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Code:
```bianco:~ john\$ units
500 units, 54 prefixes
You have: pounds/gallon
You want: kilograms/liter
* 0.11982643
/ 8.3454045```
HTH.
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09-06-2010, 11:25 PM   #3
chuckjaxfl
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Feb 2010
Jacksonville, FL
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I'm not following.

If I've got DME that will contribute 44 PPG, are you suggesting that I can take that and multiply it by 0.11982643/8.3454045 to get a metric contribution?

That would give me 0.631768409 points (1.0006) wort if I use a kilogram of the DME in a liter of water?

09-07-2010, 02:00 AM   #4
ajdelange
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Aug 2010
McLean/Ogden, Virginia/Quebec
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points/pound/gal = points/(kg*2.2)/(liters/3.78)

Thus points/kg/l = 3.78*2.2 points/pound/gal.

Thus 44 ppppg = 365.9 ppkgpL and 1 kg of this DME in 1L would give 365.9 points or SG 1.3659 (except that at this strength the deviation from linearity would probably be noticeable. OTOH if you put .454 kg in 3.78L you would have 365.9*.454/3.78 = 44 points.

09-07-2010, 02:13 AM   #5
chuckjaxfl
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Feb 2010
Jacksonville, FL
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So, roughly...

1ppg = 8.316 pKgL?

09-07-2010, 03:20 AM   #6
BigEd
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Nov 2004
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Quote:
 Originally Posted by chuckjaxfl Has anyone already figured out the formula to convert points/pound/gallons to points/kilograms/liters?
They're working on it at CERN during lunch breaks.

http://www.onlineconversion.com/

09-07-2010, 04:00 AM   #7
chuckjaxfl
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Feb 2010
Jacksonville, FL
Posts: 327
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Here is why I was wanting to know.

I've read some pages of people making slants/plates by simply measuring out the DME & Agar dry into each slant/plate, then adding hot water with a dosing syringe.

This seems less wasteful than my current method of making up 100ml of wort/agar, pouring too many plates, and then having them dry up before I can use them.

I wanted the conversion so I could make this spreadsheet. I can enter the numbers in column B, it will tell me what I need in column F.

09-07-2010, 11:40 AM   #8
ajdelange
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Aug 2010
McLean/Ogden, Virginia/Quebec
Posts: 9,430
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Quote:
 Originally Posted by chuckjaxfl So, roughly... 1ppg = 8.316 pKgL?
Yes.

11-27-2010, 12:31 AM   #9
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Sep 2010
New Zealand
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I use this a bit (living in metric land).

I find it easier converting it to points per 100g per litre which is 1ppg = .8316 p/100g/L.

I like to work out my effeciency this way as the recipes I use are metric.