# PPG potential conversion to metric

### Help Support Homebrew Talk:

#### chuckjaxfl

##### Well-Known Member
Has anyone already figured out the formula to convert points/pound/gallons to points/kilograms/liters?

#### 944play

##### Well-Known Member
Code:
``````bianco:~ john\$ units
500 units, 54 prefixes
You have: pounds/gallon
You want: kilograms/liter
* 0.11982643
/ 8.3454045``````
HTH.

OP
C

#### chuckjaxfl

##### Well-Known Member
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?

#### ajdelange

##### Well-Known Member
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.

OP
C

#### chuckjaxfl

##### Well-Known Member
So, roughly...

1ppg = 8.316 pKgL?

OP
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#### chuckjaxfl

##### Well-Known Member
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.