#### pikelakehomebrew

• Cellarman
• Posts: 47
• brewing in the north metro
##### metric nerdery please: calculation question
« on: March 22, 2012, 12:29:16 pm »
So I'm considering going metric with my calculations and measurements, and am presently reading an excellent book [Designing Great Beers by Ray Daniels]; and in his book he talks about calculating the malt bill for your recipe based on a few variables.  All his calculations revolve around Gravity Units (GU) and imperial measurements (pounds and gallons).  Like a couple sample formulas:

Code: [Select]
`G.U. + Batch Size in Gallons = Total G.U.`
Code: [Select]
`G.U. per Pounds of Malt ÷ Extract Potential G.U. ÷ Mash Efficiency = Pounds of Grain Needed`
Now I know the simple method to make this Metric-friendly would be to simply insert the formula for imperial to metric conversion right in the formula.  But I'm just curious, with formulas like this in mind, how does the REST of the world calculate things like Total Gravity, Pounds of Grist needed, etc.  Like would they just use °Plato instead or do they have entirely different formulas?

Just curious.
pikelakehomebrew.com
On tap: Oktoberfest, Belgian Dubbel, Peach Blonde Ale, Surly Furious clone

#### gmac

• Senior Brewmaster
• Posts: 1702
• London, Ontario
##### Re: metric nerdery please: calculation question
« Reply #1 on: March 22, 2012, 12:34:14 pm »
I use Ibrewmaster and set the default settings to metric.

My advice, if you do it in metric, stay in metric and don't try to switch back and forth in your head.  I was in school during the switch so I can sort of do both but I find that I often measure my hops in grams, my water in liters but my grain in lbs.  Not sure why.
ADAA continuation rule 1.13D Sir...SUDDEN DEATH!

#### nateo

• Brewmaster General
• Posts: 2133
##### Re: metric nerdery please: calculation question
« Reply #2 on: March 22, 2012, 12:46:12 pm »
I'm pretty sure most of the probrewer world uses Plato, and wine guys use Brix.

The imperial system makes so little sense to me, I do all my measurements in metric. I couldn't tell you how many ounces are in 3 pints if my life depended on it.
In der Kürze liegt die Würze.

#### morticaixavier

• Official Poobah of No Life.
• Posts: 3960
• Davis, CA
##### Re: metric nerdery please: calculation question
« Reply #3 on: March 22, 2012, 01:02:17 pm »
I'm pretty sure most of the probrewer world uses Plato, and wine guys use Brix.

The imperial system makes so little sense to me, I do all my measurements in metric. I couldn't tell you how many ounces are in 3 pints if my life depended on it.

48
"Creativity is the residue of wasted time" - A. Einstein
Fermenting:
CA Farmhouse Mk II w/ Almanac BR#1 dregs
CA Farmhouse Mk I w/ bugs & Cherries
On Tap:
California Farmhouse Mark II
In Bottles:
California Farmhouse Mark I
Tipsy Santa stout
2011 Sweet William BW
2011 Rumble Fish - Rumble barrel aged BW
2012 Belgian Wheat Wine with coconut sugar
2012 Sweet William maple BW
2012 All Munich BW

#### weithman5

• Senior Brewmaster
• Posts: 1591
• naperville, il
##### Re: metric nerdery please: calculation question
« Reply #4 on: March 22, 2012, 01:05:58 pm »
I'm pretty sure most of the probrewer world uses Plato, and wine guys use Brix.

The imperial system makes so little sense to me, I do all my measurements in metric. I couldn't tell you how many ounces are in 3 pints if my life depended on it.

48.  thought it would take me all day to save a life.
i use ibrewmaster and love it. i do everything in imperial units except for my hops.  i brew 2 gallons (about 8liters nateo ) and it is easier to make the hops in grams.  i have been thinking of switching to metric before i got ibrewmaster but all i need to do is switch the default and it does it for me.

to the op instead of gravity points per pound, say a malt gives you 36 gravity points per pound.  you could divide this by 2.2 to get gravity points per kg and that would still be in a gallon. (now about 17 points per kilogram per gallon.  now divide by 3.9 so about 4.3 points per kilogram per liter.)  thus divide your potential by 12.5 and there you have it.

now you see why i just let the ibrewmaster do it these days.
Don AHA member

#### weithman5

• Senior Brewmaster
• Posts: 1591
• naperville, il
##### Re: metric nerdery please: calculation question
« Reply #5 on: March 22, 2012, 01:08:28 pm »
morti you beat me to it

sorry that was not 12 .5 but about 8.6
Don AHA member

#### morticaixavier

• Official Poobah of No Life.
• Posts: 3960
• Davis, CA
##### Re: metric nerdery please: calculation question
« Reply #6 on: March 22, 2012, 01:34:27 pm »
I'm pretty sure most of the probrewer world uses Plato, and wine guys use Brix.

The imperial system makes so little sense to me, I do all my measurements in metric. I couldn't tell you how many ounces are in 3 pints if my life depended on it.

48.  thought it would take me all day to save a life.
i use ibrewmaster and love it. i do everything in imperial units except for my hops.  i brew 2 gallons (about 8liters nateo ) and it is easier to make the hops in grams.  i have been thinking of switching to metric before i got ibrewmaster but all i need to do is switch the default and it does it for me.

to the op instead of gravity points per pound, say a malt gives you 36 gravity points per pound.  you could divide this by 2.2 to get gravity points per kg and that would still be in a gallon. (now about 17 points per kilogram per gallon.  now divide by 3.9 so about 4.3 points per kilogram per liter.)  thus divide your potential by 12.5 and there you have it.

now you see why i just let the ibrewmaster do it these days.

Lbs to Kilo would multiply by 2.2 rather than divide. 36 points per pound would be 72.72 points per kilo
"Creativity is the residue of wasted time" - A. Einstein
Fermenting:
CA Farmhouse Mk II w/ Almanac BR#1 dregs
CA Farmhouse Mk I w/ bugs & Cherries
On Tap:
California Farmhouse Mark II
In Bottles:
California Farmhouse Mark I
Tipsy Santa stout
2011 Sweet William BW
2011 Rumble Fish - Rumble barrel aged BW
2012 Belgian Wheat Wine with coconut sugar
2012 Sweet William maple BW
2012 All Munich BW

#### weithman5

• Senior Brewmaster
• Posts: 1591
• naperville, il
##### Re: metric nerdery please: calculation question
« Reply #7 on: March 22, 2012, 01:39:48 pm »
22 pound kid only weighs 10 pounds.  ( 1 pound loaf of bread is 454 grams or just under a half pound)
Don AHA member

#### a10t2

• I spend way too much time on the AHA forum
• Posts: 2944
• Ask me why I don't like Chico!
##### Re: metric nerdery please: calculation question
« Reply #8 on: March 22, 2012, 01:53:36 pm »
But I'm just curious, with formulas like this in mind, how does the REST of the world calculate things like Total Gravity, Pounds of Grist needed, etc.  Like would they just use °Plato instead or do they have entirely different formulas?

The formula is actually the same, it's just the constants and units that change. So instead of representing potential extract as, say, point-gallons per pound, you'd use degree Plato-liters per kilogram, and so on. Base malts tend to be around 37 point-gal/lb, which is about 77 °P-L/kg. If you want to brew 20 L of a 12°P (1.048) beer at 80% efficiency:

(20 L * 12°P)/(77°P-L/kg * 80%) = 3.9 kg

or in American customary units: (5.25 gal * 48 points)/(37 point-gal/lb * 80%) = 8.5 lb

The two answers are the same, just given in different units.

°Plato tends to be more common in Europe, SG in the UK, and American brewers use whichever they learned first, more or less.

The imperial system makes so little sense to me, I do all my measurements in metric. I couldn't tell you how many ounces are in 3 pints if my life depended on it.

The real problem with the "imperial system" is that unless you specify which "pint" and which "ounce" you're talking about, you can't even come up with an answer.
Beer is like porn. You can buy it, but it's more fun to make your own.
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#### punatic

• Official Poobah of No Life.
• Posts: 4065
• Puna District, Hawaii Island (UTC -10)
##### Re: metric nerdery please: calculation question
« Reply #9 on: March 22, 2012, 03:10:35 pm »
I find my brews taste superior if I measure my mash, ferment, and serving temps in Kelvins.
There is only one success: to be able to spend your life in your own way.

AHA Life Member #33907

#### morticaixavier

• Official Poobah of No Life.
• Posts: 3960
• Davis, CA
##### Re: metric nerdery please: calculation question
« Reply #10 on: March 22, 2012, 03:12:22 pm »
I find my brews taste superior if I measure my mash, ferment, and serving temps in Kelvins.

nah, I don't drink beer if it's colder than 439 degrees.
"Creativity is the residue of wasted time" - A. Einstein
Fermenting:
CA Farmhouse Mk II w/ Almanac BR#1 dregs
CA Farmhouse Mk I w/ bugs & Cherries
On Tap:
California Farmhouse Mark II
In Bottles:
California Farmhouse Mark I
Tipsy Santa stout
2011 Sweet William BW
2011 Rumble Fish - Rumble barrel aged BW
2012 Belgian Wheat Wine with coconut sugar
2012 Sweet William maple BW
2012 All Munich BW

#### Pinski

• Senior Brewmaster
• Posts: 1089
• Portland, Oregon
##### Re: metric nerdery please: calculation question
« Reply #11 on: March 22, 2012, 03:15:46 pm »
I find my brews taste superior if I measure my mash, ferment, and serving temps in Kelvins.

nah, I don't drink beer if it's colder than 439 degrees.

439 degrees what
Thank you BEER!

#### punatic

• Official Poobah of No Life.
• Posts: 4065
• Puna District, Hawaii Island (UTC -10)
##### Re: metric nerdery please: calculation question
« Reply #12 on: March 22, 2012, 03:21:23 pm »
I find my brews taste superior if I measure my mash, ferment, and serving temps in Kelvins.

nah, I don't drink beer if it's colder than 439 degrees.

439 degrees what

439 degrees of separation!  (7 2/3 radians)
There is only one success: to be able to spend your life in your own way.

AHA Life Member #33907

#### morticaixavier

• Official Poobah of No Life.
• Posts: 3960
• Davis, CA
##### Re: metric nerdery please: calculation question
« Reply #13 on: March 22, 2012, 03:26:53 pm »
I find my brews taste superior if I measure my mash, ferment, and serving temps in Kelvins.

nah, I don't drink beer if it's colder than 439 degrees.

439 degrees what

okay, after further research I don't like my beer any colder than 280 degrees kelvin
"Creativity is the residue of wasted time" - A. Einstein
Fermenting:
CA Farmhouse Mk II w/ Almanac BR#1 dregs
CA Farmhouse Mk I w/ bugs & Cherries
On Tap:
California Farmhouse Mark II
In Bottles:
California Farmhouse Mark I
Tipsy Santa stout
2011 Sweet William BW
2011 Rumble Fish - Rumble barrel aged BW
2012 Belgian Wheat Wine with coconut sugar
2012 Sweet William maple BW
2012 All Munich BW

#### a10t2

• I spend way too much time on the AHA forum
• Posts: 2944
• Ask me why I don't like Chico!
##### Re: metric nerdery please: calculation question
« Reply #14 on: March 22, 2012, 03:27:51 pm »
okay, after further research I don't like my beer any colder than 280 degrees kelvin

After still further research you will learn that that isn't a unit of measurement.
Beer is like porn. You can buy it, but it's more fun to make your own.
http://seanterrill.com/category/brewing/