### Author Topic: PG/P calculation for grains  (Read 1414 times)

#### IMperry9

• Assistant Brewer
• Posts: 217
##### PG/P calculation for grains
« on: June 16, 2015, 01:26:08 pm »
Hey guys I had a question on another thread about trying to figure out the extract efficiency of a certain grain that my brewing calculator does not have within its database. I use the brewing calculator from Brew Your Own as the foundation from building my recipe. Anyway I recently just bought a sack of Irish Ale malt by Malting Company of Ireland and I was trying to figure out the pg/p of this grain. would I be correct in this calculation?
Listed extract %: 82
PG/P= 82(from above)*5(batch size in gallons)/10(pounds used in batch)= 41pg/p
The brewing calculator has Maris Otter at a pg/p of 38 and I know that these malts are very similar but the Irish Ale malt has a higher extract ability. Any advice or wisdom would be greatly appreciated!

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#### a10t2

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##### Re: PG/P calculation for grains
« Reply #1 on: June 16, 2015, 01:59:13 pm »
100% potential extract is 46.2 point-gal/lb, so it would be:

46.2 * 0.82 * 10 / 5 = 76 points

Of course you then need to multiply by your mash efficiency to determine the actual gravity contribution.
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#### Derek

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##### Re: PG/P calculation for grains
« Reply #2 on: June 16, 2015, 02:56:05 pm »
Assuming the 82% is DBFG:

1+((82/100)*.04621)=1.038 p/gal