william_shakes_beer
Well-Known Member
Got my refractometer today. Brewing this weekend, and I'd like to use it to adjust the wort at the start of the boil by adding light DME to make up for any effeciency issues I might have.
Given: My recipie calls for an OG of 1.050 in a 5 gallon (to the fermenter) batch.
Given: SG preboil is 3.5 gallons at 1.035
I ignore boiloff, since water lost will be replaced by topoff after cooling.
1. Calculate Sg after topoff
3.5/5=0.7*.035=1.0245
2. Calculate how much DME to add
DME provides 45 gravity points per pound per gallon.
Need to add .050-.025=.025 or 25 gravity points. 25 GP x 5 gallons = 125 GP needed in extract. 125/45 = 2.77 pounds DME needed
Is my math correct?
Given: My recipie calls for an OG of 1.050 in a 5 gallon (to the fermenter) batch.
Given: SG preboil is 3.5 gallons at 1.035
I ignore boiloff, since water lost will be replaced by topoff after cooling.
1. Calculate Sg after topoff
3.5/5=0.7*.035=1.0245
2. Calculate how much DME to add
DME provides 45 gravity points per pound per gallon.
Need to add .050-.025=.025 or 25 gravity points. 25 GP x 5 gallons = 125 GP needed in extract. 125/45 = 2.77 pounds DME needed
Is my math correct?