I just started an Imperial Stout and I use iBrewmaster. It calculated the OG at 1.094 but it came out at 1.078, pretty big difference and I am trying to figure out why. I double checked ingredients. Only thing I can think of is I had it in the system as a 5.5 gallon boil going down to a 5 gallon batch and I only boiled 4.5 gall then added water to bring it up to 5 gallons before taking the gravity reading. But either way it should still be the same right? Here is the recipe
Imp stout
Style: Imperial Stout OG: 1.078 (I changed it to the actual one, it was estimated 1.094)
Type: Extract FG: 1.018
Rating: 4.0 ABV: 7.86 %
Calories: 254 IBU’s: 55.18
Efficiency: 70 % Boil Size: 5.57 Gal
Color: 35.4 SRM Batch Size: 5.00 Gal
Preboil OG: 1.088 Boil Time: 60 minutes
Fermentation Steps
Name Days / Temp
Primary 14 days @ 68.0°F
Secondary 14 days @ 72.0°F
Grains & Adjuncts
Amount Percentage Name Time Gravity
6.00 lbs 42.11 % Briess Golden Light LME 60 mins 1.038
5.00 lbs 35.09 % Briess Golden Light LME 30 mins 1.038
1.00 lbs 7.02 % Briess Caramel 120L 60 mins 1.032
0.50 lbs 3.51 % Brown Malt 60 mins 1.032
0.50 lbs 3.51 % Briess Caramel 20L 60 mins 1.033
0.50 lbs 3.51 % Chocolate Malt 60 mins 1.034
0.50 lbs 3.51 % Briess Caramel 40L 60 mins 1.034
0.25 lbs 1.75 % Briess Roasted Barley 60 mins 1.033
Hops
Amount IBU’s Name Time AA %
3.00 ozs 51.35 Cluster 60 mins 7.00
1.00 ozs 1.76 Northern Brewer 2 mins 8.50
1.00 ozs 2.07 Centennial 2 mins 10.00
Yeasts
Amount Name Laboratory / ID
3.00 pkg California Ale White Labs 0001
Additions
Amount Name Time Stage
8.00 oz Malto-Dextrine 15 mins Boil