Some Technical Info

% Alpha Acid Utilization Schedule
Boil Time	1.03 OG	1.04 OG	1.05 OG	1.06 OG	1.07 OG	1.08 OG
15	13.7%	12.5%	11.4%	10.5%	9.6%	8.7%
30	21.2%	19.4%	17.7%	16.2%	14.8%	13.5%
45	25.3%	23.3%	21.2%	19.4%	17.7%	16.2%
60	27.6%	25.2%	23.1%	21.1%	19.3%	17.6%
90	29.5%	27.0%	24.7%	22.6%	20.6%	18.8%

For more detailed chart, go here.
Or download my Brewing Log with this IBU calculator and chart included.
To use the percent utilization values from above, apply this equation:

           (weight of hops in ounces)(% Alpha Acid)(% Utilization)
    IBU =  _______________________________________________________
                       (Final Wort Volume gallons)*1.34

Guidelines for Infusion Mashing
Grains/Adjuncts	Strike H₂0 (gal) 170 F	H₂0 Absorbed by Grain	Sparge H₂0 @170 F	H₂0 Added to Boil
6 lbs.	1.5	.6	3.0	2.0
7 lbs.	1.75	.7	3.5	1.5
8 lbs.	2.0	.8	4.0	.75
9 lbs.	2.25	.9	4.5	.25
10 lbs.	2.5	1.0	5.0	0

Guidelines for Temperature Controlled Mashing
Grains/Adjuncts	Strike H₂0 (gal) 130 F	H₂0 (gal) at 200 F to Raise Mash 15 degrees	H₂0 Absorbed by Grain	Sparge H₂0 @170 F	H₂0 Added to Boil
6 lbs.	1.5	3	.6	3.0	1.35
7 lbs.	1.75	3.5	.7	3.5	.575
8 lbs.	2.0	4	.8	4.0	.25
9 lbs.	2.25	4.5	.9	4.5	0
10 lbs.	2.5	5	1.0	5.0	0

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