The amount of grain you'll need to sub for extract will be entirely dependent on the total efficiency of your system.
Here is a recipe I just threw together in BeerSmith. It assumes 75% total efficiency and a 90 minute boil (I do 90 minute boils on most of my brews). Using the grains you have on hand, it looked pretty good, but the color was a little light, so the 2 oz of chocolate was added to give the color a more "blood moon" look. Feel free to omit if you are okay with a more orange looking brew.
BeerSmith 2 Recipe Printout -
http://www.beersmith.com
Recipe: Blood Moon IPA
Brewer:
Asst Brewer:
Style: American IPA
TYPE: All Grain
Taste: (30.0)
Recipe Specifications
--------------------------
Boil Size: 7.08 gal
Post Boil Volume: 5.20 gal
Batch Size (fermenter): 5.00 gal
Bottling Volume: 4.50 gal
Estimated OG: 1.061 SG
Estimated Color: 13.8 SRM
Estimated IBU: 77.7 IBUs
Brewhouse Efficiency: 75.00 %
Est Mash Efficiency: 75.0 %
Boil Time: 90 Minutes
Ingredients:
------------
Amt Name Type # %/IBU
8 lbs Pale Malt (2 Row) US (2.3 SRM) Grain 1 70.3 %
1 lbs Vienna Malt (Weyermann) (3.0 SRM) Grain 2 8.8 %
12.0 oz Amber Malt (22.0 SRM) Grain 3 6.6 %
12.0 oz Cara-Pils/Dextrine (2.0 SRM) Grain 4 6.6 %
12.0 oz Caramel/Crystal Malt - 60L (60.0 SRM) Grain 5 6.6 %
2.0 oz Chocolate Malt (350.0 SRM) Grain 6 1.1 %
1.00 oz Cascade [7.50 %] - Boil 60.0 min Hop 7 30.2 IBUs
0.50 oz Cascade [7.50 %] - Boil 15.0 min Hop 8 7.5 IBUs
0.50 oz Citra [12.50 %] - Boil 15.0 min Hop 9 12.5 IBUs
0.50 oz Galaxy [14.00 %] - Boil 15.0 min Hop 10 14.0 IBUs
0.50 oz Cascade [7.50 %] - Boil 5.0 min Hop 11 3.0 IBUs
0.50 oz Citra [12.50 %] - Boil 5.0 min Hop 12 5.0 IBUs
0.50 oz Galaxy [14.00 %] - Boil 5.0 min Hop 13 5.6 IBUs
1.0 pkg Safale American (DCL/Fermentis #US-05) Yeast 14 -
1.00 oz Cascade [7.50 %] - Dry Hop 6.0 Days Hop 15 0.0 IBUs
1.00 oz Citra [12.50 %] - Dry Hop 6.0 Days Hop 16 0.0 IBUs
1.00 oz Galaxy [14.00 %] - Dry Hop 6.0 Days Hop 17 0.0 IBUs
Mash Schedule: BIAB, Light Body
Total Grain Weight: 11 lbs 6.0 oz
----------------------------
Name Description Step Temperat Step Time
Saccharification Add 8.14 gal of water at 153.0 F 149.0 F 75 min
Sparge: If steeping, remove grains, and prepare to boil wort
Notes:
------
US-05
Created with BeerSmith 2 -
http://www.beersmith.com
-------------------------------------------------------------------------------------
Edit: Mis-read the original recipe. Replaced Pilsener malt for Cara-pils.