Evil Dead Red clone - IBU question

[bobbylonghare]

I found this recipe on the web.
Ingredients for 6 U.S. gallons
7.0 lb Light malt extract 4L
0.5 lb Munich Malt extract 8L

1.0 lb Crystal 40L
0.50 lb Victory Malt 25L
0.50 lb Crystal 120L
0.25 lb Pale Chocolate Malt 200L
0.5 oz (14 g) Centennial pellet hops, 10% alpha acid (20 min.) (6.4 IBU)
0.5 oz (14 g) Amarillo pellet hops, 7% alpha acid (20 min.) (4.5 IBU)
1.0 oz (28 g) Centennial pellet hops, 10% alpha acid (10 min.) (7.6 IBU)
1.0 oz (28 g) Amarillo pellet hops, 7% alpha acid (10 min.) (5.3 IBU)
1.0 oz (28 g) Centennial pellet hops, 10% alpha acid (0 min.) (0 IBU)
1.0 oz (28 g) Amarillo pellet hops, 7% alpha acid (0 min.) (0 IBU)

Target Original Gravity: 1.066 (16.21 Plato)
Approximate Final Gravity: 1.016 (4.08 Plato)
Brewhouse Efficiency: 70%
Anticipated SRM: 17
Anticipated IBUs: 23.8
Anticipated ABV: 6.66%


When I run it through the recipe tool, the IBUs are very different. It comes out as:
HOME BREW RECIPE:
Title: Evil Dead Red clone

Brew Method: Extract
Style Name: California Common Beer
Boil Time: 30 min
Batch Size: 5 gallons (fermentor volume)
Boil Size: 6 gallons
Boil Gravity: 1.057
Efficiency: 35% (steeping grains only)

STATS:
Original Gravity: 1.068
Final Gravity: 1.016
ABV (standard): 6.86%
IBU (tinseth): 39.22
SRM (morey): 18.59

FERMENTABLES:
7 lb - Dry Malt Extract - Light (71.8%)
0.5 lb - Dry Malt Extract - Munich (5.1%)

STEEPING GRAINS:
1 lb - American - Caramel / Crystal 40L (10.3%)
0.5 lb - American - Victory (5.1%)
0.5 lb - American - Caramel / Crystal 120L (5.1%)
0.25 lb - United Kingdom - Pale Chocolate (2.6%)

HOPS:
0.5 oz - Centennial, Type: Pellet, AA: 10, Use: Boil for 20 min, IBU: 10.82
0.5 oz - Amarillo, Type: Pellet, AA: 7, Use: Boil for 20 min, IBU: 7.57
1 oz - Centennial, Type: Plug, AA: 10, Use: Aroma for 10 min, IBU: 11.77
1 oz - Amarillo, Type: Pellet, AA: 7, Use: Aroma for 10 min, IBU: 9.07
1 oz - Centennial, Type: Pellet, AA: 10, Use: Aroma for 0 min
1 oz - Amarillo, Type: Pellet, AA: 7, Use: Aroma for 0 min

YEAST:
White Labs - California Ale Yeast WLP001
Starter: No
Form: Liquid
Attenuation (avg): 76.5%
Flocculation: Medium
Optimum Temp: 68 - 73 F
Fermentation Temp: 68 F


Generated by Brewer's Friend - http://www.brewersfriend.com/
Date: 2014-11-05 19:43 UTC
Recipe Last Updated: 2014-11-05 19:42 UTC


Any idea why the IBU values are so much higher? It says it is a recipe for 6 gallons. I assumed that was the boil size and I'd end up with about 5 gallons.
Thanks
Bobby

 

[Ozarks Mountain Brewery]

recipes on beer smith and other sites don't always have the same stats as this site like color , ibu or gravity, I wouldn't worry about matching someones recipe it usually comes out fine

this is mine

http://www.brewersfriend.com/homebrew/r ... l-dead-red

 

[bobbylonghare]

OK, then no worries I guess. I'm new to brewing and it is a little disconcerting that discrepancies like this can occur. Any idea why mismatches occur?

Than ks
Bobby

 

[Ozarks Mountain Brewery]

this site uses your settings in the equipment profile, all stats are based on the settings, brew kettle size, losses also the efficiency for brew house and yeast attenuation, not everyones settings are the same, I set my recipe's at 80% a new brewer will not even get 70 if lucky, big difference and the list goes on