Amarillo IPA bitterness question

[mattp94]

I made up a recipe using beer engine and brewed this back on 30/10/14. The recipe is below. I have just taken a gravity sample which was 1.010 so all seems to be going well and have dry hopped with 100g of Amarillo pellets. The gravity sample tasted pretty good but when I plug the same ingredients and boil times into Beersmith it gives me an IBU of 99.2
That came as quite a surprise as the beer engine software only showed 60EBU.
From the taste of it I would say it is much closer to the 60 mark than 99 but where could I be going wrong with Beersmith.

Anyone have any ideas please?


Fermentable Colour Grams Ratio
Caramalt 30 EBC 200 grams 6.1%
Dried Malt Extract Pale 10 EBC 3000 grams 90.9%
Sugar, Household White 0 EBC 100 grams 3%


Hop Variety Type Alpha Time grams Ratio
Amarillo Whole 8.9 % 60 mins 30 grams 15.4%
Amarillo Whole 8.9 % 20 mins 20 grams 10.3%
Amarillo Whole 8.9 % 15 mins 15 grams 7.7%
Amarillo Whole 8.9 % 10 mins 20 grams 10.3%
Amarillo Whole 8.9 % 5 mins 10 grams 5.1%
Amarillo Pellet 7.1 % 0 mins 100 grams 51.3%

Final Volume: 18 Litres
Original Gravity: 1.063
Final Gravity: 1.013
Alcohol Content: 6.5% ABV
Total Liquor: 23 Litres
Mash Liquor: 0.5 Litres
Mash Efficiency: 75 %
Bitterness: 60. EBU
Colour: 19 EBC

[BitterTed]

Different programs may use different formulas to calculate bitterness. In my Promash program I can select which formula to calculate bitterness, IMO you should simply stick with one program and one formula to calculate the bitterness that will be the only way to be consistent batch to batch.