Thanks for looking into that for me mate.
I use Ian's spreadsheet and really like it but I've never understood why the style of beer you choose completely changes the estimated IBU...
I know the average IBU of your selected style is apart of the formula and that's why the IBU changes but I don't understand why...
I thought the only variables that affect IBU is amount of hops, AA%, boil time, gravity of boil and boil volume?
I don't want to brew a "style" anyway, I want to brew the above and know exactly what the IBU actually is and adjust to taste on the next brew.
I'll definitely check out brewmate, cheers again.