Raspberries affecting ABV

[Torchiest]

Hey all,

I just brewed my wit this morning, and in a week or so I'll be racking it onto a few pounds of raspberries in the secondary. I think I understand the basic procedure of pasteuring by heating the raspberries in water to ~170º for ten minutes or so, and getting them into the fermenter, etc. What I'm curious about is if there is a way to determine how much alcohol the fermentation of raspberries will add to the beer. Is there some basic conversion formula, or is it entirely neglegible, or what?

 

[david_42]

Raspberries are relatively low in sugar, as low as 5% by weight. A couple pounds wouldn't add much.

 

[TheJadedDog]

When I did my holiday porter I added 2lbs of raspberries to the secondary and racked on top, didn't change my ABV in the slightest.

 

[the_bird]

My raspberry ale, I don't recall any activity at all in the secondary. I would expect this means that fermentation is minimal.