Air Pirate

Recipes 

Does the addition of lactose affect the gravity of beer?

If so, I should expect a higher OG and FG than otherwise, but by how much?

malkore

Recipes 

Yes, lactose will raise the gravity, both the OG and the FG. Its a non-fermentable sugar.

It raises in proportion to the amount used. There are charts and calculators out there.

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Malkore
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10

avidhomebrewer

Recipes 

For a 5 gallon batch, I wouldn't think you'd go more than 1# of lactose. It will probably bump up the OG a few points, but as malkore pointed out, it is non-fermentable. It will lend a nice sweet (not too much) taste to the beer. I made a milk stout once and it turned out great.

Air Pirate

Recipes 

thanks guys