For 1 pound of honey in 5 gallons:

35 pppg divided by 5 gallons = 7 points or 0.007, which would be expected to raise final ABV by about 0.7%. How's that for some quick math!

EDIT: And DME has about 45 pppg, so then you get about 0.9% instead, as a rough estimate, which is consistent with others above.