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What does low grav beer mean?

Brewing British bitters from NB . Says it is a low grav beer. I noted that it had an OG of 1.040. Will it have less alcohol content?

Yep. With a 1.040 gravity you should be around 4% abv.

Low gravity means that it has a low starting gravity. So yes lower alcohol.

(SG-FG)*131 = ABV

SG = OG = Starting Original Gravity

With a lower starting gravity there is only so much sugar in the wort for the yeast to eat. So less potential gravity.

for example:

(1.040-1.010)*131 = 3.93% ABV


(1.080-1.010)*131 = 9.17%

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