Gravity points for priming

How do you determine how many gravity points you need to add to your beer to prime to a certain carbonation level?

Ex. I had 3.5 gallons of beer, shooting for 2.4 volumes of CO2. I think I added 3 oz of cane sugar. Ended up going from 1.010 FG to 1.015 when going into the bottle.

do you have any software? I’d recommend getting beersmith... Also, sounds like you bottled way to soon on the other beer.

Here is an online calc:http://www.tastybrew.com/calculators/priming.html

I think it’s something like .02 gravity points gives you 2 vols of CO2, which with the residual CO2 in solution (temp depending) should be around average (2.5 vol) carbonation.

my understanding is that each point of gravity is 0.5 VOC, and if you have still beer you can assume there is already 1 VOC

so if you want 2.5 VOC total you need to bump the gravity by 3 points

so a 5 point bump would put you around 3.5 VOC (1 at atmospheric pressure +2.5)

most bottles (12 or 22oz) are rated at 3 VOC but can handle about 3.8 (or more) as a safety that isn’t advertised.

Originally posted by DA
Here is an online calc:http://www.tastybrew.com/calculators

+1

I’ve never cared about the effect on gravity, only the ratio of the weight of the sugar or DME to gallons of beer. I guess you could do it as a gravity calculation, but that feels like overthinking the problem.

And those numbers are ounces by weight, not volume.