Bottling/priming sugar

I'm bottling my friends beer tonight. He definitely ended up with less than the 5 gallons he was going for. My question is do I need to adjust the amount of priming sugar? How do I know how much to decrease it by?

Try this link: http://www.tastybrew.com/calculators/priming.html

General rule of thumb would be 1oz sugar per gallon of beer. That will give you approx. 2.5volumes of CO2.

Good calculator. I will add it to my toolbox
NickN, most calculators list priming sugar by weight. I do not have a small scale and measure by volume. Granulated sugar is close to 1 oz dry = 1 oz fluid, or .845 gm/cm3

http://www.onlineconversion.com/weight_volume_cooking.htm

how much less than 5 gallons did he end up with?

GilSwillBasementBrews said:

General rule of thumb would be 1oz sugar per gallon of beer. That will give you approx. 2.5volumes of CO2.

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Yes, that's what I do. (I HATE those priming calculators because they try to guestimate residual co2 as well as prime to "style" so many people get overcarbed or undercarbed beer!)

I use .75 ounces of corn sugar (dextrose) per gallon of beer for lower carbed styles, and 1 ounce of corn sugar per gallon of beer for more highly carbed styles. It works perfectly for me, and I never have had undercarbed or overcarbed beer, in all these years.

I'm guessing 4.25 gallons.

NickN said:

I'm guessing 4.25 gallons.

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Then 4.25 ounces by weight of corn sugar would be about right.

Unless you really want to make sure you are accurate to style, just go with what you were originally intending. The bottles can take the small difference. Don't make this difficult.