Carboy Volume??????

HOw is this measured?

I aske because I have a 6.5 gallon carboy that can hold almost 7.5 gallons of water. And my 5 gallon carboy can only hold about 5.25 gallons of water. DOes this make any sense?

 

Most people fill theirs up a quart at a time and mark the graduations on the side with a marker or a china marker or tape.

 

I have marked mine with a sharpie marker every gallon. I was more curious about how the manufacturer determines the what the capacity is.

I guess what im asking is why can a 6.5 gallon carboy hold more than 6.5 gallons?

 

Consider it the 2x4 of brewing.

 

what does that mean?

 

In that a 2x4 really isn't 2"x4".

 

oopsy

 

I find the advertised volume of the carboy is usually to the shoulder ... As it starts to curve in to the neck. Maybe a little above or below.

 

same reason my shoe size is 10.5 for sneakers, but 11 for boots... manufacturer variations.

i have 6 gallon carboys that are 6 gallons up to the very top, and i have 5 gallon carboys that are 5.25 gallons up to the shoulder. just depends on where you measure from. everyone does it differently.