With the dimensions I used this feeder easily holds 10 gallons of feed. The slide ramp at the bottom always keeps the food moving from top to bottom and there is never a place for old food to rest and get wasted.brbrHere is the link to my blog post on making one.bra href="" rel=nofollow target=blank is the link to the thread on Backyard Chickens were JT Thorton made the original design.