37"X18"X18". Linnies need a longer cage than tall, so I got a double breeder cage and removed the divider. The dowel rod (which I wouldn't normally use) is there to cover the track for the divider. I cut one of the dowels it came with to fit. I wouldn't recommend this particular cage though because there were several rough spots in the coating that I had to sand down due to concern for her sweet little feets. Thankfully they were in places she doesn't need to access, like under the newspaper, on the divider grate, and in the right hand door, which will remain closed. I had already returned another cage which was unusable due to the bars being welded unevenly. This one, at least, isn't going to be a strangulation risk. If she starts ripping up the newspaper I'll have to vet tape the bottom grate to make sure she doesn't get near the sanded spots. So far she's been happy to stick with her toys.