I bought 4l can of Behr Premium Plus Interior Flat ceiling paint to repaint my master bedroom ceiling. For ease of calculation, the room is 20 by 12(240sq. ft), I used a 10mm, 9 inch roller and put on one coat and had to skimp on the last roller applications. The ceiling was already painted some years before with exactly the same paint. The next morning I had to then buy a second can at exactly the same price as the first and missed out on the almost 50 % sale when two cans are bought at the same time. The can says 250 to 400 sq. ft.. The paint doesn't live up to its advertising. I bought four more cans (16L) eggshell in a light blue, to cover previous painted yellow walls. It took three coats. I have always benn happy with Behr Premium Plus but maybe its time to try something new.