A:Answer Approximately 20,000 However I have used it in my insurance office as the main printer and have gone about 10 months without having to replace the cartridge. I would guess that it was around 25,000 to 30,000. I am on my second black cartridge in right at two years and am getting ready to order another one. With my Brother Laser I had to keep extra cartridges on hand because I had to replace them so often. Hope that helps.
