All page yields are based on 5% coverage which is the industry standard as established by the International Organization for Standardization (ISO). Learn more... However, it's a little misleading as 5% of a page is actually very little print - about the size of a small memo. For example, if you're printing on 50% of the page, the expected page yield would be a tenth (10%) of the stated page yield. So your page yield will most likely be less than the stated yield - no matter where you buy the cartridge - as everyone's yields are all based on only 5% coverage.