HP publishes page yield data based on the industry standard for measuring cartridge yields (ISO/IEC 24711). Under the ISO 24711 testing guidelines, a standard set of five 8 1/2 x 11 pages are printed continuously until the cartridge reaches end-of-life. For a variety of reasons, these testing conditions may not reflect what you experience in everyday use. ISO standard page yields therefore should be used only as a starting point for comparison purposes, and not to predict the actual yield you will get from your HP printer and cartridge. Actual yield varies considerably based on the content of printed pages, frequency of printing, and other factors. Click here for more information about page yield and ink volume. Click here for information about how ink is used.