Per cartridge. Tested in HP Deskjet 5550 Color Inkjet Printer. Average based on ISO/IEC 24711 or HP testing methodology and continuous printing. Actual yield varies considerably based on content of printed pages and other factors. For details see http://www.hp.com/go/learnaboutsupplies.
HP Deskjet 3320, 3325, 3420, 3425, 5550, 5551 and 5552 Printers, HP Deskjet 450 Mobile Printer, HP Photosmart 7150, 7350, and 7550 Printers, HP PSC 2105, 2108, 2110, 2150, and 2210, amd HP Officejet 6110