A:Answer Thank you for the question. Based on ISO standards for page yield from all brands- 5% ink coverage - cartridges for the OfficeJet Pro 6978 will yield up to 300 pages from standard black HP 902 cartridges, and up to 315 pages from standard 902 color cartridges. High yield cartridges are available - 902XL cartridges, black and color, will yield up to 750 pages. HP Instant Ink is a great solution for printing pages more heavily inked, as you're charged for the number of pages you print, and not the amount of ink used to print the page.