Cartridge life is measured in pages
Ink cartridge yields come from a standard test, ISO/IEC 24711, which prints a fixed set of pages on plain paper until the cartridge runs out. HP, Epson, and other major brands publish yields measured this way, so you can compare cartridges across brands on the same basis.
To turn a yield into a schedule, divide it by how many pages you print. A 300-page cartridge at 20 pages a week lasts about 15 weeks.
Why your cartridge runs out sooner than the box says
The standard test pages are mostly text with modest color. Your real printing can use far more ink:
- Photos and full-page graphics use many times more ink than a text page.
- Inkjet printers also spend ink cleaning the printhead, so printing a few pages at a time over many weeks gets fewer pages per cartridge than the test does.
- XL or high-yield cartridges hold more ink for the same printer and usually cost less per page if you print regularly.
Inkjet vs. laser toner
Laser toner is dry powder that doesn't evaporate or clog, so a toner cartridge often lasts months longer than an inkjet cartridge at the same print volume. Ink-tank printers (like Epson EcoTank and Canon MegaTank) refill from bottles, and one set of bottles often lasts a year or more. This calculator covers cartridges, not tanks.