Get compatibility right before calculating cost. Match a supply to the exact model and region, distinguish starter and replacement variants, and read the yield footnotes.
Keep the cost layers visible
Supplies CPP, paper CPP and total ownership answer different questions. Periodic parts and subscriptions should be included deliberately. A declared test yield is not a guarantee for your pages, and document yields do not establish full-coverage photo costs.
Use the cost-per-page tool for a scoped baseline and the monthly tool for an ownership scenario. Both show formulas and exclusions.
Practical guides
Cost per page methodology: yields, color and ownership costs
Calculate and report printing costs without treating estimated pages, photo coverage or starter supplies as guaranteed manufacturer yields.
Ink and toner compatibility: supply codes, region and yield
Verify consumables through official supply codes and regional printer documentation before comparing cost or buying replacements.