Begin with the supplies price divided by the matching declared yield, then explain the scope. That quotient is a planning baseline, not a promise about your documents. Keep supplies cost, paper cost and total ownership separate so the comparison remains understandable.
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The baseline formula
For one supply, baseline CPP = replacement supply price ÷ its declared printed-side yield. A hypothetical $60 cartridge with a 3,000-side yield gives $0.02 per side. That example excludes paper, hardware, periodic parts, waste, tax and shipping. None of those inputs represents a named manufacturer’s current price.
Match the yield to the product
- Use the exact supply code and country edition.
- Distinguish starter or included supplies from replacements.
- Record the declared test method and relevant footnotes.
- Keep monochrome document yields separate from composite color yields.
- Do not turn a document yield into full-coverage photo yield.
- Do not equate a volume of ink in milliliters with a page count.
Color requires a consistent method
When using separate color supplies, the cost basis must match the manufacturer’s yield definition. If you have individual comparable per-color yields, document how each price/yield term contributes. If the manufacturer declares a composite set yield, keep that set definition intact. Do not add incompatible yield numbers, multiply a composite yield by the number of colors or assume every document consumes the same channel mix.
Periodic parts and paper
A separate drum, maintenance box or other periodic part can change the supply budget. Use its documented life and explain the basis; job length and actual use may affect it. The calculator accepts one optional periodic-part allocation. For several parts, calculate the separate allocations and combine them transparently outside the single input.
Paper cost per printed side equals cost per sheet divided by the average printed sides per sheet. Duplex changes that allocation but does not halve the ink needed for the same number of printed sides. If you apply a waste factor, say whether it means unusable output as a share of total output. Our formula uses total cost ÷ (1 − waste share), so 10% wasted output differs from simply adding 10%.
Ownership and cash flow are different
Allocating the printer purchase over months helps compare ownership, but the actual payment happens upfront. Supplies are purchased in whole packs. Subscription fees and included page allowances require their own terms and should not be silently substituted for a cartridge-price formula. Electricity or service costs can be added where you have evidence, not a universal guessed amount.
Publish the assumptions
Report price date, currency, region, supplies, yields, paper, workload, period and exclusions alongside the result. Label measured output only when you have a real log. Our CPP tool and monthly estimator use your inputs; their defaults are arithmetic illustrations.
Sources and scope
Official references checked October 6, 2026. Model manuals apply to their named US edition; they do not establish support on another printer. The decision examples and workflow checklists are our editorial analysis. No physical printer test was performed for this guide.