Calculate actual pages per cartridge from your own replacement records and compare with a reference yield.
Real-World Yield Calculator
Formula
How to use the result
Use a long enough period to smooth partial cartridges and keep the cartridge type and device population consistent.
What the calculator does not know
These calculators are general financial and operational planning aids. Lease terms, meter definitions, taxes, service inclusions, security requirements, privacy obligations, electrical requirements and manufacturer specifications vary. Read the actual contract and manufacturer documentation and use qualified technical or legal advice where needed.
Improve the estimate
Keep the inputs used for the decision and compare the estimate with actual results. A simple calculator is most useful when it makes the assumptions visible enough to learn from the difference.