Turn a print job into a reviewable cost record. Separate attempted printed sides, useful output and the cost layers you actually include. Download the inputs and result for the next run.
How to use the result
Choose whether the cost entries are observed purchases, job allocations or a mix, and state that basis in the notes. Use the same currency throughout. Enter printed sides rather than physical sheets; a duplex sheet can contribute two sides. Include proofs and rejects in attempted sides if they belong to the job scope.
Worked reference case
A job attempts 110 sides and retains 100. Supplies cost 3.30, paper 1.10 and other included costs 1.10 in the same currency. Total included cost is 5.50 and cost per useful side is 0.0550. Ten rejected sides out of 110 attempts is 9.09%; the extra attempts per useful side are 10%. Those percentages differ because their denominators differ.
Formulas and boundaries
Total cost = supplies + paper + other included cost. Cost per useful side = total cost ÷ retained useful sides. Reject share = (attempted − useful) ÷ attempted. Extra attempts per useful side = attempted ÷ useful − 1. The form rejects zero useful output and impossible counts rather than returning a misleading cost.
The workbook does not measure cartridge depletion, allocate mixed-use supply purchases automatically or infer yield from a printer counter. Add taxes, maintenance, purchase cost or finishing only when they belong to the comparison, and name omissions. A supply-only calculation and a full ownership model answer different questions.
Keep and review the record
Calculate a valid result before downloading JSON or CSV. Downloads contain the current calculated inputs, configuration notes and results. If you edit inputs after calculating, calculate again before saving. The record is a decision aid, not a certificate. Do not put passwords, private addresses or unrelated personal data into the notes.
Verification and evidence
The workbook arithmetic is checked with reference and invalid-input cases in the release source. These are software checks, not physical product tests or a measurement of encoder quality. AI assisted drafting and implementation. The original formulas, constraints and worked examples are visible here so a reader can audit the result.
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Browse all guides and editable worksheets · Published library update record
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