Declared length and physical fit answer different questions

Keep the numerator and denominator honest

Length-price arithmetic uses the quantity sold and the declared length per roll. It does not use outside diameter as a proxy. An uncertain length cannot support a claimed exact cost per foot.

Do not assume equal paper thickness

Different stock can place a different amount of paper within the same outside circle. We have not measured caliper or winding tightness for the featured offers, so no yield is inferred from roll photographs.

Separate expected use from tested yield

A business can use its own records to estimate how long a roll lasts. We do not invent transactions per roll or a standard receipt length. Those assumptions belong in a scenario, with their limits visible.

Before you decide

• Use declared length
• Keep OD as a fit field
• Do not invent transactions per roll