K-factor locates the neutral axis through sheet thickness. Inputs must describe the same finished bend and use compatible length units.
Use the result as a calculation aid within that scope. Test a nearby input when measurement or forecast uncertainty matters; the resulting range is usually more honest than one precise-looking value. Preserve enough digits during intermediate work and round only when reporting.
A useful manual check: write the input with its unit, carry the unit through each operation, and ask whether the direction of change makes sense. For Sheet-Metal K-Factor Calculator, the formula is K=[BA/θ−R]/T, with θ in radians. Neutral-axis radius=BA/θ. Try a simple boundary or round-number case before relying on a less familiar value. This catches reversed factors, misplaced percentages and unit labels that arithmetic alone cannot identify.
When the number is used elsewhere: copy the unit and assumptions beside it. A spreadsheet, report or message that contains only the final digits loses the information needed to reproduce the work. If another person supplies the input, confirm whether it is measured, estimated, nominal or already rounded. Those distinctions can matter more than another decimal place.
Practical boundary: this calculator is meant to derive neutral-axis K-factor from bend allowance, angle, radius and thickness. It does not silently adjust for conditions that are not represented by a field. If the real question involves changing rates, mixed substances, clinical judgment, equipment tolerances, dependent events or a different unit definition, use a method that explicitly includes those facts.
The output does not add facts that were absent from the inputs. It cannot establish a diagnosis, guarantee an investment outcome, certify equipment, or override an official measurement or document.
