Building Materials Manufacturing worked example

Glass Defect Rate at 2.16% maximum allowed glass defect rate: a worked example

This worked example runs the glass defect rate numbers for a tougher week than the baseline: 2.16% maximum allowed glass defect rate instead of the typical 3%. Calculate the glass defect rate from inspected production and rejected or defective glass.

The inputs for this scenario

  • Defective glass lites, containers, or tons found: 35 defects or tons (held at the documented default)
  • Total glass inspected in the same period: 1,000 lites, containers, or tons (held at the documented default)
  • Maximum allowed glass defect rate: 2.16 % (the input this scenario stresses; the baseline uses 3)

Working through the calculation

  • The calculation starts from the formula this tool documents: Glass Defect Rate = defective glass lites, containers, or tons found ÷ total glass inspected in the same period × 100.
  • Glass Defect Rate works out to 3.5 % defect rate at these inputs, and this is the headline figure for the scenario.
  • Glass Defect Rate gap to target works out to -1.34 points at these inputs.
  • Defective glass lites, containers, or tons found works out to 35 count at these inputs.
  • Total glass inspected in the same period works out to 1,000 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where maximum allowed glass defect rate sits at 3% and the headline result is 3.5 % defect rate, this scenario lands almost exactly on the baseline at 3.5 % defect rate.
  • Use it per shift, line, or inspection batch to track whether glass quality is holding inside the target defect ceiling. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Glass Defect Rate: 3.5 % defect rate (headline result)
  • Glass Defect Rate gap to target: -1.34 points
  • Defective glass lites, containers, or tons found: 35 count
  • Total glass inspected in the same period: 1,000 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Glass Defect Rate calculator, set maximum allowed glass defect rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.