Environmental Test Chambers & Reliability Labs worked example

Retest Cost at 72% retest cost share: a worked example

This worked example runs the retest cost numbers for a tougher week than the baseline: 72% retest cost share instead of the typical 100%. Estimate retest cost from samples requiring retest, cost per retested sample, retest share, and setup or investigation fees.

The inputs for this scenario

  • Samples requiring retest: 18 samples (held at the documented default)
  • Loaded cost per retested sample: 410 $ / sample (held at the documented default)
  • Retest cost share: 72 % (the input this scenario stresses; the baseline uses 100)
  • Retest setup and investigation fees: 1,600 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable retest cost = samples requiring retest × loaded cost per retested sample × retest cost share.
  • Total retest cost works out to 6,914 $ at these inputs, and this is the headline figure for the scenario.
  • Retest cost per sample works out to 384 $ / sample at these inputs.
  • Variable retest cost works out to 5,314 $ at these inputs.
  • Retest setup and investigation fees works out to 1,600 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where retest cost share sits at 100% and the headline result is 8,980 $, this scenario comes in 23.01% below the baseline at 6,914 $.
  • Use it after a failure to scope a retest change order, or up front to reserve a contingency for expected retest activity in a qualification program. 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

  • Total retest cost: 6,914 $ (headline result)
  • Retest cost per sample: 384 $ / sample
  • Variable retest cost: 5,314 $
  • Retest setup and investigation fees: 1,600 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Retest Cost calculator, set retest cost share to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.