Abrasive Blasting, Shot Peening & Surface Prep worked example

Blast Coverage Completion Rate at 58% target completion for this checkpoint: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target completion for this checkpoint to 58%, then walk the calculation through step by step. Calculate the percent of planned surface area already blasted or ready for coating inspection.

The inputs for this scenario

  • Surface area blasted so far: 1,800 sq ft (held at the documented default)
  • Total area planned to blast: 2,400 sq ft (held at the documented default)
  • Target completion for this checkpoint: 58 % (the input this scenario stresses; the baseline uses 80)

Working through the calculation

  • The calculation starts from the formula this tool documents: Coverage completion = blasted area completed รท total planned blast area.
  • Coverage completion works out to 75 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target works out to -17 points at these inputs.
  • Completed area works out to 1,800 sq ft at these inputs.
  • Planned area works out to 2,400 sq ft at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target completion for this checkpoint sits at 80% and the headline result is 75 %, this scenario lands almost exactly on the baseline at 75 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target completion for this checkpoint, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Square feet completed does not capture quality; area can be blasted but still fail a profile or cleanliness check on inspection.

Results at a glance

  • Coverage completion: 75 % (headline result)
  • Gap to target: -17 points
  • Completed area: 1,800 sq ft
  • Planned area: 2,400 sq ft

Run it with your numbers

  • To rerun this with your own numbers, open the live Blast Coverage Completion Rate calculator, set target completion for this checkpoint to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.