How do you calculate blast coverage completion rate?

Divide the area blasted so far by the total planned area. For 1,800 sq ft of 2,400 sq ft planned, that is 75% complete.

What does the gap to target mean?

It is your target completion minus actual completion, in percentage points. At 75% actual against an 80% target, the gap is 5 points behind.

What is a good blast coverage completion rate?

A good rate is one that meets or beats your checkpoint target with zero or positive gap. Being 5 points behind, as in the example, is a manageable shortfall but warrants a look at crew count or nozzle uptime before it compounds.

Coverage completion vs blast coverage profile, what's the difference?

Completion rate is about how much area is done; surface profile (the anchor pattern depth) is about whether that area is done correctly. This calculator measures progress, not anchor profile in mils.

How do I set the target completion percentage?

Divide the schedule so each checkpoint has an expected percent complete. If the blast is meant to be 80% done by end of day three, enter 80 as your target for that checkpoint.

Why track completion separately from media or air calculators?

Media and air tell you what a job consumes; completion tells you whether you are on schedule. A crew can be on-budget for abrasive yet behind on coverage if nozzle downtime is eating productive blast time.

Abrasive Blasting, Shot Peening & Surface Prep calculator

Blast Coverage Completion Rate Calculator

Blast coverage completion rate is the share of a planned blasting job that has actually been brought to profile, measured against where you expected to be. Blast supervisors and project coordinators use it to run a daily or shift-by-shift progress check on coatings work, where the blast must be finished and inspected before primer can flash. By comparing actual coverage to a target, it turns a vague sense of "we're getting there" into a hard points-behind number you can report to a coating inspector or general contractor. It is the simplest early-warning signal that a blast crew is slipping against the schedule.

What this calculator does

Calculate the percent of planned surface area already blasted or ready for coating inspection.
a blasting crew needs a quick percent-complete number from measured square footage instead of a rough visual guess
It computes the percentage of the planned blast area completed and the gap, in percentage points, to your checkpoint target.

Formula used

Coverage completion = blasted area completed ÷ total planned blast area
Gap to target = target completion - coverage completion

Inputs explained

Surface area blasted so far:
Total area planned to blast:
Target completion for this checkpoint:

How to use the result

Use it at shift change or daily standup to gauge whether the blast phase is keeping pace with the coating schedule.
Square feet completed does not capture quality; area can be blasted but still fail a profile or cleanliness check on inspection.

Common questions

How do you calculate blast coverage completion rate? Divide the area blasted so far by the total planned area. For 1,800 sq ft of 2,400 sq ft planned, that is 75% complete.
What does the gap to target mean? It is your target completion minus actual completion, in percentage points. At 75% actual against an 80% target, the gap is 5 points behind.
What is a good blast coverage completion rate? A good rate is one that meets or beats your checkpoint target with zero or positive gap. Being 5 points behind, as in the example, is a manageable shortfall but warrants a look at crew count or nozzle uptime before it compounds.
Coverage completion vs blast coverage profile, what's the difference? Completion rate is about how much area is done; surface profile (the anchor pattern depth) is about whether that area is done correctly. This calculator measures progress, not anchor profile in mils.
How do I set the target completion percentage? Divide the schedule so each checkpoint has an expected percent complete. If the blast is meant to be 80% done by end of day three, enter 80 as your target for that checkpoint.

Last reviewed 2026-05-12.