Rework Rate Calculator
Find what percentage of units required rework.
How rework rate works
Rework rate is the percentage of units that required correction before they could pass inspection or be shipped — a direct measure of hidden quality cost that a final-yield number alone doesn't show.
Enter the number of units that required rework and the total units processed. The calculator returns the rework rate as a percentage.
Rework rate and First Pass Yield (a related calculator) are two views of the same underlying issue — use them together to see both the scale of the problem and its cost impact.
The formula
Rework rate = Units requiring rework ÷ Total units × 100
Divide the number of units that required rework by the total number of units, then multiply by 100.
Worked example
25 units required rework out of 500 total
25 ÷ 500 × 100 = 5% rework rate.
Frequently asked questions
What should count as "rework"?
Any unit that failed inspection or test and needed correction before it could pass — define this consistently across periods so trends are comparable.
How does rework rate relate to cost?
Rework typically consumes extra labor, materials and time beyond the original process cost — many quality programs track the dollar cost of rework alongside the rate itself.
Is a low rework rate always good?
Generally yes, but verify it isn't achieved by shipping defects instead of catching and reworking them — check rework rate alongside customer-reported defect rates.
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