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.

Next steps in your analysis

Measuring Process Quality: DPMO, First Pass Yield and ReworkHow to quantify process quality with defects per million opportunities, first-pass yield and rework rate — and how a quality scorecard ties them together.

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