Corrective Action Effectiveness Calculator

Work out corrective action effectiveness instantly with clear inputs, formula shown and shareable results.

About Corrective Action Effectiveness Calculator

Effectiveness is the proportional reduction in defect rate after the corrective action. Verification requires enough post-action volume to distinguish the improvement from noise, and the residual rate matters as much as the reduction — an 80% cut that still leaves a significant defect stream is not a closed problem.

Formulas

Effectiveness

Effectiveness % = (rate before - rate after) x 100 / rate before

Saving

Annual saving = (rate before - rate after) x annual volume x cost per defect

Worked example

With the default values below, Corrective Action Effectiveness Calculator returns Corrective Action Effectiveness of 80.95%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Defect Rate Before Actionminimum 0 %: 4.2 %
Defect Rate After Actionminimum 0 %: 0.8 %
Annual Volumeminimum 0.01: 250,000
Cost Per Defectminimum 0: 950

Results

Corrective Action Effectiveness: 80.95%
Defects Avoided Per Year: 8,500.0
Annual Saving: $8,075,000.00
Residual Defects Per Year: 2,000.0

Step by step

1Values used
2Effectiveness
3Saving
4Corrective Action Effectiveness= 80.95
5Defects Avoided Per Year= 8,500.0
6Annual Saving= 8,075,000.00
7Residual Defects Per Year= 2,000.0

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation or tax into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How much data is needed to verify a corrective action?

Enough that the expected number of defects at the old rate would be at least five to ten. Declaring success after a handful of good units is the commonest cause of recurrence.

What if the rate rebounds later?

That means the containment worked but the root cause was not eliminated, or the fix depended on attention that has since lapsed. Actions that rely on vigilance rather than design rarely hold.