Defect Rate Calculator
Use the Defect Rate Calculator for business planning. Enter Defective units and Total units to get a clear result, formula explanation, and practical checks.
Defect Rate measurements
Enter your values, then calculate.
Result
How to calculate defect rate
Defect rate measures what percentage of produced units are defective — a core manufacturing quality metric.
How the calculation works
Defect rate = (Defective units ÷ Total units) × 100.
Example
18 defective units out of 900 produced: (18÷900)×100 = 2%.
Frequently asked questions
How is Result calculated?
Result = ([Defective units] ÷ [Total units]) × 100.
Is the Defect Rate Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Defect Rate Calculator
Defect rate = (Defective units ÷ Total units) × 100.
Let's understand your defect rate result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Defect Rate
- Track defect rate by production line or shift to isolate where quality issues concentrate.
- A rising defect rate trend is worth investigating before it grows into a larger quality problem.
Common Defect Rate Mistakes to Avoid
- Looking only at an aggregate defect rate without breaking it down by line or product, which can hide a specific fixable issue.
When to Use This Calculator
Defect rate measures what percentage of produced units are defective — a core manufacturing quality metric.