Enter the number of defects found internally and the number of defects found externally into the Defect Removal Efficiency Calculator. The calculator will evaluate the Defect Removal Efficiency.

- Defect Rate Calculator
- DPMO Calculator (Defects Per Million Opportunities)
- Rejection Percentage Calculator

## Defect Removal Efficiency Formula

The following two example problems outline the steps and information needed to calculate the Defect Removal Efficiency.

**DRE = DI / (DI + DE) * 100**

Variables:

- DRE is the Defect Removal Efficiency (%)
- DI is the number of defects found internally
- DE is the number of defects found externally

## How to Calculate Defect Removal Efficiency?

The following steps outline how to calculate the Defect Removal Efficiency.

- First, determine the number of defects found internally.
- Next, determine the number of defects found externally.
- Next, gather the formula from above = DRE = DI / (DI + DE) * 100.
- Finally, calculate the Defect Removal Efficiency.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

number of defects found internally = 300

number of defects found externally = 80

DRE = DI / (DI + DE) * 100** **= ?