Defect Density

There are various ways of calculating defect density


The formula itself is simple: Density = Total Defects Found / Size 

if we see defect density at granular level say Code size of a particular functionality X in a application Y along with number of files, then we may draw some good observations like -

Taking an example here:- Lets say we have an application ABC, which have three functionality/modules A, B and C.
Code files for A =10 and KLOC=5k
Code files for B =5 and KLOC=1k
Code files for C =1 and KLOC=25k
Bugs found in A=40, B=50, and C=5

Defect density = Total number of defects/LOC (lines of code)

Defect density = Total number of defects/Size of the project 

Size of Project can be Function points, feature points, use cases, KLOC etc 

Defect Density can be used to: 

1) Predict the remaining defects when compared to the expected defect density, 

2) Determine if the amount of testing is sufficient. 

3) Establish a database of standard defect densities.


Vinay Jagtap

A hard core Technocrat with over a decade of extensive experience in heading complex test projects coupled with real time experience of project management and thought leadership. Extensive experience in Performance, Security and Automation Testing and development of automation frameworks and ability to setup and execute Global service centers and Center of Excellences for testing.

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