How to calculate the bug rate?

We can calculate the bug rate by depending up on number of test cases passed and the decreased in the rate fall of bugs.

Calcution of how many bugs you found from your Test Cases. Test Cases = 100Bugs Founded = 10Bug Rate = 10%

To make it more clear...

Bug Rate:

No. of Test Caeses Executed / No. of Test Cases failed

Shouldn't it be the reverse???

i.e.

No.of test cases failed / No.of test cases executed

He is saying in percentage and u r saying in fraction, makes the answer one and the same.So both are right.

This one is right:

Bug Rate=No. of Test Caeses Executed / No. of Test Cases failed

Bug rate= No of step test case executed/ No of Fail step

Bug rate = No. of bugs in a given module/Total number of bugs in a project

If you say , Bug rate = total bugs found in software/ total test case exicute in software.
total bugs found
bug rate % that means ,rate%=---------------------------*100 . (10/1000)*100=1%
total test cases run