Posts tagged ‘90th Percentile’

What is 90th Percentile Response Time?

The 90th percentile response time value is the value for which 90% of the data points are smaller and 10% are bigger.

To calculate the 90th percentile value:

1.       Sort the transaction instances by their value.

2.       Remove the top 10% instances.

3.       The highest value left is the 90th percentile.

Consider the below example:

There are 10 instances of transaction “TRANSACTION 01” with the values

4 sec 2 sec 3 sec 1 sec 5 sec 17 sec 8 sec 7 sec 6 sec 10 sec



1.       Sort values from best to worst:

1 sec 2 sec 3 sec 4 sec 5 sec 6 sec 7 sec 8 sec 10 sec 17 sec



2.       Remove top 10%, In our case i.e. value “17 sec

1 sec 2 sec 3 sec 4 sec 5 sec 6 sec 7 sec 8 sec 10 sec



3.       The highest value left is the 90th percentile value i.e. “10 sec” is the 90th percentile value.