You can measure fragmentation USING the average clustering ratio or average fragmentation Quotient.

Using the average fragmentation quotient

Any quotient above the high END of the RANGE indicates that REDUCING fragmentation may help performance

Small (up to 200 MB) 60% or higher

Medium (up to 2 GB) 40% or higher

Large (greater than 2 GB) 30% or higher

Using the average clustering ratio:

The average clustering ratio database statistic indicates the fragmentation level of the data (.pag) files. The maximum value, 1, indicates no fragmentation.

You can measure fragmentation using the average clustering ratio or average fragmentation Quotient.

Using the average fragmentation quotient

Any quotient above the high end of the range indicates that reducing fragmentation may help performance

Small (up to 200 MB) 60% or higher

Medium (up to 2 GB) 40% or higher

Large (greater than 2 GB) 30% or higher

Using the average clustering ratio:

The average clustering ratio database statistic indicates the fragmentation level of the data (.pag) files. The maximum value, 1, indicates no fragmentation.