I think this one is very helpful--easy to read layout.

http://www.medfriendly.com/standardscoretopercentileconversion.html

I posted this in the General Schools discussion, but realize that perhaps FCPS parents are more likely to have this information. Does anyone know how to find the chart that links up FSIQ on the WISC-IV with a percentile? I have seen this before but cannot locate it now. TIA.