You all know my position on age-equivalents already, and I would really recommend the percentile approach for advocacy ("if you lined up a million six-year-olds based on their ability to perform on this test of verbal ability, he would be first in line, but if you lined up a million six-year-olds based on their paper-and-pencil processing speed, he would be 840,000th in line" (or wherever his actual percentile would place him))...but if you really want age- or grade-equivalents, I can get you the real ones for the WISC-IV, if you have the raw scores for the subtests. There is a table in the manual.

...pronounced like the long vowel and first letter of the alphabet...