Byte to KB

My grid has a column for the size of the file. I want to convert all the data from Bytes to kilobytes, is there a way to do it?

thanks

http://javascript.internet.com/math-related/byte-converter.html
http://www.activewidgets.com/javascript.forum.25602.14/runtime-computations.html
http://www.activewidgets.com/javascript.forum.20911.7/calculated-columns-cell-formula.html