They will either evaluate your transcripts and convert it themselves or they will take your attempt at conversion in good faith. Columbia, for instance, asks you to convert and then to just "show your work." You can use the unofficial WES and then just refer to that.
Paul Lanzillotti | Founder| About | firstname.lastname@example.org | 877.866.9251
Schedule a Consultation | Twitter | Blog
Download "How To Apply" Guides | INSEAD | Columbia | Harvard | Wharton