This page teaches controlled sound targets from our reviewed catalogue. It does not claim one universal whole-word IPA transcription: the sounds in a word can vary by speaker and target variety.
Reviewed sound focus
/r/
Received Pronunciation (British) · Cockney (British) · General American
American R: tongue tip curled back (or bunched up), lips slightly rounded. Don't trill.
Common slip: Don't roll/trill the R. American R is smooth — like the start of a /w/.