How To Pronounce All

In British English, all is pronounced /ɔːl/. The narrow phonetic transcription is [ɔːɫ]. In American English, it is pronounced /ɔːl/.

All has one syllable. British and American speakers say it the same way.

Slashes / / show the phonemic transcription, the sounds that change meaning. Square brackets [ ] show the phonetic transcription, with the finer detail of how the sounds are actually made.