How To Pronounce Twelfth

In British English, twelfth is pronounced /twelfθ/. The narrow phonetic transcription is [tʷw̥eɫfθ]. In American English, it is pronounced /twelfθ/.

Twelfth 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.