How To Pronounce Since

In British English, since is pronounced /sɪns/. The narrow phonetic transcription is [sɪ̃ns]. In American English, it is pronounced /sɪns/.

Since 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.