| Short | Tamil | அ | இ | உ | எ | ஒ |
| ISO transliteration | a | i | u | e | o | |
| Long | Tamil | ஆ | ஈ | ஊ | ஏ | ஒ |
| ISO transliteration | ā | ī | ū | ē | ō | |
| Diphthongs | Tamil | ஐ | ஔ | |||
| ISO transliteration | ai | au |