How to read Thai

Thai is an abugida: every consonant carries an inherent vowel, and the written vowel modifies it. That single fact explains most of what looks strange about the script. Vowels are not letters in a line — they are marks that attach above, below, before, after or around their consonant, and one vowel can occupy two of those positions at once.

There is no upper and lower case, no full stop, and no space between words — spaces mark clause and sentence breaks instead. Reading runs left to right, but a pre-posed vowel is written before the consonant it is pronounced after, so the reading order and the writing order genuinely differ. Learning to see the syllable, rather than the letter, is the whole skill.

Every consonant has a name that pairs the letter with a reference word — ก is ko kai, “ko as in chicken”. Thai children learn the letters by the word, and so should you: it disambiguates the several letters that share a sound.

The 44 letters are split into three classes — mid, high and low. The class is a property of the letter, not of its sound, and together with the vowel length and any tone mark it decides the tone of the syllable. This is the one piece of bookkeeping Thai asks of you, and it is why the plate below is coloured rather than alphabetised.

The full consonant reference

Start with the after-consonant vowels — ◌ะ, ◌า and their family — because they sit where an English reader expects a vowel to sit. Then take the above and below marks, then the pre-posed vowels that are written first and read second, and finally the split forms that surround the consonant on both sides.

Each pattern is either short or long, and the difference is phonemic: it changes the word, and it changes the tone rule that applies. The 33 patterns fall into 17 families, which is a far smaller thing to memorise than the raw list.

The full vowel reference

Thai is tonal: the same syllable said at a different pitch contour is a different word. There are 5 tones, and only 4 marks to write them with — so the marks alone cannot be the answer.

The tone of a syllable is decided by three things together: the class of the initial consonant, whether the syllable is live or dead, and which tone mark, if any, is present. It is a lookup, not a judgement call, and after a few hundred syllables it stops feeling like one.

The full tone rule matrix

A Thai syllable is initial consonant + vowel (+ final consonant). Decode it in that order: find the initial and note its class, find the vowel and note its length, check for a final, decide live or dead, then apply the tone rule.

A live syllable ends in a long vowel or a sonorant final. A dead one ends in a stop, or in a short vowel with nothing after it. Thai collapses many written finals onto a handful of spoken ones, which is why the plate below groups the letters by the sound they actually make at the end of a syllable rather than by their name.

Thai Script Master runs the material above as 94 lessons in 9 phases, from shape recognition to B2 reading. Phase 1 does not start with the alphabet: it starts with the vowel shapes, because those are what make an unfamiliar word unreadable even when you know every letter in it.

Each phase closes on a stated milestone rather than a score, and each lesson ends with a short test you have to pass before it counts. The plate below is the real curriculum, phase by phase.