How the script works
Thai is an abugida: each written unit is built around a consonant, and the vowel is attached to it — sometimes before, after, above, or below. Add an optional tone mark and you get a syllable. Written Thai runs words together with no spaces; spaces mark phrase or sentence boundaries instead.
- Consonants: 44 letters (42 in active use). Each has a class — mid, high, or low — that helps determine the tone.
- Vowels: 32 forms, written before/after/above/below the consonant. Vowel length (short vs. long) changes meaning.
- Tone marks: four marks placed above, working together with consonant class to give the five tones.
- No spaces between words: sentences look like one long stream at first. You learn word boundaries with vocabulary.
Consonants at a glance
Every consonant belongs to a class — mid, high, or low — and the class combines with vowel length and tone marks to determine the tone. You don't need to memorize all 44 at once; start with the common ones.
| Thai | Sound | Class | English note |
|---|---|---|---|
| ก | g / k | Mid | Between English g and k — like "skate" |
| จ | j / ch | Mid | Unaspirated ch, as in "match" |
| ด | d / t | Mid | Between d and t — like "stand" |
| ต | t | Mid | Unaspirated t |
| บ | b / p | Mid | Between b and p — like "spa" |
| ป | p | Mid | Unaspirated p |
| อ | vowel carrier / glottal | Mid | Silent placeholder for vowels alone |
| ข | kh | High | Aspirated k — strong puff of air |
| พ | ph | High | Aspirated p (NOT "f") |
| ท | th | Low | Aspirated t (NOT "th" in "think") |
| ม | m | Low | As in English |
| น | n | Low | As in English |
| ง | ng | Low | Like "singer" — can start a syllable |
| ร | r | Low | Trilled or rolled r |
| ล | l | Low | As in English |
| ว | w | Low | As in English |
| ห | h | High | Also marks tone on low-class pairs |
Thai distinguishes aspirated (puff of air) from unaspirated consonants — English mostly doesn't. "ph" and "th" in romanization mean aspirated p/t, never f or the English th.
Vowels at a glance
Thai vowels come in short/long pairs, and length changes meaning. In the table, ◌ marks where the consonant goes.
| Form | Sound | Position | English note |
|---|---|---|---|
| ◌า | aa | after | Long "a" in "father" |
| ◌ะ | a | after | Short — same sound, cut short |
| ◌ิ / ◌ี | i / ii | above | Like "machine" — short and long |
| ◌ึ / ◌ื | ue / uue | above | Central vowel — no English equivalent |
| ◌ุ / ◌ู | u / uu | below | Like "flute" — short and long |
| เ◌ / เ◌ะ | ee / e | before | Like "grey" / "get" |
| แ◌ / แ◌ะ | ae | before | Open — like "cat" / "bed" somewhere between |
| โ◌ / โ◌ะ | oo / o | before | Like "go" / short "got" |
| เ◌า | ao | before+after | Like "cow" |
| ไ◌ / ใ◌ | ai | before | Like "eye" |
| เ◌ีย | ia | combination | Like "dear" glide |
| เ◌ือ | uea | combination | ue + a glide |
| ◌ัว | ua | around | Like "tour" glide |
Long and short vowels are different phonemes: มา (maa, come) vs a short vowel version would be a different syllable. Duration matters as much as the sound itself.
Tone marks
Four written tone marks appear above the syllable's initial consonant (or vowel):
| Mark | Name | What it does |
|---|---|---|
| ◌่ | mai ek | Changes tone (usually → low) |
| ◌้ | mai tho | Changes tone (usually → falling) |
| ◌๊ | mai tri | High tone (mid-class consonants) |
| ◌๋ | mai chattawa | Rising tone (mid-class consonants) |
The tone you actually get = consonant class + mark + vowel length. The full logic lives in the tones article — you don't need to decode it on day one.
Read the tones next: the five tones of Thai.
Mini practice
Q1. Where can a Thai vowel appear relative to the consonant?
Before, after, above, or below — each vowel has a fixed position you learn with the vowel itself.
Q2. In romanization, what do "ph" and "th" mean in Thai?
Aspirated p and t (with a puff of air) — never "f" or the English "th".
Q3. Does Thai put spaces between words?
No — spaces separate phrases or sentences, not words.
Q4. What decides a syllable's tone?
Consonant class + tone mark + vowel length + syllable type, all together.
Q5. What is the letter อ used for?
It's a silent vowel carrier (glottal-stop onset) so a syllable can start with a vowel sound.
Summary
- Thai is an abugida: consonants + attached vowels + tone marks.
- 44 consonants in 3 classes; 32 vowel forms in short/long pairs.
- No spaces between words — you learn boundaries through vocabulary.
- Next: the alphabet & romanization.
