In Thai, ไกล (klai) means “far” and ใกล้ (klâi) means “near”. Same consonants, same vowel sound. The only thing that separates the two opposites is the pitch of your voice. That is what a tone is: part of the word, as much as its letters are.
Tones are the part of Thai that learners worry about most. They are also more orderly than they look. This post walks through the five tones, the four tone marks, and the one rule that explains why the marks seem to keep changing their minds.
Five tones, one syllable
Thai has five tones: mid, low, falling, high and rising. Take the syllable bpaa and say it five ways, and you get five different words:
| Thai | Romanized | Tone | Meaning |
|---|---|---|---|
| ปา | bpaa | mid | to throw |
| ป่า | bpàa | low | forest |
| ป้า | bpâa | falling | aunt |
| ป๊า | bpáa | high | dad (informal) |
| ป๋า | bpǎa | rising | dad (Chinese-Thai) |
The accents in the romanization draw the pitch for you: no accent for mid, à for low, â for falling, á for high and ǎ for rising.
English speakers already use all five shapes, just for a different job. A flat “okay”, a doubtful “okay?” and a firm “okay!” are mid, rising and falling. In English the pitch carries your mood. In Thai it carries the meaning, so มา (maa, to come) and ม้า (máa, horse) are simply two different words.
Four tone marks
Thai writing has four tone marks, small strokes that sit above the consonant. A syllable with no mark still has a tone; it is just not written down.
| Mark, on ก | Name | Example |
|---|---|---|
| ก่ | ไม้เอก · mái ek | ไก่ · chicken |
| ก้ | ไม้โท · mái tho | ไม้ · wood |
| ก๊ | ไม้ตรี · mái tri | โต๊ะ · table |
| ก๋ | ไม้จัตวา · mái chattawa | ก๋วยเตี๋ยว · noodles |
Five tones and four marks would be a tidy system if each mark stood for one tone. It does not, and this is where most learners get stuck.
The one rule: the consonant decides
Look at these two words. Both carry the same mark, ไม้เอก:
ข่า (khàa, galangal) is a low tone.
ค่า (khâa, value or cost) is a falling tone.
The mark is the same. What differs is the consonant underneath it. Every one of the 44 Thai consonants belongs to one of three classes — mid (9 letters), high (11) or low (24) — and the class decides what a tone mark does. ข is a high-class letter; ค is a low-class one. They make the same kh sound, and that is the point: having both lets Thai write different tones.
| Class | No mark | ไม้เอก | ไม้โท |
|---|---|---|---|
| Mid | ปา mid | ป่า low | ป้า falling |
| High | ขา rising | ข่า low | ข้า falling |
| Low | คา mid | ค่า falling | ค้า high |
The other two marks, ไม้ตรี and ไม้จัตวา, are the easy ones. They are used with mid-class consonants and always mean high and rising, as in ป๊า and ป๋า above.
So a high-class consonant with no mark already rises: ขา (khǎa, leg), หา (hǎa, to look for), หู (hǔu, ear). Add ไม้โท to หา and you get ห้า (hâa), the number five.
Short syllables have their own tones
One more thing shapes the tone: how the syllable ends. A syllable with a long vowel, like the ones above, is called live. A syllable that stops short is called dead, and it takes a different tone even with no mark at all:
| Class | Long vowel | Short vowel |
|---|---|---|
| Mid | กา gaa · mid | กะ gà · low |
| High | สี sěe · rising | สิ sì · low |
| Low | มา maa · mid | ละ lá · high |
That is the whole system: consonant class, syllable type, tone mark. Three questions, asked in that order, give you the tone of any Thai syllable.
How to actually learn them
Ears first. You cannot say a tone you cannot hear. Before any rule, listen to the five tones side by side on one syllable until you can name each of them. This takes less time than people expect.
Learn the tone with the word. Thai children do not work out tone rules before they speak. Treat the tone as part of the word’s sound, the same way you learn that “record” the noun and “record” the verb are stressed differently. ข้าว (khâao, rice) and ขาว (khǎao, white) are not one word with two tones. They are two words.
Learn the classes with the alphabet. The consonant class is far easier to pick up while you are meeting each letter for the first time than to bolt on afterwards. Start with the nine mid-class letters; they follow the simplest pattern and take all four marks.
Use the rules for reading, not for speaking. The three questions are how you find the tone of a word you have never seen. In conversation, the words you already know should come out with their tones attached.
Where Sawasdee comes in
In Sawasdee, every consonant is taught together with its class, and unit 5, The 5 Tones, is part of the free course. Tone reading cards show one syllable across the tones, like ปา, ป่า and ป้า above, and the Tone Trainer game plays a word and asks you to name its tone, again and again, until your ear does it without thinking.
If you are new to the script itself, start with Learning Thai, One Letter at a Time.
Train your ear for Thai tones
The first units are free, including The 5 Tones. No account required.