Five Tones

Foundations

Standard Thai has five lexical tones: mid, low, falling, high, and rising. Tone is part of a word’s sound pattern, along with its consonants and vowels. Words with the same consonants and vowels can have different meanings when their tones differ.

How It Works

Standard Thai has five lexical tones. A tone can distinguish words whose consonants and vowels are otherwise the same. The familiar tone names describe contrasts in relative pitch and pitch movement, rather than five fixed musical notes. The descriptions below are broad guides for clear citation readings; actual contours can vary with the speaker and surrounding speech.

1. The Five Tone Categories

  • Mid (สามัญ): Relatively level around the middle of the speaker’s pitch range.
  • Low (เอก): Relatively low; it need not be perfectly level.
  • Falling (โท): Moves from a higher part of the range toward a lower part.
  • High (ตรี): Ends relatively high and can have a rising movement.
  • Rising (จัตวา): Moves upward from a low part of the range.

In คา ข่า ข้า ค้า ขา, the same consonant and long vowel occur with the five tones in that order.

2. Reading An Unmarked Syllable
A syllable without a tone mark still has a tone. In ordinary Standard Thai spelling rules, use the consonant class, vowel length, and whether the syllable is live or dead. The traditional consonant inventory is divided into high, mid, and low classes. Class names describe a spelling group; a high-class letter does not necessarily produce a high tone. Identify the final sound, rather than relying on the last written letter alone. Endings in m, n, ng, y, or w are live; endings in p, t, or k are dead. In the citation readings covered by these rules, a short vowel without a written final consonant ends in a glottal stop and is dead; a long vowel without a final consonant is live. With no tone mark, high-class live syllables have a rising tone, while mid- and low-class live syllables have a mid tone. Unmarked dead syllables with mid- or high-class initials have a low tone. With a low-class initial, an unmarked dead syllable has a high tone if its vowel is short and a falling tone if its vowel is long.

3. Tone Marks And Consonant Class
There are four tone marks: Mai Ek (◌่), Mai Tho (◌้), Mai Tri (◌๊), and Mai Chattawa (◌๋). The marks appear above the consonants in the illustrated spellings. This overview does not give a complete rule for placing a mark with an upper vowel or in every written cluster. In the ordinary patterns taught here, mai ek gives a low tone with a mid- or high-class initial and a falling tone with a low-class initial. Mai tho gives a falling tone with a mid- or high-class initial and a high tone with a low-class initial. The ordinary mai tri and mai chattawa patterns use mid-class initials for high and rising tones. Do not treat a mark’s name as an instruction to use the same spoken tone with every consonant.

4. Leading Consonants
Some spellings use a leading consonant to determine the tone rules for a following sonorant. For example, silent high-class ห makes หน้า and หนา follow high-class tone rules: หน้า is falling and หนา is rising. The silent leading อ pattern is limited to the four bases beginning with อ before ย; it is not a general way to alter every low-class consonant. Compare the complete entries for Leading Consonants and The Silent อ. For the complete spelling system, including these leading-consonant patterns, see How Tone Is Decided.

Examples (5)

  1. นา

    Rice field (Mid tone)

    Word by Word: field

    นา has a mid tone in its Standard Thai reading. Mid is a relative tone category, not a requirement to keep the pitch perfectly flat.

  2. หน้า

    Face / Front (Falling tone)

    Word by Word: face

    หน้า has a falling tone. Its pitch moves down from a higher part of the range in a clear citation reading; the exact starting point and speed can vary.

  3. หนา

    Thick (Rising tone)

    Word by Word: thick

    หนา has a rising tone. In a clear citation reading, it rises from a low part of the range; the exact shape is not identical for every speaker or context.

  4. คา ข่า ข้า ค้า ขา

    Stuck, Galangal, I/Servant, Trade, Leg

    Word by Word: stuck galangal I trade leg

    These five words share the consonant and long vowel represented here as khaa. Their tones, in order, are mid, low, falling, high, and rising.

  5. ใกล้ / ไกล

    Near (Falling) / Far (Mid)

    Word by Word: near / far

    ใกล้ (near) and ไกล (far) have the same consonants and vowel but different lexical tones: falling and mid respectively. Learn the tone distinction rather than treating them as the same word.

Common Mistakes

  • Assuming tone marks always indicate the same tone.

    ข่า = ค่า
    ข่า (เอก); ค่า (โท)

    In the ordinary mai ek patterns used in this task, a mid- or high-class initial gives a low tone, while a low-class initial gives a falling tone. Consonant class is therefore essential when reading this mark. For other spellings, use the full tone rules, including the syllable ending and vowel length where relevant.

  • Treating a word's lexical tone as interchangeable with question intonation.

    ไม่?
    ไหม?

    The falling-tone word mâi (not) and the question particle mǎi shown here are different words. The rising notation in this exercise represents the spelling-based reading of the question particle; it is not a rule that every Thai question has rising pitch. The particle also has a high-tone reading in spoken teaching examples. Keep the intended word distinct rather than turning the negative word into a question simply by changing its tone.