Key takeaways
- Khrap (ครับ) and kha (ค่ะ) are particles added at the end of an utterance to show respect to the listener.
- The choice follows the speaker, not the listener: Wikipedia describes khrap as used by men and kha by women.
- Kha has two forms: falling-tone ค่ะ for statements and high-tone คะ for questions.
- Wiktionary notes both can stand alone as a polite 'yes' or acknowledgement.
- Wikipedia notes polite particles are not used in formal written Thai; casual particles such as na soften a sentence.
Two of the first words any Thai learner meets do not translate at all. Khrap and kha add politeness to the end of what you say to show respect to the listener. This guide covers who says which, the two forms of kha, where the particles go, and the casual particles that sit alongside them.
What polite particles are
Wikipedia describes Thai particles as often untranslatable words added to the end of a sentence to show respect, a request, encouragement or another mood, much as intonation does in English, and to vary formality. Its article on Thai honorifics adds that they are added to the end of an utterance or clause to show respect to the addressee, and that they are not used in written language or alongside the royal and formal registers.
Who says which
The choice follows the speaker, not the listener. Wikipedia gives khrap as the particle used when the speaker is a man and kha when the speaker is a woman.
| Particle | Tone | Speaker | Used for |
|---|---|---|---|
| ครับ khrap | high | men | statements, requests and questions |
| ค่ะ kha | falling | women | statements and requests |
| คะ kha | high | women | questions |
The table follows Wikipedia's summary of common polite particles in its Thai honorifics article.
The two forms of kha
Women's kha changes with the sentence. ค่ะ, with a falling tone, ends statements; คะ, with a high tone, ends questions. Wikipedia's Thai language article also puts requests with high-tone คะ, while its honorifics table and Wiktionary place requests with ค่ะ, so treat questions as the clear case. Khrap does not change.
Where they go
At the end. The greeting sawatdi (สวัสดี), Wikipedia's article on the wai notes, is usually followed by kha from a woman and khrap from a man: สวัสดีครับ and สวัสดีค่ะ. The particle closes the sentence, after everything else.
A polite yes
On their own, the particles do more work. Wiktionary describes ครับ as used by men to express affirmation or assent, and ค่ะ as used to express affirmation, agreement or acknowledgement. So a lone khrap or kha can mean "yes", "I see" or "understood". Wiktionary's example, from a Thai Bible translation, answers "Are you really my son?" with ใช่ครับ: "Yes, I am."
A worked example: buying something
A man asks a shopkeeper, a woman, for a price:
| Speaker | Thai | Meaning |
|---|---|---|
| Customer | สวัสดีครับ | Hello |
| Shopkeeper | สวัสดีค่ะ | Hello |
| Customer | เท่าไรครับ | How much? |
| Shopkeeper | ร้อยบาทค่ะ | One hundred baht |
If the customer were a woman, her question would end in high-tone คะ: เท่าไรคะ. Her other lines would take falling-tone ค่ะ. Thai numbers covers the prices.
Particles on everyday phrases
The same pattern makes any short phrase polite. ขอบคุณครับ or ขอบคุณค่ะ is "thank you", and ขอโทษครับ or ขอโทษค่ะ is "sorry" or "excuse me". Wiktionary adds a nuance worth knowing: plain ขอบคุณ and ขอโทษ suit people of equal or lower status, and more formal versions, such as ขอบพระคุณ, exist for thanking someone senior. The particle adds politeness; the word choice adds formality.
Where the particles come from
Wiktionary traces ครับ to ขอรับ, roughly "I am willing to receive (your command)", and ค่ะ to ข้า, "servant" or "I", in the phrase เจ้าข้า, "my lord". It notes that ค่ะ was formerly used by noblemen and is now often employed by women. Wikipedia's honorifics article dates polite particles as a type of honorific to the Bangkok period. The older forms survive at the formal end: ขอรับ for men and เจ้าขา for women, both listed for addressing a superior in formal or royal settings.
The friendlier particles
Wikipedia lists other common particles that change mood rather than politeness:
- นะ na: softens a sentence, makes a request or sounds friendlier.
- จ้ะ, จ้า, จ๋า cha: emphasis in less formal speech, with friends or someone younger.
- สิ si: emphasis or an instruction; Wikipedia notes it can come across as ordering someone to do something.
- ละ, ล่ะ la: emphasis.
Three particle slips
- Matching the listener's gender. The particle reflects the speaker.
- Using คะ for statements. High-tone คะ is for questions.
- Writing them in formal Thai. Wikipedia notes they are not used in elegant, written Thai.
Practising polite Thai
Regal - Learn Thai Language covers polite particles in its grammar lessons, alongside word order, questions and negation, and its speaking practice has you say phrases aloud. It is one of our language-learning apps. Thai greetings puts the particles to work, and Cantonese sentence-final particles shows a very different system.
Good to know
Frequently asked questions
What do khrap and kha mean in Thai?
Who says khrap and who says kha?
What is the difference between ค่ะ and คะ?
Do Thai people write khrap and kha in messages?
Sources
- Thai language (opens in a new tab)Wikipedia — accessed
- Thai honorifics (opens in a new tab)Wikipedia — accessed
- ครับ (opens in a new tab)Wiktionary — accessed
- ค่ะ (opens in a new tab)Wiktionary — accessed
- ขอบคุณ (opens in a new tab)Wiktionary — accessed
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