คะ vs ค่ะ: How to Use Thai Polite Endings

You have learned to add a polite ending to a Thai sentence. Then you notice two spellings that often appear as the same English word, “kha”: คะ (khá) and ค่ะ (khâ). Which one belongs after a question, and which one belongs after “thank you”?

The useful starting point is to learn their sound and their job together. These endings do not change the main information in your sentence, but they help shape how you speak to another person.

1. Hear the difference before memorising the spelling

Both endings have a short vowel. In our reading system, kh represents an aspirated k sound: say k with a small puff of air. It is not an English k followed by a separate h syllable.

Pronunciation (Thai Simple IPA). Thai Simple IPA here means an IPA-based learner transcription following the Thai Notes pronunciation guide, rather than strict IPA. An acute mark indicates high tone and a circumflex indicates falling tone. Predictable glottal stops are not written in this learner system. Every complete example below has three lines: Thai, pronunciation, and English. Long vowels are doubled; tone marks appear on the first vowel: low à, falling â, high á, rising ǎ; mid tone is unmarked. Hyphens separate syllables within longer words as a display aid; spaces separate words.

You may hear variation in the pitch of natural speech, including a low-tone variant (khà) of the usual falling-tone ending (khâ), recorded in dictionaries. For this first contrast, practise the high versus falling forms clearly, then listen for how a speaker uses them in context. Do not lengthen the vowel just because an English spelling repeats the letter a.

2. Match the ending to the complete sentence

For a straightforward polite question in this speaking style, start with คะ (khá). For a straightforward statement or a polite acknowledgement, start with ค่ะ (khâ). Learn the question or statement itself as a useful chunk instead of attaching an ending to isolated English words.

• ราคาเท่าไหร่คะ
  raa-khaa thâo-rài khá
  How much is it?
• ขอบคุณค่ะ
  khɔ̀ɔp-khun khâ
  Thank you.
• ค่ะ
  khâ
  A polite acknowledgement, such as “yes” or “okay”, when the context supports that meaning.

If you are using the masculine polite speaking style, you will commonly hear ครับ (khráp) in both questions and statements. You do not need to switch to feminine endings because you are speaking to a woman.

3. Notice the important softening expression

The question-versus-statement shortcut is a starting point, not a rule for every expression. In นะคะ (ná khá), the spelling is คะ (khá), even when the sentence is not a question. The preceding นะ (ná) helps soften the expression.

ขอบคุณนะคะ
khɔ̀ɔp-khun ná khá
Thank you, with a warmer or softer tone in a suitable context.

4. Practise a small exchange

Imagine a customer asking about a price. Both speakers in this example use feminine polite endings. Read each line for its meaning first, then pay attention to its final particle.

See the exchange: asking a price

Customer · asks
ราคาเท่าไหร่คะ
raa-khaa thâo-rài khá
How much is it?

Seller · replies
ห้าสิบบาทค่ะ
hâa sìp bàat khâ
Fifty baht.

For another short practice, say the question, pause, and imagine the reply before continuing. Then swap roles. If you need a number refresher, review Thai numbers 1–10. Keep the pace comfortable; an ending is easier to practise when the rest of the sentence is familiar.

Takeaway: begin with คะ (khá) for questions and ค่ะ (khâ) for statements and acknowledgements, then learn common combinations such as นะคะ (ná khá) as complete expressions. Your wording, voice and situation work together; one particle cannot make every sentence appropriate in every context.

For more everyday language to practise, explore five useful Thai phrases for beginners.

Pronunciation and usage references

The explanations and exercises above are original. Reference entries: คะ, ค่ะ, and นะ. Additional pronunciation checks: price-question word, thank-you expression, excuse-me expression, question particle, brief-wait expression, and a moment. Reading-system reference: Thai Notes pronunciation guide. Full-IPA cross-check: Wikipedia’s Thai IPA key.