Thank you in Thai is khop khun (ขอบคุณ, pronounced khɔ̀ɔp-khun), and the single word that follows it matters more than the phrase itself: a gender particle, khrap for men and kha for women, tacked onto the end. Get that one habit right and you’ll sound genuinely polite in almost any situation, from thanking a street vendor to a hotel receptionist. This guide goes deep on just this one phrase: the standard version, the “very much” upgrade, the casual and formal alternatives, the wai that often goes with it, and how to reply when someone thanks you.
It’s a spoke off outthailand.com’s basic Thai phrases hub, which also covers greetings, numbers and food phrases if you want the fuller traveller vocabulary. Romanisations below are pronunciation cues, not a strict transliteration system, spellings vary between phrasebooks and apps.
How do you say thank you in Thai?
Thank you is khop khun (ขอบคุณ), said roughly as khɔ̀ɔp-khun, with a falling tone on the first syllable. Said alone it’s understood everywhere, but Thai politeness works through a sentence-ending particle rather than a separate polite verb, so you’ll almost always hear it as khop khun khrap (men) or khop khun kha (women). That particle is doing real work: leaving it off doesn’t make you rude, but it does make the phrase sound noticeably flatter and less courteous. Attach it as a reflex, the same way you’d naturally soften a request in English, and khop khun will carry you through markets, taxis, restaurants and hotel checkouts.
Do you say khrap or kha after thank you?
It depends on your own gender, not the listener’s. Men end polite phrases with khrap (often heard closer to “krup”); women end them with kha. Neither word translates directly, they function like a spoken bow, signalling respect and closing the sentence politely. This is the single most useful rule in spoken Thai, and it applies to nearly every polite phrase, not just khop khun. Once it becomes automatic, “hello khrap/kha”, “sorry khrap/kha” and “thank you khrap/kha” all fall into place together.
How do you say thank you very much in Thai?
Thank you very much is khop khun maak (ขอบคุณมาก). Maak simply means “a lot” or “very”, so you’re saying, literally, “thank you a lot.” Keep your particle on the end as usual: khop khun maak khrap or khop khun maak kha. When gratitude runs even higher, Thai speakers sometimes double it up, khop khun maak maak, which reads similarly to “thank you so much” in English. It’s a natural upgrade for anything beyond a routine exchange, a genuine favour, a generous discount, help with directions when you were properly lost.
Is there a more casual way to say thanks?
Yes: khop jai (ขอบใจ). This is the relaxed register, used with close friends, siblings, children, or anyone clearly younger or more familiar than you, in the same way English speakers might say a quick “thanks” to a friend but “thank you so much” to a stranger who went out of their way. Using khop khun with a friend isn’t wrong, it just sits a touch more formal than the moment calls for. As a visitor you’ll reach for khop khun far more often, since most of your interactions are with people you don’t know well, but it helps to recognise khop jai if a Thai friend says it back to you.
Is there a more formal way to say thank you?
At the other end sits khop phra khun (ขอบพระคุณ), a highly formal, deeply respectful register reserved for monks, royalty, or people you owe genuine deference to. Most travellers will rarely, if ever, need it, khop khun khrap/kha comfortably covers hotel staff, restaurant servers, shop owners and everyone else you meet day to day. Reaching for khop phra khun in an ordinary interaction can actually land oddly, like replying to a barista with a formal, old-fashioned phrase in English. Save it for genuinely formal or reverent situations, and use the standard khop khun everywhere else.
Should you wai when you say thank you?
You don’t have to, but it’s the natural companion gesture. The wai, palms pressed together in front of the chest with a slight bow of the head, is Thailand’s traditional way to greet, apologise and give thanks. As a general pattern, the higher the hands are raised, the more respect is being conveyed, which is why a wai to a monk or an elder sits higher than one exchanged between friends. Tourists aren’t expected to master the finer points of who wais first or the exact hand height, saying khop khun with a smile and a small nod is always fine on its own, and adding a gentle wai when thanking someone directly, a shop owner who helped you find something, a stranger who gave directions, tends to be warmly received.
How do you reply when someone thanks you?
The standard reply is mai pen rai (ไม่เป็นไร), which covers “you’re welcome,” “no worries,” and “it’s nothing,” depending on context. It’s genuinely one of the most useful phrases in everyday Thai, since it’s also used to wave off small apologies or minor mishaps (“I’m so sorry” / “mai pen rai”). You can add your particle, mai pen rai khrap or mai pen rai kha, though the bare phrase alone is extremely common and perfectly natural on its own.
Pronunciation quick-reference table
| Thai | Romanised | Pronunciation | Use it for |
|---|---|---|---|
| ขอบคุณ (ครับ/ค่ะ) | khop khun (khrap/kha) | khɔ̀ɔp-khun | Standard, everyday thank you |
| ขอบคุณมาก | khop khun maak | khɔ̀ɔp-khun mâak | Thank you very much |
| ขอบใจ | khop jai | khɔ̀ɔp-jai | Casual, to friends, kids, juniors |
| ขอบพระคุณ | khop phra khun | khɔ̀ɔp phrá-khun | Formal, to monks, royalty, elders |
| ไม่เป็นไร | mai pen rai | mâi-pen-rai | Reply: you’re welcome / no worries |
Romanisations are pronunciation cues; spellings vary between phrasebooks and apps.
Common mistakes to avoid
The most frequent slip is dropping the khrap/kha particle altogether, khop khun on its own isn’t rude, but it does sound noticeably less polite than adding the particle, so make it a habit rather than an afterthought. The second is using the particle for the wrong gender out of nerves or habit, a quick mental check before you speak fixes this fast. The third is reaching for khop phra khun in ordinary situations, where its heavy formality can sound stiff or out of place, save it for monks, royalty, or genuinely reverent moments and let khop khun khrap/kha handle everything else. None of these will cause real offence, Thais are used to foreign accents and consistently appreciate the effort, but nailing the particle habit is the fastest way to sound naturally polite rather than merely understood.
Where to next
This is one phrase from a much bigger toolkit. Start with the full basic Thai phrases hub for greetings, food and shopping vocabulary, then go deeper on how to say hello in Thai and Thai numbers for markets and taxis. And to see what’s happening in the country while you practise your new phrase, browse the latest Thailand events.
Sources
- Standard Thai-language travel and phrasebook references for khop khun, khop khun maak, khop jai and khop phra khun.
- General linguistic references on Thai as a tonal language and on the khrap/kha politeness particle system.
- Cultural guides on the wai gesture and its use alongside expressions of thanks.