How do you say hello how are in Hindi?

There are a few ways to say "hello, how are you" in Hindi, depending on the formality and context:

Formal:

* नमस्ते, आप कैसे हैं? (Namaste, aap kaise hain?) - This is the most polite and respectful way to greet someone.

* शुभ प्रभात, आप कैसे हैं? (Shubh prabhat, aap kaise hain?) - This is a formal greeting used in the morning.

* शुभ संध्या, आप कैसे हैं? (Shubh sandhya, aap kaise hain?) - This is a formal greeting used in the evening.

Informal:

* नमस्ते, कैसे हो? (Namaste, kaise ho?) - This is a more casual way to greet someone.

* हाय, कैसे हो? (Hi, kaise ho?) - This is a very informal greeting.

* क्या हाल है? (Kya haal hai?) - This literally means "How is the situation?" and is used as a casual greeting.

Note:

* "Namaste" is a common greeting in Hindi, meaning "I bow to you". It is considered respectful and polite.

* "Aap" is the formal form of "you" in Hindi. "Tu" is the informal form.

It's always best to use the formal greetings unless you know the person well.