What is monthly payment on 330k mortgage?

That would depend on the interest rate and the length of the loan. Your payment for a 330,000 loan at 4.5% for 30 years would be $1672.06. If the mortgage was only for 15 years your payment would be $2524.48.

If you took the same loan amount for 30 years at 5% your payment would be $1771.51. So it is hard to say what your payment would be without the additional information, but this should give you an idea of how much your payment would be for that amount.