How much is a mortgage on a 300k house?

Could you please provide me with an estimation of the mortgage payments on a property valued at 300,000 dollars? I'm interested in understanding the potential financial obligations involved in owning such a home, including the down payment, interest rates, and any other relevant factors that could affect the overall cost. Is there a specific calculator or formula you would recommend for making such a calculation, or do the figures vary widely depending on individual circumstances?