You can calculate your monthly mortgage payment, not including taxes and insurance, using the following equation:
M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
P = principal loan amount
i = monthly interest rate
n = number of months required to repay the loan
Once you calculate M (monthly mortgage payment), you can add in the monthly property tax and homeowners insurance premium, if you have them. These are fixed costs that aren’t determined by how much you borrow from the bank, so they can easily be added to the monthly cost.