What Is The Monthly Payment On A $1,300,000 Mortgage?

If we're assuming good credit, income, debt ratios, etc then you're probably looking at around 7% or a little more (jumbos have higher rates than conventional).  Assuming 30 year mortgage that works out to $8,648.93, not including taxes and insurance, on a "normal" principal and interest loan.

Hope this helps.  Calculators to figure this and other examples are all over.  I use

http://easyrentaltools.com/tutorials/mortgage-calculator-1.cfm as it's quick and easy.

That depends on the term of the loan (i.e. How many years) and the interest rate.  Once you have those two pieces of information you can use an mortgage calculator like this - www.spain-lawyers.net

I would need some important details to figure that.

What is the interest rate on the mortgage?
Is it a fixed rate or ARM?
How long is the term?  15 years?  30 years?

Do you want just the principle and interest payment per month or do you have figures for Taxes and insurance too?  (PITI?)

Thanks!