Calculate your monthly payment for fixed rate or adjustable rate loans. This calculator will compute a loan's monthly payment amount based on the principal amount borrowed, the length of the loan and the annual interest rate.Use our amortization calculator, type in a dollar figure under "Loan amount. Welcome to the official site of San Diego Funding and Great Pacific Funding. Use this calculator to estimate your monthly mortgage payment, including taxes and insurance. Looking to make a loan payment, request a loan payoff, correct a duplicate payment, or get answers to your general loan questions? You're in the right place. Calculate your monthly payment and see how the principal is paid over time. San Diego, CA 92186-5304. This form must be completely filled out and submitted along with all required documents.