Bi-Weekly Mortgage Comparison Calculator View Calculator Calculate and compare (formatted side by side) the payment amounts for up to 4 bi-weekly mortgage loans. Enter your sale price, any down payment you're making, the interest rate and the term of each loan. This calculator will then show you the bi-weekly principal and interest payment, the total amount of interest you will pay and the total amount of money you will spend over the life of each loan. You can also enter the points and other closing costs and roll those into your loans. You can even enter an additional amount you intend to add to each payment to work down your principal and the calculator will show you the anticipated payoff time. Learn more about putting this calculator or other calculators on your website.