If I loan 35 year, how much I need yo pay every month?

To calculate your monthly loan payment, you need the loan amount and interest rate. The formula is: M = P × [r(1+r)^n] / [(1+r)^n – 1], where M is monthly payment, P is loan principal, r is monthly interest rate (annual rate/12), and n is total months (loan years × 12). For a 35-year loan, n = 420. Without the loan amount and interest rate, I cannot give a specific figure. Consult your bank or use an online mortgage calculator with those details.