The monthly repayment amount is equal to (loan principal times monthly loan interest rate times (1 monthly loan interest rate) times the power of repayment months) divided by ((1 monthly loan interest rate) times the power of repayment months minus 1). The loan principal refers to the total amount of the loan application. The monthly loan interest rate is the annual loan interest rate divided by 12, and the number of repayment months is generally the loan term multiplied by 12 months. The calculation method of credit loan calculator formula is relatively simple, and the purpose of calculation can be achieved by using Excel or calculator.