Personal Loan Calculator

This calculator relies on standard amortization mathematics to determine fixed monthly payments for installment loans. The mathematical formula used to compute your monthly payment (M) is: M = P * [r(1 + r)^n] / [(1 + r)^n - 1], where P represents the principal loan amount, r is the monthly interest rate (annual percentage rate divided by 12), and n denotes the total number of monthly payments in the loan term. To find the total interest paid over the life of the loan, the calculator multiplies your monthly payment by the total number of months and subtracts the original principal balance.

Imagine you want to take out a personal loan of $15,000 with an annual interest rate of 8.5% over a repayment term of 36 months (3 years). First, convert the annual interest rate to a monthly rate by dividing 0.085 by 12, which gives approximately 0.007083. Next, apply the amortization formula: raise (1 + 0.007083) to the 36th power, multiply by the monthly rate for the numerator, and divide by the result of that same term minus one for the denominator. Multiplying this by your $15,000 principal yields a fixed monthly payment of roughly $473.23. Over the 36-month term, you will pay a total of $17,036.28, meaning your total interest paid will be $2,036.28.

Before locking in a loan, always check for hidden fees such as loan origination charges or prepayment penalties, which can significantly alter the true cost of borrowing. Opting for a shorter loan term will increase your monthly payment but drastically reduce the total interest paid over the life of the loan. Conversely, choosing a longer term lowers monthly installments but raises your cumulative interest expenses. Finally, boosting your credit score prior to applying can help secure a lower interest rate, maximizing your savings.