Loan Comparison Calculator View Calculator Compare up to 4 loans side by side with this calculator. Enter the loan amount, interest rate, and term of each loan and this calculator will show you the payment amount, the total interest you will pay, and the actual cost for each loan. You can also enter any additional principal amount you intend to pay each month and the calculator will show you each loan's anticipated payoff time. Learn more about putting this calculator or other calculators on your website.