Social Security Calculator Estimate your Social Security benefits using the Social Security Administration's Quick Calculator. Loan Amortization Calculator Use this calculator to calculate a loan amount based on your desired monthly payment or to calculate a monthly payment based on a loan amount. Mortgage Calculator Use this calculator to view the total interest and total payment for a mortgage based on the loan amount, years of payments, and annual interest rate you enter. Regular IRA vs. Roth IRA - Annual Contribution Use this calculator to determine whether a regular IRA or a Roth IRA is right for you. Paycheck Calculator - Salaried This calculator computes net or gross pay for a single paycheck and displays the various withholdings. Paycheck Calculator - Hourly This calculator computes gross and net pay for an hourly paycheck and displays the various withholdings.