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. Minimum IRA Distribution Use this calculator to determine the amount that the federal government requires you to withdraw annually from your IRA. Social Security Calculator Estimate your Social Security benefits using the Social Security Administration's Quick Calculator.