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. Time To Payoff Credit Card Use this calculator to calculate the monthly payment and length of time it will take to pay off your credit card. Social Security Calculator Estimate your Social Security benefits using the Social Security Administration's Quick Calculator. Retirement Income Planner Use this calculator to evaluate your retirement income plan. Minimum IRA Distribution Use this calculator to determine the amount that the federal government requires you to withdraw annually from your IRA.