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The websites for the American Association of Retired Persons, or AARP and CNNMoney both offer retirement calculators that can help people determine what they need to save for retirement. The AARP's calculator, located under "Retirement Planning" in the "Work & Retirement" section, takes into conside

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Determine your lifestyle needs to find out how much money to save for retirement and when retirement is possible, recommends Mitch Strohm for Bankrate. Consider how much savings is needed, at what age you plan to retire and what proportion of income you plan to use each year of retirement.

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Bankrate.com has a calculator available that covers all the financial aspects of retirement. By using the provided chart to find your tax rate, it is possible to determine the amount due in taxes on your savings and income after retirement.

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A couple's retirement calculator is a program that asks important questions of each person in a couple to help determine how much money they need for retirement and how to start planning for it, according to New Retirement. The calculator should consider age, incoming benefits, current income and mo

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U.S. residents can utilize the retired income tax calculator at Apps.opm.gov/tax_calc/withhold_calc, according to the U.S. Office of Personnel Management's Retirement Information and Services. Many states also host calculators for retirees such as the Wisconsin Department of Employee Trust Funds at

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Retirees calculate their yearly required minimum distribution by dividing the amount in their retirement account as of December 31 of the previous year by their life expectancy according to an IRS table, reports the IRS. Account holders must recalculate the amount each year, according to Bankrate.

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A railroad retirement annuity is calculated through formulas for two tiers of benefits and the vested dual payment, according to the U.S. Railroad Retirement Board. Spousal and survivor annuities are calculated separately.

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The Social Security Administration, the U.S. Department of Labor and Bankrate offer specialized web-based calculators that can help prospective retirees estimate their future pensions, according to the respective websites of the three organizations. In addition, prospective retirees can determine ro

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Social Security retirement calculators can be found online at the official website of the Social Security Administration. A number of different calculators are available, including a retirement estimator, a retirement age calculator and a life expectancy calculator, notes the Social Security Adminis

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The Social Security Administration uses a person's highest-earning annual income over the course of 35 years, and then uses a formula by applying those figures to create the primary payment amount, explains AARP. The formula consists of a set of calculations that help average out the payments betwee