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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

www.reference.com/article/calculate-population-growth-5b8ecfc4cf8308e9

Subtracting a past population value from the present population value, and dividing this result by the past population value, yields the population-growth rate. Multiplying the population-growth rate by 100 yields the growth percentage.

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To calculate percent sales growth over a period, subtract the previous sales figure from the current sales figure, divide the result by the previous sales figure, and then multiply this number by 100, explains Michael Marz for the Houston Chronicle. In order to obtain the most accurate growth percen

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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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Calculate population growth rate by dividing the change in population by the initial population, multiplying it by 100, and then dividing it by the number of years over which that change took place. The number is expressed as a percentage.