A million dollars is a lot of money to anyone, but we're long past the days when it could buy you a luxurious retirement. Most workers today will need a lot more to ensure a comfortable future, especially if they expect their retirement to last two or more decades.

Guessing isn't a great idea when your future financial security is on the line. Instead, let's talk about how to calculate what you'll actually need for retirement.

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Source Fool.com