Best online retirement calculators
Most retirement questions boil down to one of 5 biggies. These tools give the best answers with the least hassle.
(Money Magazine) -- Some of the Web sites may require a free registration:
The answer: CNNMoney's Retirement Planner
Plug in your age, your income, when you plan to retire and other information. You'll get a quick estimate of how large a nest egg you'll need and what your odds are of reaching it.
The answer: Fidelity's myPlan Retirement Quick Check
Its asset-allocation feature can help you find the best mix of stocks and bonds for your retirement goals. Already retired? Use the Retirement Income Planner tool, which can reduce your chances of running out of money.
The answer: Morningstar's IRA Calculator
It can tell you whether you're eligible to contribute to a traditional IRA, a Roth IRA or both; help you decide which type to contribute to in a given year; and show you whether it makes sense to convert traditional IRA assets to a Roth.
The answer: T. Rowe Price's Retirement Income Calculator
Enter a few simple pieces of information and you'll get the odds that your portfolio will last throughout retirement. You can then see how tinkering with your withdrawals or investment mix might improve your chances.
The answer: The Immediate Annuity Calculator
Give your age, gender and the amount you want to convert into a guaranteed income stream. You'll get an estimate of how much an insurer will be willing to pay you (and/or your spouse) each month for the rest of your life.
More from Money's 100 best
4 ways to protect your money
4 paths to love and happiness
7 ways to bulletproof your job
10 careers to have in a recession
5 new features of a rich 401(k) 
