The answer depends on you. Do you plan to travel the world? What is your cost of living? Where do you plan to live?

Use this tool to estimate how much you may need to save to retire in comfort.

We recommend estimating your retirement income needs at between 40 and 70% of your current income. Home ownership, dependents, pension, health care, and travel will all influence how much more or less you'll need. And consider your disposition -- if you're a spender, you'll probably need more income.