The retirement calculator does these computations by taking into account the retirement savings you already have accumulated:

* savings in a retirement plan such as 401k or IRA
* monthly income you will receive from a pension or from social security or retirement deferred comp plan
* non-retirement assets that you own: equities, bonds, mutual funds, notes, etc.
* accumulated equity in your dwelling you might have available if perhaps you plan to buy a smaller property and free up equity for investment or take a reverse mortgage

The retirement calculator also accounts for the age at which you want to retire and your forecasted life expectancy. While you may be thinking like the largest issue is the savings you bring into your retirement that will affect your retirement comfort, it is really not these financial facets. The biggest variables of your retirement success are your retirement age and the number of years you spend in retirement. Therefore, when applying a retirement calculator, we suggest you run the scenario a number of times using different life expectancy estimates and also see what happens when you vary your retirement inception from say age 64 to age sixty six. You may be surprised at the difference you see.

The most superior retirement calculators are typically NOT those encountered on-line. The most useful calculators are software that you pay for (not very expensive) as they provide for much more refined output. For example, while the free online retirement calculator will offer you an approximation of the amount you require to save up or the nest egg you need to meet your retirement income goals, the bought retirement calculators often engage Monte Carlo simulations to account for many future outcomes. Different from the free online retirement calculator that provides ONE average outcome, Monte Carlo models produce an array of possible outcomes with their likelihood. You can hence see the probability of a specific retirement plan futures occurring.

Be aware that any retirement calculator has failings since it must rely on assumptions for example:

1. Expected yearly returns for the asset types you choose (e.g. stocks, bonds, etc.). Some retirement calculators ask you for these estimations while others have built in assumptions. Either way, if the forecast is that stocks produce a 10 percent return over the next thirty years and they generate an 8% return, your retirement years may not go as projected.
2. Expected suppositions about asset class movements and correlations with other classes may not go as assumed. For example, even though stocks are believed to generate ten percent yearly returns over your retirement years and so they do, if the stocks lose eight percent for each of the starting three years of your retirement, your retirement financial objectives will still not be attained because the order of returns has an important impact on your retirement calculations.
3. No one knows what income tax rates we will have. When you make your assumptions, it is best to bet that rates will be higher later on (how else can the US government close the deficit)?
4. No one knows what the inflation rate we will have. Tightly associated to this is the value of the US dollar and most retirement calculators do not take that into account. If you want to travel abroad in retirement and the US dollar is worth twenty percent less, then it means your travel costs abroad will cost you 25% more. The value of the $US plus the affect of domestic inflation are two other uncertainties that a retirement calculator may not account for or may need to rely on estimations that prove incorrect.

But before you come to the decision that employing a retirement calculator is a poor use of time, we encourage you to reconsider.

By doing the exercise and taking into consideration the elements and seeing how the individual retirement variables interact, any retirement calculator provides you with a lot better sense of realism for your retirement objectives