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These tools divide by what you are trying to find out. If you want to know how much to set aside regularly to reach a target, that is a savings goal question. If you want to know whether a balance will last, that is a drawdown question, and it behaves very differently, because the order in which returns arrive matters once you are withdrawing.
Account-specific calculators exist because contribution limits, tax treatment and withdrawal rules are not interchangeable. A Roth contribution, a traditional 401(k) contribution and a solo 401(k) contribution each have their own limits and their own tax consequences, and the limits are revised by year, so always check the year stated on the tool page.
Start with the savings goal calculator, then the 401(k) contribution calculator or the Roth IRA calculator for account-level limits, and the pension drawdown calculator once you are taking money out.
It depends on the target, the horizon and the return you assume. Because the return assumption drives the answer, run it at a conservative rate before committing.
The difference is when tax is paid, now or on withdrawal. Which is better depends on your current rate versus the rate you expect later, which is why this is a genuine judgement call.
Because withdrawals in a falling market remove more units than the same withdrawal in a rising one. The sequence of returns, not just the average, decides how long a balance lasts.
How this page is built and kept current. Written and fact-checked by the MoneyCalcsHub editorial team. We do not sell financial products and we accept no payment to change a result, the arithmetic on this page runs in your own browser from the numbers you type.
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