Estimate retirement savings needed based on current age, income, savings rate, expected returns, and desired retirement lifestyle.
This tool starts from the retirement you describe and works backward: it turns the annual income you want into a required nest egg, then projects whether the money you save now, at the return you expect, reaches that figure by retirement age. Inputs are current age, income, savings rate, expected return, and desired retirement lifestyle. The number that surprises people most is the target itself: at the standard 4% withdrawal assumption, funding $60,000 a year means saving for a $1.5 million portfolio, before taxes.
A concrete input and expected output from the current implementation.
Input
Age 30, income $80,000, saving $1,000/month (15%), planning to retire at 65, expecting 6% real return, wanting $60,000/year in retirement income.
Expected output
Required nest egg at 65: $1,500,000 (4% withdrawal rate). Projected balance: about $1,425,000. Shortfall: about $75,000, roughly 5% of the target, so the plan funds about 95% of the desired income. Closing the gap takes about $1,053/month instead of $1,000, or a target lifestyle of about $57,000/year instead of $60,000.
At a 4% withdrawal rate, $60,000 a year implies a $1.5 million target ($60,000 / 0.04). Saving $1,000 monthly for 420 months at 0.5% per month grows to $1,000 x ((1.005^420 - 1) / 0.005), about $1,425,000, leaving the roughly 5% gap.
Desired retirement income is converted into a required portfolio using an assumed withdrawal rate, most commonly 4% of the starting balance each year, adjusted for inflation afterward. That makes the target 25 times desired annual income: $60,000 a year needs $1.5 million. The withdrawal rate is the most sensitive assumption - at 5% the target falls to 20 times income, at 3.5% it rises to nearly 29 times.
The calculator grows current savings from today's age to retirement, compounding monthly at the expected return, and compares the projected balance with the target. A shortfall is converted into the extra monthly amount needed - the payment that closes the gap. For a target stated in today's dollars, the expected return must be real, after inflation; a nominal return silently overstates the projection by the inflation rate.
At a 4% withdrawal rate the target is 25 times the income you want, and it must fund a retirement that can last 30 years and keep pace with inflation. $60,000 a year means $1.5 million before taxes. The figure shrinks once Social Security, a pension, or part-time work is counted, because less of the income has to come from savings.
Only as a long-range planning guess. The calculator applies one constant rate to every year, but real portfolios swing, and the order of good and bad years matters for how long money lasts. Run the tool at a lower return as well: if a one-point change in the assumption swings the answer a lot, plan toward the conservative side.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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