Retirement Calculator
Nest egg ยท 4% rule ยท Income gap ยท Inflation adjusted
๐๏ธ Enter ages, savings, and income goal to see nest egg, income gap, and contribution needed.
How the Retirement Calculator Works
This retirement calculator projects your nest egg from today until retirement age, then estimates sustainable monthly income through life expectancy. It compares that income to your goal after subtracting other income such as Social Security or a pension.
Enter ages, current savings, monthly contributions, expected returns, inflation, and the spending you want in today dollars. Results update live so you can test retire earlier, save more, or change the withdrawal method without reloading the page.
Accumulation formula
Savings grow with monthly compounding. Each month the balance earns return divided by 12, then your contribution and employer match are added. Optional contribution raises increase the monthly deposit once per year.
Worked example
Age 35, retire at 65 (30 years), $75,000 saved, $1,000 per month total contributions, 7% return, no contribution raises:
Required nest egg
Desired portfolio income equals desired monthly income minus other income. Both figures are grown with inflation to retirement age so the target stays in real purchasing power.
The annuity method solves for the present value of monthly withdrawals lasting until life expectancy at your return rate during retirement. Use it when you want the portfolio to reach about zero at the planned end age instead of following a fixed percentage rule.
4% Rule, Income Targets & FAQ
The 4% rule is a planning shortcut, not a guarantee. It converts an annual spending need into a nest egg target. A more conservative 3.5% rate raises the nest egg you must accumulate for the same spending.
| Annual portfolio income | At 4% | At 3.5% | At 3% |
|---|---|---|---|
| $30,000 | $750,000 | $857,000 | $1,000,000 |
| $48,000 | $1,200,000 | $1,371,000 | $1,600,000 |
| $60,000 | $1,500,000 | $1,714,000 | $2,000,000 |
| $80,000 | $2,000,000 | $2,286,000 | $2,667,000 |
| $100,000 | $2,500,000 | $2,857,000 | $3,333,000 |
How to calculate retirement savings manually
1. Choose retirement age and years left. 2. Pick a nominal return and inflation rate. 3. Grow current savings with compound interest. 4. Add the future value of monthly deposits. 5. Inflate your spending goal and subtract other income. 6. Divide the annual portfolio gap by 0.04 for a 4% rule target. 7. Compare projected nest egg to that target.
Retirement Planning Guide
A retirement savings calculator answers three questions: how large the nest egg becomes, how much income it can pay, and how much you must contribute if there is a gap. Running those numbers early shows whether small monthly increases beat waiting for a higher salary later.
Practical example
Suppose you are 40 with $120,000 saved, contribute $900 per month plus $150 match, earn 7% before retirement and 5% after, plan to retire at 67, and want $4,500 per month in today dollars with $1,600 other income. Inflate the $2,900 portfolio gap to age 67, convert it with the 4% rule, then compare to the projected nest egg. If the gauge shows a shortfall, raise the monthly contribution until Needed Monthly Contrib is met or spend less in retirement.
Common mistakes
- Ignoring inflation so a large nominal balance looks safer than it is
- Counting on high double digit returns for decades
- Forgetting employer match or counting it twice
- Planning income without Social Security or pension offsets
- Using accumulation return rates for the withdrawal phase
- Setting life expectancy equal to or below retirement age
When this calculator is useful
Use it for annual checkups, deciding contribution increases, comparing retire at 62 vs 67, or estimating an early retirement / FIRE style timeline. Pair it with the 401k Calculator when you need employer match detail, or with the Investment Calculator for account level growth scenarios.
When this calculator may not be enough
It does not model taxes by bracket, Required Minimum Distributions, pension options, long term care costs, or sequence of returns risk. Those items can change spending capacity even when the average return assumption looks fine. Treat the verdict as a planning signal, then stress test with lower returns and higher inflation.
Limitations
Results are deterministic estimates. Real markets vary year to year. Fees, taxes, healthcare costs, and claiming strategies can change outcomes. This tool is for education and planning and does not constitute financial advice.
Sources & References
- Bengen, William P. Determining Withdrawal Rates Using Historical Data. Journal of Financial Planning, 1994.
- Cooley, Philip L.; Hubbard, Carl M.; Walz, Daniel T. Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable. AAII Journal (Trinity Study).
- Social Security benefit estimates: SSA.gov my Social Security
- Inflation context: U.S. Bureau of Labor Statistics CPI