🏖️ Retirement Calculator: Project Your Nest Egg
By Shihab Mia · Updated 2026-07-04
This retirement calculator provides estimates for educational purposes only and is not professional financial, tax or investment advice. Actual returns, inflation and taxes vary; consult a qualified financial adviser before making decisions.
Estimate only, not financial advice. Real returns and inflation vary year to year.
This retirement calculator projects how large your nest egg will grow by the day you stop working, based on your current age, current savings, monthly contributions and expected annual return. Enter your numbers and it instantly shows your projected balance at retirement, how much of that is your own money versus investment growth, and a first-year safe withdrawal estimate using the 4 percent rule. The short answer most people want: consistent monthly contributions compounded over decades usually matter more than the exact return rate you pick.
What is the Retirement Calculator?
A retirement calculator turns a few simple inputs into a long-range projection so you can see whether your current savings habit is on track. Under the hood it uses the future value of a series formula: your existing balance grows by compound interest, and each monthly contribution grows for the number of months left until you retire. Because the growth compounds every month, small changes to the contribution amount or the number of years can move the final nest egg by tens or hundreds of thousands of dollars.
The math this retirement calculator uses assumes contributions are added at the end of each month and that your expected annual return is converted to a monthly rate. If you contribute 500 dollars a month from age 30 to 65 at a 7 percent return, the retirement savings calculator projects roughly 1.06 million dollars, of which only about 230 thousand is money you actually deposited. That gap between what you put in and what you end with is the whole point of long-term investing, and it is why starting early beats trying to catch up later.
Once you have a projected nest egg, the next question is how much you can safely spend. This retirement planning calculator applies the well known 4 percent rule, a guideline popularized by the Trinity Study, which suggests withdrawing about 4 percent of your balance in the first year of retirement and adjusting for inflation after that. On a 1 million dollar nest egg that is 40 thousand dollars in year one, or roughly 3,333 dollars a month before taxes. It is a rough planning anchor, not a guarantee, and many advisers now treat it as a starting point rather than a hard rule.
Use this retirement calculator to run scenarios rather than to find one perfect number. Try lowering the return to 5 percent to stress test a weaker market, raise your monthly contribution by 100 dollars to see the compounding payoff, or push your retirement age out two years. The results are pre-tax and do not adjust for inflation, so treat the projected nest egg as a nominal target and remember that real purchasing power will be lower decades from now. For most people the biggest lever this retirement savings calculator reveals is simply saving a bit more, a bit earlier, for a bit longer.
When to use it
- Check whether your current monthly savings rate is on track to fund the retirement you want.
- Compare two contribution levels side by side to see the compounding payoff of saving an extra 100 or 200 dollars a month.
- Estimate a realistic first-year retirement income using the 4 percent safe withdrawal guideline.
- Stress test your plan by lowering the expected return to model a weaker stock market.
- See how delaying retirement by two or three years changes your projected nest egg.
- Motivate a younger saver by showing how much of the final balance comes from growth versus deposits.
How to use the Retirement Calculator
- Enter your current age and the age you plan to retire (retirement age must be higher).
- Type in your current retirement savings and how much you contribute each month.
- Set an expected annual return; 5 to 7 percent is a common long-term range for a diversified portfolio.
- Read the projected nest egg, total contributed, investment growth and the 4 percent safe withdrawal estimate.
- Adjust any input to run what-if scenarios, then use Copy result to save the numbers.
Formula & method
Worked examples
A 30 year old with 20,000 dollars saved contributes 500 dollars a month until age 65 at a 7 percent return.
- n = (65 - 30) x 12 = 420 months.
- i = 7 / 100 / 12 = 0.0058333 per month.
- Growth factor (1 + i)^420 is about 11.499.
- Nest egg = 20,000 x 11.499 + 500 x ((11.499 - 1) / 0.0058333), which is about 230,000 + 900,000.
Result: Projected nest egg is roughly 1,130,000 dollars, of which about 230,000 dollars is contributed and 900,000 dollars is growth. Year 1 safe withdrawal is about 45,000 dollars.
A 45 year old with 150,000 dollars saved contributes 800 dollars a month until age 67 at a 6 percent return.
- n = (67 - 45) x 12 = 264 months.
- i = 6 / 100 / 12 = 0.005 per month.
- Growth factor (1 + i)^264 is about 3.731.
- Nest egg = 150,000 x 3.731 + 800 x ((3.731 - 1) / 0.005).
Result: Projected nest egg is roughly 996,000 dollars. Total contributed is about 361,000 dollars, so growth is about 635,000 dollars. Year 1 safe withdrawal is roughly 40,000 dollars.
Projected nest egg for a 500 dollar monthly contribution over 35 years, by expected return (starting from 20,000 dollars)
| Annual return | Projected nest egg | Total contributed | Investment growth |
|---|---|---|---|
| 4% | $489,000 | $230,000 | $259,000 |
| 5% | $629,000 | $230,000 | $399,000 |
| 6% | $818,000 | $230,000 | $588,000 |
| 7% | $1,072,000 | $230,000 | $842,000 |
| 8% | $1,417,000 | $230,000 | $1,187,000 |
First-year safe withdrawal at 4 percent by nest egg size
| Nest egg | Per year (4%) | Per month |
|---|---|---|
| $500,000 | $20,000 | $1,667 |
| $750,000 | $30,000 | $2,500 |
| $1,000,000 | $40,000 | $3,333 |
| $1,500,000 | $60,000 | $5,000 |
| $2,000,000 | $80,000 | $6,667 |
Common mistakes to avoid
- Assuming an unrealistically high return. Plugging in 10 or 12 percent inflates the projected nest egg dramatically. A diversified long-term portfolio has historically averaged closer to 6 to 7 percent before inflation, so use a conservative rate for planning.
- Forgetting about inflation. This retirement calculator shows nominal dollars. A million dollars in 35 years will buy far less than a million today, so treat the result as a target to adjust for rising costs, not as future purchasing power.
- Treating the 4 percent rule as a guarantee. The 4 percent safe withdrawal figure is a historical guideline, not a promise. Poor market returns early in retirement, longer lifespans or higher spending can all require a lower withdrawal rate.
- Ignoring taxes and fees. The projection is pre-tax and ignores investment fees. Withdrawals from a traditional 401k or IRA are usually taxable, and even a 1 percent annual fee can meaningfully reduce your final balance over decades.
Glossary
- Nest egg
- The total amount of money you have accumulated for retirement, the balance this calculator projects for your retirement age.
- Compound interest
- Growth earned on both your original money and on previously earned returns, which is what makes long-term saving so powerful.
- Future value
- What a sum of money, plus ongoing contributions, is projected to be worth at a future date given an assumed rate of return.
- 4 percent rule
- A retirement guideline suggesting you withdraw about 4 percent of your nest egg in the first year, then adjust for inflation, to make savings last around 30 years.
- Annual return
- The percentage your investments are assumed to grow each year on average, converted to a monthly rate inside the calculation.
- Contribution
- The amount you add to your retirement savings each month, deposited on top of your existing balance.
Frequently asked questions
How much do I need to retire?
A common rule of thumb is to save about 25 times your expected annual retirement spending, which pairs with the 4 percent withdrawal rule. If you expect to spend 40,000 dollars a year from savings, that points to roughly a 1 million dollar nest egg. This calculator helps you see whether your current savings rate reaches that target.
What return rate should I use in a retirement calculator?
For long-term planning most people use 5 to 7 percent as a conservative pre-inflation estimate for a diversified stock and bond portfolio. Using a lower rate gives you a safer, more cautious projection, while very high rates like 10 percent can create a misleadingly large nest egg.
Does this calculator account for inflation?
No, the results are shown in nominal (today-unadjusted) dollars. That means the projected nest egg will have less purchasing power in the future than the same number does today. To plan in real terms, you can lower your expected return by roughly your assumed inflation rate.
What is the 4 percent rule?
The 4 percent rule is a retirement guideline that suggests withdrawing 4 percent of your nest egg in the first year of retirement, then increasing that dollar amount with inflation each year. It was designed to give a high chance of your money lasting about 30 years, though it is a starting guideline rather than a guarantee.
Are the contributions added at the start or end of the month?
This calculator assumes each monthly contribution is added at the end of the month, which is the standard ordinary annuity assumption. Contributing at the start of each month would grow slightly larger, but the difference over decades is small compared to the size of your contribution and return.
Does the projection include taxes and fees?
No, the projected nest egg is before taxes and does not subtract investment fees. Withdrawals from tax-deferred accounts like a traditional 401k or IRA are generally taxed as income, and ongoing fund fees reduce your net return, so your usable amount will be lower than the raw projection.
Sources
- Compound Interest Calculator and Saving and Investing Basics , U.S. Securities and Exchange Commission (Investor.gov) (2024)
- How Much Do I Need to Retire? Retirement Savings Guidelines , Fidelity Investments (2024)