Retirement
Nest egg projection with inflation
The Retirement Calculator is a clean planning tool designed to project your retirement nest egg based on your current age, retirement age, starting savings, monthly contributions, expected investment returns, and inflation. By factoring in the eroding effect of inflation, it estimates the real purchasing power of your future savings, supporting your long-term planning.
Planning for retirement can feel overwhelming. Many people focus only on the total balance without considering how inflation will reduce the purchasing power of that money decades from now. This calculator addresses this issue by presenting both the raw future balance and the inflation-adjusted value, showing the true strength of your retirement savings.
All calculations run locally in your browser. No private financial details or income information are transmitted over the internet, protecting your privacy. It is a secure, responsive, and completely free planning tool designed to help you prepare for retirement.
What this retirement calculator computes
This calculator estimates the size of your retirement nest egg from your inputs. The primary result is the total projected balance at retirement, representing the combined sum of your contributions and investment growth.
The results display the total contributions you will make over the saving years and the portion of the balance generated by compound growth. The most important result is the inflation-adjusted value, which represents the purchasing power of your retirement savings in today's dollars, helping you evaluate if your savings rate is sufficient.
The mathematical model
The projection combines compound interest for the starting savings and the future value of a monthly investment annuity:
Nest Egg = [ Current Savings × (1 + r)^n ] + [ Monthly Contribution × ((1 + r)^n − 1) / r ]
Where r is the monthly rate of return (annual return divided by 12, then divided by 100), and n is the total number of months between your current age and retirement age. The inflation-adjusted value is calculated by discounting the final nest egg using the compound inflation rate over the saving years: Adjusted Value = Nest Egg ÷ (1 + (Inflation Rate ÷ 100))^Years.
Worked example of retirement planning
Let us look at a realistic example: a 30-year-old planning to retire at age 65, with $50,000 in starting retirement savings and a monthly contribution of $500. We will assume an expected annual investment return of 7% and an average inflation rate of 2.5%:
- Timeline: 35 saving years (420 months).
- Raw Projected Nest Egg: $1,372,217.11.
- Total Personal Contributions:
$50,000 + ($500 × 420) = $260,000.00. - Nest Egg Interest Growth:
$1,372,217.11 − $260,000.00 = $1,112,217.11. - Inflation-Adjusted Value (Today's Dollars): $578,141.22.
This example shows that while your raw balance exceeds $1.3 million, its actual purchasing power in 35 years is equivalent to $578,141 today. This illustrates the importance of adjusting your savings rate for inflation.
When to use this calculator
Use this retirement calculator to evaluate your long-term savings plan and determine if you are on track to meet your retirement goals. It is an excellent tool for testing different scenarios, such as increasing your monthly savings, retiring earlier or later, or adjusting your portfolio mix to target different investment returns.
By comparing the raw and inflation-adjusted balances, you can see if your retirement plan holds up over time. It is a valuable tool for anyone planning their career progression, budgeting, or tracking their path toward financial independence.
Important assumptions and market volatility
This calculator assumes a constant annual investment return and a steady rate of inflation every year. In reality, the financial markets are volatile, and returns vary from year to year. A market downturn early in your career has less impact than one right before retirement, a concept known as sequence of returns risk.
Additionally, the calculator assumes your contributions will remain fixed. In practice, as your income grows, you should increase your monthly retirement savings to match. The investment return and inflation estimates are for planning purposes only; actual results will depend on market performance and economic conditions.
Frequently asked questions
What return should I assume?
Common conservative assumption is 6%–7% nominal annual return for a diversified equity-heavy portfolio over 30+ years. Be more conservative if you are closer to retirement or invest mostly in bonds.
Why does this show two numbers?
Nominal future value and inflation-adjusted (real) future value. The latter is what your savings will be worth in today's purchasing power.
How much should I save?
A common starting target is 10–15% of gross income, including any employer match. Lower if you started early and have decades to compound; higher if you started later.
What is a realistic expected rate of return for investments?
Historically, the US stock market (S&P 500) has returned an average of 9% to 10% annually before inflation. For long-term planning, a conservative estimate of 6% to 8% is recommended, depending on your stock and bond allocation.
What is the 4% rule for retirement withdrawals?
The 4% rule is a guideline stating that you can safely withdraw 4% of your retirement nest egg in the first year of retirement, and adjust that amount for inflation each year after, with a high probability that your savings will last for at least 30 years.