How the Retirement Calculator Works
This calculator uses the power of compound interest and future value mathematical formulas to project your nest egg. It takes your current age, desired retirement age, and current savings to determine the "time horizon" of your investment.
The core logic grows your current balance and monthly contributions annually by your expected rate of return until you reach your target retirement age.
Strategic Retirement Tips
- The 4% Rule: A common rule of thumb is that you can safely withdraw 4% of your total nest egg in the first year of retirement (and adjust for inflation thereafter) with a high probability of not running out of money for 30 years.
- Start Early: Because of compounding, $100 invested at age 25 is worth significantly more than $100 invested at age 35. Time is your greatest asset.
- Maximize Matches: If your employer offers a 401(k) match, contribute at least enough to get the full match. It is essentially a 100% immediate return on your investment.
- Diversify Tax Buckets: Use a mix of Traditional (tax-deferred) and Roth (tax-free) accounts to give yourself flexibility in retirement when tax rates may be different.
Example Scenarios
The "Early Starter"
A 25-year-old with $0 starting balance who invests $500/month until age 65. At a 7% average annual return, they would retire with approximately $1.2 Million.
The "Late Bloomer"
A 45-year-old with $50,000 starting balance who invests $1,500/month until age 65. Even with higher contributions, they would retire with roughly $1 Million—demonstrating the cost of waiting.
Frequently Asked Questions
A common goal is to aim for 10x to 12x your final annual salary. Alternatively, calculate your expected annual expenses and multiply by 25 (the inverse of the 4% rule).
While the S&P 500 has historically averaged around 10% before inflation, most experts recommend using a conservative estimate of 6-7% for long-term planning.
Yes, but be conservative. You can view your projected benefits on the SSA.gov website and add that as "other income" during your retirement phase.
Inflation reduces the purchasing power of your money. A million dollars today will buy much more than a million dollars in 30 years. Our calculator allows you to adjust for this to see "today's value."