Retirement Calculator

What is Retirement Calculator?

A retirement calculator projects how much money you will accumulate by retirement age based on your current savings, monthly contributions, expected investment returns, inflation rate, and timeline. Retirement planning is one of the most important financial decisions you will ever make, yet many people delay it because the math feels overwhelming. This calculator simplifies the process by modeling compound growth over decades, showing you exactly how your money grows year by year and whether you are on track to maintain your desired lifestyle after you stop working. It accounts for the eroding effect of inflation on purchasing power, so the projections reflect real-world spending ability rather than nominal dollar amounts. By adjusting variables like retirement age, contribution amount, and expected return rate, you can run multiple scenarios to find the savings strategy that best fits your goals and risk tolerance.

How to Use

1. Enter your current age and your target retirement age to establish the savings timeline -- the number of years your money has to grow through compound interest
2. Input your current total retirement savings across all accounts (401k, IRA, brokerage, etc.) as your starting balance
3. Set your monthly contribution amount -- this is the amount you plan to save and invest each month going forward
4. Enter the expected annual return rate (historically 7% for a diversified stock portfolio after inflation) and the expected inflation rate (typically 2-3%)
5. Review the projected retirement savings total, estimated monthly retirement income, and the year-by-year growth chart to see if you are on track
6. Experiment with different scenarios: try increasing contributions by $100/month, retiring 2 years later, or adjusting your return assumptions to see how each change impacts your outcome

Formula

Frequently Asked Questions

How much do I need to retire?

A widely used guideline is the 25x rule: multiply your expected annual expenses by 25. If you plan to spend $50,000 per year in retirement, you need approximately $1.25 million saved. This is derived from the 4% safe withdrawal rate, which historical data shows can sustain a diversified portfolio for 30+ years in most market conditions. However, your actual target depends on several personal factors: healthcare costs (which average $315,000 per couple in retirement), your desired lifestyle and travel plans, expected Social Security benefits, whether you will have pension income, the age you plan to retire, and your estimated life expectancy. Use this calculator to model your specific scenario rather than relying solely on rules of thumb.

What is the 4% rule?

The 4% rule, originating from the 1998 Trinity Study by professors at Trinity University, suggests that if you withdraw 4% of your retirement portfolio in the first year and adjust that dollar amount for inflation each subsequent year, your savings have approximately a 95% probability of lasting at least 30 years. For a $1 million portfolio, this means withdrawing $40,000 in year one, then $41,200 in year two if inflation is 3%, and so on. The rule assumes a balanced portfolio of roughly 50-75% stocks and 25-50% bonds. While not an absolute guarantee -- particularly in scenarios with poor early returns (sequence-of-returns risk) -- it has proven remarkably resilient through most historical market conditions, including the Great Depression and multiple recessions.

How to calculate retirement savings?

Retirement savings projections use the future value formula that accounts for compound interest growth on both your existing savings and your ongoing monthly contributions over time. The formula is FV = PV(1+r)^n + PMT[((1+r)^n - 1)/r], where PV is your current savings, PMT is your periodic contribution, r is the return rate per period, and n is the number of periods. This calculator handles the complex math for you -- just enter your current savings, monthly contribution amount, expected annual return rate (typically 6-8% for a diversified portfolio), and years until retirement. The most powerful insight from this formula is that time in the market dramatically outweighs the contribution amount: starting with $200/month at age 25 yields more than $500/month starting at age 40, purely due to compound growth.

What age should I start saving?

The ideal age to start saving for retirement is as soon as you earn your first paycheck, ideally in your early 20s. The math is compelling: investing $200/month starting at age 25 with a 7% average annual return accumulates approximately $525,000 by age 65. Waiting just 10 years and starting at age 35 with the exact same $200/month contribution yields only about $243,000 -- less than half the amount, despite contributing for only 10 fewer years. This dramatic difference is entirely due to compound interest, where your investment earnings themselves generate additional earnings year after year. Even if you can only afford $50 or $100 per month in your 20s, starting early and increasing contributions later is far more effective than waiting until you can save larger amounts.

How much should I save per month for retirement?

Financial advisors commonly recommend saving 15-20% of your gross income for retirement, including any employer 401(k) match. If you earn $60,000/year, that translates to $750-1,000 per month across all retirement accounts. If you started saving later than ideal (after age 35), you may need to save 25-30% to catch up. If you are in your 20s and that percentage feels unreachable, start with whatever you can -- even 5-10% -- and increase by 1-2% each year or whenever you get a raise. Use this calculator to input your specific age, savings, and income to find the exact monthly contribution needed to reach your target retirement balance by your desired retirement age.

What is the average retirement savings by age?

According to Federal Reserve data, the median retirement savings is approximately $35,000 for ages 35-44, $100,000 for ages 45-54, and $164,000 for ages 55-64. However, financial experts recommend having 1x your salary saved by 30, 3x by 40, 6x by 50, and 8x by 60 to maintain your lifestyle in retirement.

Should I use a 401k or IRA for retirement savings?

Both are excellent retirement vehicles. A 401(k) offers higher contribution limits ($23,000/year in 2024) and often includes employer matching -- always contribute enough to get the full match as it is essentially free money. An IRA offers more investment choices with a $7,000 annual limit. Many people use both: maximize the 401(k) match first, then fund an IRA, then contribute more to the 401(k).

How does inflation affect retirement planning?

Inflation erodes purchasing power over time. At 3% annual inflation, $1 million today has the spending power of only about $412,000 in 30 years. This calculator adjusts for inflation so your projected retirement income reflects real purchasing power, not just a nominal dollar amount that looks large but buys less.