401(k) Retirement Calculator — How Much Do You Need to Retire?

Retirement Savings — How to Figure Out Your Actual Number

The question “how much do I need to retire?” has no universal answer because retirement is not a universal experience. Someone who plans to travel the world needs a vastly different number than someone who plans to read books in a paid-off house. Someone retiring at 55 needs their money to last longer than someone retiring at 65. Someone with employer-provided health insurance has different needs than someone buying their own.

What you can calculate, with reasonable accuracy, is the specific number that funds your specific retirement plan. Here is how to work through that calculation honestly.

Step 1: Estimate Your Annual Retirement Expenses

The common rule of thumb says you need 70-80% of your pre-retirement income during retirement. This is a starting point, not an answer. Some expenses decrease in retirement — commuting costs, work clothing, retirement savings contributions, and payroll taxes. Other expenses increase — healthcare costs typically rise significantly, travel and hobbies may cost more if you have more free time, and home maintenance costs tend to increase as both you and your house age.

A more accurate approach: list your current monthly expenses, remove the ones that disappear after retirement, adjust the ones that change, and add new expected expenses. Include housing (mortgage or rent, property tax, insurance, maintenance), healthcare (insurance premiums, out-of-pocket costs, medications), food, transportation, utilities, entertainment, travel, and a buffer for unexpected expenses. For most people, this exercise produces a number between 60% and 100% of current income, depending on lifestyle plans.

Step 2: Account for Inflation

If you need $50,000 per year today, you will need considerably more in 20 or 30 years due to inflation. At a 3% average inflation rate, $50,000 in today’s dollars becomes $90,306 in 20 years and $121,363 in 30 years. This does not mean you need to save more — it means your investments need to grow faster than inflation, and your withdrawal plan needs to increase over time to maintain the same purchasing power.

Step 3: Determine How Long Your Money Needs to Last

If you retire at 65 and plan for a 30-year retirement (to age 95), your savings need to fund 30 years of expenses. Planning to age 95 when average life expectancy is lower may seem conservative, but running out of money at 87 is a catastrophe that no amount of earlier frugality can fix. It is better to leave money to heirs than to need financial support from children in your final years.

Step 4: Apply the 4% Rule (With Understanding)

The most cited retirement guideline is the 4% rule: in your first year of retirement, withdraw 4% of your total portfolio, then adjust that amount for inflation each subsequent year. Based on historical stock and bond market returns, this approach has a high probability of lasting 30 years without depleting your portfolio.

Under this rule, if you need $50,000 per year, you need $50,000 / 0.04 = $1,250,000 in retirement savings. If you need $80,000 per year, you need $2,000,000.

The 4% rule has limitations. It was derived from historical US market data during a period of strong returns. Future returns may be lower. It assumes a specific asset allocation (roughly 60% stocks, 40% bonds). And it does not account for variable spending — most retirees spend more in their active early retirement years and less in their later years.

Step 5: Calculate Your Required Monthly Savings

Once you have your target retirement number, work backward to determine how much you need to save each month. The formula involves compound growth: if you need $1,250,000 in 25 years and expect a 7% average annual return, you need to save approximately $1,650 per month. If you already have $200,000 saved, that existing amount will grow to approximately $1,085,000 in 25 years at 7%, meaning you only need to save enough to cover the remaining $165,000 — roughly $218 per month.

The earlier you start, the less you need to save monthly. Someone starting at age 25 with 40 years until retirement needs to save roughly $500/month to reach $1.25 million at 7% returns. Someone starting at 40 with 25 years needs approximately $1,650/month for the same goal. Someone starting at 50 with 15 years needs about $3,800/month. Compound growth is the most powerful retirement planning tool, and time is its only requirement.

Common Mistakes in Retirement Planning

Ignoring healthcare costs: Healthcare is often the largest and most unpredictable retirement expense. A 65-year-old couple can expect to spend $300,000 to $400,000 on healthcare during retirement, including insurance premiums, deductibles, co-pays, and services not covered by insurance.

Underestimating longevity: If one member of a couple reaches 65, there is roughly a 50% chance that at least one of them will live to 90. Planning for average life expectancy means a coin-flip chance of running out of money.

Not accounting for sequence-of-returns risk: A market crash in your first few years of retirement is far more damaging than one in your later years, because early losses reduce the base that generates future growth. This is why maintaining some conservative investments in retirement is important even though aggressive growth maximizes long-term returns.

Try different scenarios with our retirement planning tools to find the savings rate that puts you on track for the retirement you actually want — not a generic rule-of-thumb retirement, but yours.