Retirement Calculator
Calculate your projected retirement balance, safe monthly withdrawal, and whether your current savings rate creates a surplus or shortfall against your expected expenses.
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Enter your values above to see the results.
Tips & Notes
- ✓Use a 30-year retirement horizon as the minimum planning period — a person retiring at 65 has a meaningful probability of living to 95, and portfolio depletion at 85 is a crisis.
- ✓The 4% annual withdrawal rule provides a sustainable income floor for 30 years based on historical market returns — withdrawing more than 4% increases the risk of premature depletion.
- ✓Social Security optimization is one of the highest-leverage retirement decisions — delaying from 62 to 70 increases the monthly benefit by approximately 77%, permanently and inflation-adjusted.
- ✓Working two extra years has a triple compounding effect: two more years of contributions, two more years of portfolio growth, and two fewer years of withdrawals.
- ✓Inflation-adjust your expense estimate for the full retirement period — $5,000/month today costs $9,031/month in 20 years at 3% inflation, and healthcare inflation runs even higher.
- ✓Capture the full employer 401k match before any other savings allocation — it is a guaranteed 50-100% return on every matched dollar, superior to any other investment available.
Common Mistakes
- ✗Underestimating retirement lifespan — planning for 20 years of retirement when actual longevity may extend to 30+ years is one of the most common and most costly planning errors.
- ✗Not inflation-adjusting retirement expense estimates — a flat $5,000/month need grows to $10,469 in 25 years at 3% inflation, which fundamentally changes the required savings target.
- ✗Ignoring healthcare costs in retirement — average healthcare spending in retirement exceeds $6,000/year per person and grows faster than general inflation.
- ✗Relying on a single return assumption without stress-testing lower scenarios — a plan that works at 7% but fails at 5% is fragile; test at multiple return assumptions.
- ✗Counting on Social Security as the primary retirement income source — benefits may be reduced if trust fund reserves are depleted without Congressional action.
- ✗Not updating the retirement plan after major life events — a job change, salary increase, market downturn, or change in expenses should trigger a full plan recalculation.
Retirement Calculator Overview
A retirement calculator projects the most important number in personal finance: will your money last as long as you do? It combines your current savings, monthly contributions, expected investment return, and retirement expenses into a single honest answer — surplus or shortfall — with the years your savings will sustain you.
Most people dramatically underestimate how much they need. This calculator shows the real number before it is too late to change the outcome.
What each field means:
- Current Age — your age today; determines how many years of compounding remain before retirement
- Retirement Age — when you plan to stop working; every extra year of saving adds contributions and compounding
- Current Savings — your existing retirement balance; benefits from the full remaining accumulation period
- Monthly Contribution — what you add each month; the most controllable variable in retirement planning
- Expected Return — annual portfolio return during accumulation; use 6-7% for a diversified portfolio
- Inflation Rate — annual price increase; your expenses grow with inflation even after retirement
- Monthly Expenses in Retirement — your estimated spending need in today dollars
- Expected Social Security — monthly benefit you expect to receive; reduces the portfolio withdrawal needed
What your results mean:
- Savings at Retirement — your projected portfolio balance on your retirement date
- Safe Monthly Withdrawal — the amount your portfolio can sustain using the 4% rule
- Years Savings Last — how long your portfolio survives at your planned spending level
- Monthly Surplus or Shortfall — the gap between what you can withdraw and what you need to spend
Example — Age 40, retire at 65, $80,000 saved, $1,200/month contribution, 7% return, 3% inflation, $5,000/month expenses, $2,000 Social Security:
Years to retirement: 25 Savings at retirement: $1,247,000 Safe monthly withdrawal (4% rule): $4,157 Social Security: $2,000/month Total income: $6,157/month Monthly expenses at retirement (inflation-adjusted): $10,469 Monthly shortfall: $4,312 Portfolio lasts approximately 18 years — retires at 65, runs out at 83. Fix: increase monthly contribution to $2,100 to close the gap.
EX: How contribution rate changes the retirement outcome (same scenario) $800/month: balance $831,000, lasts 13 years — runs out at 78 $1,200/month: balance $1,247,000, lasts 18 years — runs out at 83 $1,800/month: balance $1,745,000, lasts 28 years — runs out at 93 $2,200/month: balance $2,103,000, surplus — never runs out Each extra $400/month adds approximately 5 years of retirement security.
Savings needed at retirement by monthly expense and Social Security:
| Monthly Expenses | SS $1,500 | SS $2,000 | SS $2,500 |
|---|---|---|---|
| $4,000/month | $750,000 | $600,000 | $450,000 |
| $6,000/month | $1,350,000 | $1,200,000 | $1,050,000 |
| $8,000/month | $1,950,000 | $1,800,000 | $1,650,000 |
Impact of retirement age on final balance — $80,000 saved, $1,200/month, 7% return:
| Retirement Age | Balance at Retirement | Extra vs Age 65 |
|---|---|---|
| 60 | $873,000 | -$374,000 |
| 65 | $1,247,000 | baseline |
| 67 | $1,466,000 | +$219,000 |
| 70 | $1,853,000 | +$606,000 |
Working two extra years has a triple effect on retirement security: two more years of contributions, two more years of compounding on the existing balance, and two fewer years the portfolio must sustain withdrawals. The combination of these three effects makes delaying retirement from 65 to 67 worth approximately $219,000 in final balance plus two fewer years of drawdown — a total improvement in retirement runway of roughly 6-8 years.
Frequently Asked Questions
The standard formula: multiply your desired annual retirement income (minus Social Security and any pension) by 25. This produces the portfolio size that supports a 4% annual withdrawal indefinitely based on historical market returns. If you need $60,000/year from your portfolio: $60,000 x 25 = $1,500,000. If Social Security covers $24,000/year and you need $84,000 total: portfolio must cover $60,000 annually, requiring $1,500,000. This is a starting estimate — adjust for your specific retirement age, expected returns, healthcare costs, and whether you want to leave assets to heirs.
The 4% rule, from the Trinity Study, suggests withdrawing 4% of the initial retirement portfolio annually (adjusted for inflation each year) provides high historical probability of portfolio survival over 30 years. For a $1,000,000 portfolio: $40,000/year or $3,333/month. More conservative estimates of 3.3-3.5% reflect lower expected future returns and longer retirements. The rate that is sustainable depends on asset allocation, time horizon, and flexibility to reduce spending during market downturns. A higher equity allocation has historically supported higher withdrawal rates but with more short-term volatility.
Immediately — the mathematical advantage of starting earlier is larger than almost any other retirement planning decision. $10,000 invested at age 25 at 7% grows to $149,745 by age 65. The same $10,000 invested at age 35 grows to $76,123. The 10-year head start is worth $73,622 — nearly 7.4 times the original investment in difference alone. The specific amount matters less than starting immediately. Contributing $200/month starting at 25 produces a larger retirement balance than $400/month starting at 35, despite contributing half as much total.
Social Security replaces approximately 40% of pre-retirement income for average earners — less for high earners. It is inflation-adjusted, guaranteed for life, and continues for a surviving spouse. The claiming age decision is consequential: benefits are reduced 30% for claiming at 62 versus the full retirement age, and increased 24-32% for delaying from full retirement age to 70. The break-even age for delaying is typically 12-14 years after the later claiming age. For most people in good health with other income sources, delaying Social Security to 67-70 while drawing down portfolio assets early is the optimal strategy.
The commonly cited guideline is 15% of gross income including any employer match. At 25 with a 40-year horizon, even 10-12% may be sufficient with reasonable returns. At 35 with a 30-year horizon, 15-20% is typically necessary. At 45 with a 20-year horizon, 25-30% may be required to reach the same target. The exact percentage depends on your current savings, expected Social Security, retirement age, and lifestyle expectations. The most important behavior is starting immediately and increasing the contribution rate with every salary increase rather than allowing lifestyle inflation to consume raises.
Options exist but all involve trade-offs. Returning to part-time work reduces portfolio withdrawals and may provide healthcare coverage. Reducing retirement expenses through downsizing, relocating to a lower cost area, or eliminating discretionary spending extends portfolio life. Delaying Social Security claiming while working part-time locks in a higher permanent benefit. Selling a home and renting or downsizing releases equity for income. Reverse mortgages allow accessing home equity while remaining in the property. The earlier the shortfall is identified, the more options remain available — which is why running the retirement projection years before the planned date, not at it, produces actionable results.