How Much Do You Need to Retire?
I built this calculator to help you translate a retirement lifestyle into a concrete savings target. Retirement planning is genuinely difficult because it involves decades of uncertainty — unknown investment returns, unknown lifespan, unknown healthcare costs, and unknown inflation. This calculator helps you work through those variables and arrive at a ballpark figure you can use to set a savings goal today.
Enter your current savings, expected annual contributions, assumed investment return, target retirement age, and your estimated annual spending in retirement. The calculator projects whether you are on track to reach a savings balance that can support that spending level and shows how long the money would last at your projected withdrawal rate.
Key Concepts in Retirement Planning
- The 4% rule: A widely cited guideline suggesting that withdrawing 4% of your portfolio in year one of retirement, then adjusting for inflation each year, has historically supported a 30-year retirement without exhausting the portfolio. It is a starting point, not a guarantee.
- Retirement savings target: Multiply your expected annual retirement spending by 25 to get a rough savings target consistent with the 4% rule. For $60,000 of annual spending, the target is approximately $1.5 million.
- Social Security income: Social Security benefits reduce the amount your portfolio needs to generate. Include an estimate of your expected benefit to get a more accurate withdrawal requirement.
- Inflation in retirement: Spending needs tend to rise over a 20–30 year retirement. Build an inflation assumption into your projections rather than treating your withdrawal amount as fixed in nominal terms.
- Tax-advantaged accounts: 401(k), IRA, and Roth accounts each have different tax treatment on contributions and withdrawals. The tax status of your accounts affects the real value of your savings at retirement.
Common Retirement Planning Mistakes to Avoid
The most common mistake is starting too late. Compound growth rewards early contributions disproportionately — money invested in your 20s has decades more to compound than money invested in your 40s. Even small contributions early in a career make a significant difference by retirement.
Another common mistake is using an overly optimistic return assumption. Using a realistic, conservative rate — and stress-testing your plan against lower returns — produces a more robust savings target. Plans that only work under ideal conditions are fragile; plans that work under moderate conditions give you room to adapt.
Frequently Asked Questions
How does the 4% withdrawal rule work?
The 4% rule originated from research showing that a portfolio split roughly between stocks and bonds could sustain inflation-adjusted withdrawals of 4% of the initial balance for at least 30 years across most historical market scenarios. It is a useful starting point, but modern financial planners often recommend a more flexible withdrawal approach — spending less in bad market years and more in good ones — to increase the probability of the portfolio lasting through a longer retirement.
When should I start claiming Social Security?
You can claim Social Security benefits as early as age 62, but your monthly benefit is permanently reduced compared to waiting until your full retirement age (currently 67 for most people). Delaying past full retirement age increases your benefit by 8% per year until age 70. The right claiming age depends on your health, other income sources, and whether you are married. This calculator lets you include an estimated benefit so you can see how it reduces your required portfolio withdrawal.
What return rate should I use for retirement projections?
For long-term projections, a nominal return between 5% and 7% is commonly used for a diversified portfolio of equities and bonds. Using a rate toward the lower end of this range builds in a margin of safety. For real (inflation-adjusted) projections, subtract your expected average inflation rate from the nominal rate. The most important thing is consistency — use the same return assumption for the accumulation phase and the withdrawal phase, and stress-test the plan against returns that are 2–3 percentage points lower.
