How Much Do You Need to Retire?
The amount you need to retire depends on three factors: your desired annual spending, your expected investment returns during retirement, and how long you expect retirement to last. A widely used starting point is the 25x rule, which says you need 25 times your desired annual spending saved by retirement. If you want to spend $50,000 per year in retirement, you need $1.25 million. This rule is the inverse of the 4% withdrawal rate.
Tom Brewer retired from his engineering career at 63 with $680,000 in retirement savings. Using the 4% rule, that provides roughly $2,267 per month. Combined with Social Security, Tom lives comfortably in Pinewood Falls and volunteers as a math tutor at the local school.
The Retirement Savings Formula
This calculator uses two standard formulas to project your retirement savings:
Future value of current savings: FV = PV x (1 + r/12)^(12t)
Future value of monthly contributions (annuity): FV = PMT x [((1 + r/12)^(12t) - 1) / (r/12)]
- PV = present value (current savings)
- PMT = monthly contribution
- r = annual return rate (as a decimal, so 7% = 0.07)
- t = years until retirement
The total projected savings is the sum of both future values. The calculator then divides by (1 + inflation)^t to show the inflation-adjusted amount in today's purchasing power. For a deeper look at how compounding works, see the compound interest calculator.
Retirement Savings Benchmarks by Age
Financial advisors recommend saving a multiple of your annual salary at each stage of your career. The table below shows common benchmarks alongside average actual savings reported by Fidelity and Empower in 2026.
| Age | Recommended (x Salary) | Target at $75K Salary | Avg. 401(k) Balance |
|---|---|---|---|
| 25 | 0.5x | $37,500 | $14,200 |
| 30 | 1x | $75,000 | $37,000 |
| 35 | 2x | $150,000 | $76,500 |
| 40 | 3x | $225,000 | $127,100 |
| 45 | 4x | $300,000 | $184,800 |
| 50 | 6x | $450,000 | $248,000 |
| 55 | 7x | $525,000 | $313,200 |
| 60 | 8x | $600,000 | $378,400 |
| 65 | 10-12x | $750,000-$900,000 | $405,000 |
Sources: Salary multiples from Fidelity retirement guidelines. Average balances from Empower 2026 data. Actual balances include median earners and vary widely by income.
The gap between recommended and actual savings narrows over time because older workers tend to earn more and have had more years to benefit from employer matching. If you are behind the benchmarks, increasing your contribution rate by even 1-2% of salary each year makes a meaningful difference over a decade. Use our salary calculator to see how contribution increases translate to your paycheck.
The 4% Rule Explained
The 4% rule was introduced by financial planner William Bengen in a 1994 study. He analyzed every 30-year retirement period from 1926 to 1976 and found that a 4% initial withdrawal rate, adjusted for inflation each year, never depleted a balanced stock/bond portfolio in less than 30 years. Here is what the 4% rule looks like at different portfolio sizes:
| Portfolio Size | Annual Income (4%) | Monthly Income |
|---|---|---|
| $250,000 | $10,000 | $833 |
| $500,000 | $20,000 | $1,667 |
| $750,000 | $30,000 | $2,500 |
| $1,000,000 | $40,000 | $3,333 |
| $1,500,000 | $60,000 | $5,000 |
| $2,000,000 | $80,000 | $6,667 |
Source: Based on the Bengen 1994 withdrawal rate study. See SEC guide to savings and investing for background on withdrawal strategies.
Keep in mind that the 4% rule assumes a 30-year retirement and a balanced portfolio. If you retire early at 50, you may need a lower withdrawal rate of 3-3.5% to stretch savings over 40+ years. If you have other income sources like Social Security or a pension, you can withdraw less from savings and let the remainder continue growing.
Why Starting Early Matters
Compound interest accelerates dramatically over time. The first 10 years of investing build a foundation, but the last 10 years before retirement generate the most growth in absolute dollars. The table below compares three investors who each contribute $500 per month at a 7% annual return.
| Start Age | Years Investing | Total Contributed | Balance at 65 | Growth |
|---|---|---|---|---|
| 25 | 40 | $240,000 | $1,320,000 | $1,080,000 |
| 30 | 35 | $210,000 | $885,000 | $675,000 |
| 35 | 30 | $180,000 | $585,000 | $405,000 |
| 40 | 25 | $150,000 | $380,000 | $230,000 |
| 45 | 20 | $120,000 | $240,000 | $120,000 |
Source: Calculated using FV of annuity formula with PMT = $500/mo, r = 7%, monthly compounding. Rounded to nearest $5,000.
Maya Singh, a student in Pinewood Falls, opened a Roth IRA at 19 after Tom Brewer explained compound interest during a tutoring session. She contributes $200 per month from her part-time job. At 7% annual return, that $200/month will grow to roughly $640,000 by age 65, even though she will have contributed only $110,400 of her own money.
For a detailed look at how your contributions compound over time, try the compound interest calculator. To calculate the return on investments you have already made, use the investment return calculator.
2026 Retirement Account Limits
The IRS adjusts contribution limits annually for inflation. Here are the key limits for 2026 retirement accounts:
| Account Type | Under 50 | Age 50-59 / 64+ | Age 60-63 |
|---|---|---|---|
| 401(k) / 403(b) / 457(b) | $24,500 | $32,500 | $35,750 |
| Traditional / Roth IRA | $7,500 | $8,600 | $8,600 |
| SIMPLE IRA | $16,500 | $20,000 | $21,250 |
Source: IRS Notice 2025-67. The combined employee + employer 401(k) limit is $72,000 for 2026.
If your employer offers a 401(k) match, contribute at least enough to capture the full match before funding other accounts. A typical match of 50% on the first 6% of salary is an immediate 50% return on that money. After maxing the match, consider funding a Roth IRA for tax-free growth, then return to the 401(k) to increase contributions toward the annual limit.
To plan specific savings milestones with regular deposits, try our savings calculator. If you are also paying down a mortgage or car loan, the loan calculator can help you balance debt payments against retirement contributions.
This calculator provides estimates for informational purposes. It does not constitute financial advice. Actual investment returns vary based on market conditions and are not guaranteed. Consult a qualified financial advisor for decisions about your specific retirement plan.