Retirement Calculator — 4 Modes, 4% Rule, Savings Factors
Four retirement calculations on one page: am I on track, how much should I save, how long will my money last, and safe withdrawal rate. Models Social Security, employer 401(k) match, inflation, and the 4% rule. Free and ad-free.
Four Retirement Calculators on One Page
Most online retirement calculators answer just one question. We pack four onto one URL because they are the four questions every retirement planner actually asks:
- Am I on track? — given my current savings, contribution rate, and timeline, will I have enough? (Default mode.)
- How much should I save? — given my target nest egg and timeline, what monthly contribution gets me there?
- How long will my money last? — given my current savings and planned withdrawals, when does the money run out?
- Safe withdrawal rate — given my nest egg and a desired retirement length, how much can I safely withdraw each year?
All four modes share inputs (age, savings, return, inflation), so switching modes mid-planning preserves your numbers.
The 10/80/4 Rules — Every Retirement Planner Should Know These
Save at least 10% of your pre-tax income throughout your working career. Most modern planners revise this upward to 15%, including any employer 401(k) match. Saving 15% from age 25 through 65, invested in a balanced portfolio, has historically produced enough to cover an 80% income replacement at retirement.
You'll likely need approximately 80% of your pre-retirement annual income to maintain your standard of living in retirement. The 20% reduction reflects no payroll tax (FICA), no retirement saving, and lower commute costs. Frugal retirees may need only 70%; retirees with new healthcare or travel costs may need 100%+.
You can withdraw 4% of your initial nest egg in year 1, increase the dollar amount by inflation each year afterwards, and the money should last at least 30 years across most US historical market scenarios. The implied formula is: nest egg = annual spending × 25. Source: William Bengen 1994, Trinity Study 1998. Bengen has since suggested 4.5–5% may be safe; Morningstar 2023 suggests 3.3–3.7% given current valuations.
Fidelity's Savings Factor Benchmarks
Fidelity Investments publishes age-tier savings benchmarks based on multiples of your annual income. These have become the most widely cited retirement targets on the internet:
| Age | Target multiple | Example for $80k income |
|---|---|---|
| 30 | 1× annual income | $80,000 |
| 40 | 3× annual income | $240,000 |
| 50 | 6× annual income | $480,000 |
| 60 | 8× annual income | $640,000 |
| 67 (FRA) | 10× annual income | $800,000 |
Source: Fidelity Viewpoints, "How much do I need to retire?" — assumes 15% savings rate from age 25, retirement at 67, Social Security covering ~40% of income.
The Formulas
PV= current savings,PMT= monthly contributionr= annual return rate,n= number of months until retirement
Worked Example — David, Age 35, On Track at 65?
Common Sources of Retirement Funds
401(k), 403(b), 457 plans
Employer-sponsored defined-contribution plans. 2025 elective deferral limit: $23,500 ($31,000 with age-50 catch-up; $34,750 with the new ages-60-63 super-catch-up). Most employers match a portion (typically 3–6% of salary); always contribute enough to capture the full match — it's a 100% return.
Traditional IRA and Roth IRA
Individual retirement accounts. 2025 contribution limit: $7,000 ($8,000 age 50+). Traditional IRA contributions may be deductible (income limits apply if you have a workplace plan); Roth IRA contributions are after-tax but withdrawals in retirement are tax-free. Most planners suggest a mix.
Pension plans
Defined-benefit plans guaranteeing a monthly income in retirement based on years of service and final salary. Increasingly rare in the private sector but still common in government and union jobs. Pensions often replace 30–60% of final income; combine with Social Security and personal savings for a complete plan.
Annuities and other sources
Annuities convert a lump sum into guaranteed lifetime income — useful for longevity risk but expensive. Other sources include rental property income, business equity, taxable brokerage accounts, and home equity (via downsizing or reverse mortgage).
Withdrawal Strategies in Retirement
- 4% rule (constant inflation-adjusted): Withdraw 4% of initial nest egg in year 1, increase by CPI each year. Simple and historically safe over 30 years.
- Dynamic withdrawal (Guyton-Klinger guardrails): Adjust withdrawals up or down based on market performance — withdraw more in good years, less in bad years. Allows higher initial rates (4.5–5%) at the cost of variable income.
- Bucket strategy: Hold 1–2 years of cash, 3–5 years of bonds, the rest in stocks. Refill the cash bucket from bonds, refill bonds from stocks during bull markets. Reduces sequence-of-returns risk.
- Floor-and-upside: Cover essential expenses with guaranteed income (Social Security + annuity) and use a riskier portfolio for discretionary spending.
How to Use This Calculator
- Pick a mode. Default is "Am I on track?" — pick the question that matches what you want to know.
- Enter your basics: current age, target retirement age, current savings, current annual income.
- Enter your contributions and assumptions: monthly savings rate, expected annual return (7% historical average for a balanced portfolio), inflation (2.5–3% historical average).
- Optionally add Social Security from ssa.gov/myaccount — most users will see a meaningful reduction in required nest egg.
- Read the result panel and the savings-factor comparison. If you're below the Fidelity benchmark for your age, the calculator will flag it.
- Try preset scenarios ($500K @ 60, $1M @ 55, $1M @ 65, $2M @ 50) to see what each looks like.
- Share — the URL preserves all your inputs and mode.
Methodology & Assumptions
- Default annual return: 7% (historical average for a 60/40 stocks/bonds portfolio after inflation is ~5%; before inflation ~7%).
- Default inflation: 2.5% (post-1990 US average).
- Default safe withdrawal rate: 4% (Bengen 1994 / Trinity Study 1998).
- Default retirement length: 30 years (US life expectancy at 65 is roughly 19 years; planners use 30 as a safety buffer for longevity risk).
- Mode 1 (Am I on track?) projects monthly contributions at the return rate and compares to the nest egg needed for the target income at the SWR.
- Mode 2 (How much to save?) solves the future-value-of-annuity formula for the monthly payment.
- Mode 3 (How long will it last?) simulates year-by-year drawdown with returns and inflation-adjusted withdrawals until depletion.
- Mode 4 (Safe withdrawal rate) uses the 4% baseline adjusted for retirement length (longer = lower SWR) and portfolio assumption.
- Not modelled: taxes on withdrawals, RMDs, healthcare cost spikes, sequence-of-returns risk, Monte Carlo probability of success. These are coming in v2.
Glossary
- Nest egg
- The total accumulated savings you'll draw from in retirement. The 4% rule says nest egg = annual spending × 25.
- SWR (Safe Withdrawal Rate)
- The percentage of your initial nest egg you can withdraw each year (adjusted for inflation) without running out of money over your retirement horizon.
- Decumulation
- The phase of retirement where you spend down savings, the opposite of accumulation. Subject to sequence-of-returns risk.
- RMD (Required Minimum Distribution)
- Amounts the IRS forces you to withdraw from traditional retirement accounts starting at age 73 (or 75 for those born in 1960 or later, post-SECURE 2.0).
- Annuity
- A contract with an insurance company that exchanges a lump sum for guaranteed lifetime income. Used to hedge longevity risk.
- FRA (Full Retirement Age)
- The age at which you can claim full Social Security benefits — 67 for those born 1960 or later.
- Defined contribution plan
- A retirement plan where the contribution is fixed but the future benefit depends on investment performance (401(k), 403(b), IRA).
- Defined benefit plan
- A traditional pension where the benefit is calculated by formula (years of service × final salary × multiplier) and the employer bears the investment risk.
- Sequence-of-returns risk
- The risk that bad market returns early in retirement permanently damage a portfolio more than the same returns later — because withdrawals lock in losses.
- 4% rule
- Bengen 1994 / Trinity Study 1998 finding that a 4% inflation-adjusted withdrawal rate has historically lasted 30+ years across most US market scenarios.
- Savings factor
- Fidelity's term for current savings as a multiple of current annual income (e.g., 3× by 40, 10× by 67).
Frequently Asked Questions
A common rule is multiply your desired annual retirement spending by 25 (the inverse of the 4% rule). Targeting $60,000/year requires about $1.5 million. Fidelity recommends ~10× your final salary by age 67. Both numbers assume a 30-year retirement and Social Security covering ~40% of income.
From William Bengen's 1994 research and the Trinity Study: withdraw 4% of your initial nest egg in year 1, adjust upward for inflation each year afterwards, and the money should last at least 30 years across most historical scenarios. Formula: nest egg = annual spending × 25. Modern research suggests 3.3–4.5% depending on portfolio mix and starting valuations.
Fidelity recommends 3× your annual income by age 40. For someone earning $80,000, the target is $240,000. The full benchmark series: 1× by 30, 3× by 40, 6× by 50, 8× by 60, 10× by 67. These assume saving at least 15% of pre-tax income (including employer match) and retiring with Social Security.
Possible but tight. At 4% withdrawal, $500K supports $20,000/year ($1,667/month). Add expected Social Security (~$1,800–$2,000/month at FRA) for roughly $43,000/year total. Works for frugal lifestyles in low-cost areas; in expensive cities, requires part-time income or a geographic move.
Approximately 40% for the average earner, less for high earners and more for low earners. SSA designed it as a foundation, not a complete retirement plan. Get your personal estimate at ssa.gov/myaccount and plug it into the calculator's Social Security input.
You'll likely need approximately 80% of pre-retirement income to maintain your standard of living. The 20% drop reflects no FICA payroll tax, no retirement saving, and lower commute costs. Frugal retirees may need 70%; retirees with new healthcare/travel costs may need 100%+.
Save at least 10% of pre-tax income throughout your working career. Most modern planners revise upward to 15% (including employer match), especially for people starting after age 30. Consistent 15% from age 25 through 65, in a balanced portfolio, has historically met the 80% replacement target.
At 4% withdrawal, $1M produces $40,000/year ($3,333/month) and historically lasts at least 30 years. At $50K/year withdrawal: ~25 years. At $60K: ~20 years. At $80K: ~14 years. Mode 3 of the calculator simulates this drawdown year by year for your specific assumptions.
Recommended order: (1) 401(k) up to the full employer match (free money); (2) max out Roth IRA if eligible (tax-free growth); (3) return to 401(k) up to the annual limit ($23,500 in 2025, plus $7,500 catch-up at 50+). Pre-tax 401(k) also reduces current taxable income, which is valuable for high earners.
Inflation erodes the buying power of fixed dollar amounts. At 3% inflation, $50,000 of spending today equals about $90,300 in 20 years. A retirement plan that ignores inflation will badly understate the nest egg needed. The 4% rule handles inflation by increasing withdrawals by CPI each year — the calculator above uses inflation in all four modes.
The percentage of your initial nest egg you can withdraw each year without running out over your retirement horizon. Bengen 1994 + Trinity Study 1998 found 4% safe over 30 years across most US historical scenarios. Modern research (Morningstar 2023, Vanguard 2024) suggests 3.3–4.5% depending on portfolio mix and starting valuations. Mode 4 of this calculator computes SWR for your specific inputs.
Difficult but possible. A 35-year retirement is long, and Social Security can't be claimed until 62 (with reduced benefits). At a 3.3% withdrawal rate to compensate, $1M supports about $33,000/year. Covers a frugal lifestyle with paid-off housing and good health insurance, but leaves little margin. Most early retirees at this level move to lower-cost areas, take part-time work, or have a working spouse.
Social Security — The Foundation, Not the Plan
Social Security replaces approximately 40% of pre-retirement income for the average earner — by design, it is a foundation, not a complete retirement plan. The exact percentage depends on your earnings history; the SSA's progressive formula favours lower earners. High earners get a smaller percentage; low earners can get up to 75%.