How to Use This Calculator
- Enter your Current Age and desired Retirement Age. The gap determines how many years your money has to grow.
- Enter your Current Savings — include 401(k), IRA, brokerage accounts, and other retirement-earmarked investments.
- Enter your planned Monthly Contribution. Even small increases (e.g., $100 more per month) can have a huge impact over decades.
- Set your Expected Annual Return. Historically, a diversified portfolio of stocks and bonds returns 6–10% before inflation.
- Set Expected Inflation. The long-term U.S. average is about 3%. Inflation erodes the purchasing power of your savings.
- Enter your Desired Monthly Income in retirement (in today’s dollars). This calculator adjusts it for inflation automatically.
Example: Age 30, Retiring at 65
Projected savings at 65: ~$1,270,000
Amount needed (inflation-adjusted): $4,000/month today → $10,569/month at age 65 → needs ~$3.17M
Gap: You’re about $1.9M short, meaning you would need to increase your monthly contribution to roughly $2,200/month to fully fund 25 years of retirement at today’s $4,000/month lifestyle.
Key insight: Inflation is the silent killer. $4,000/month in 35 years will feel like $1,500/month today if inflation averages 3%.
The 4% Rule Explained
The 4% Rule (also called the “Trinity Study” rule) is a widely used retirement planning guideline. It states that you can withdraw 4% of your portfolio in the first year of retirement, then adjust that amount for inflation each subsequent year, and your money should last at least 25–30 years.
Amount Needed = Annual Retirement Income × 25
If you need $48,000/year ($4,000/month): $48,000 × 25 = $1,200,000
If you need $72,000/year ($6,000/month): $72,000 × 25 = $1,800,000
If you need $120,000/year ($10,000/month): $120,000 × 25 = $3,000,000
The 4% rule isn’t perfect — it was based on historical U.S. market data and assumes a 50/50 stock-bond portfolio. Some financial advisors now recommend a more conservative 3.5% or even 3% withdrawal rate given current market conditions and longer life expectancies.
How Much Should I Save for Retirement?
Common benchmarks by age (as a multiple of your annual salary):
| Age | Savings Target | Example ($80K salary) |
|---|---|---|
| 30 | 1x salary | $80,000 |
| 35 | 2x salary | $160,000 |
| 40 | 3x salary | $240,000 |
| 45 | 4x salary | $320,000 |
| 50 | 6x salary | $480,000 |
| 55 | 7x salary | $560,000 |
| 60 | 8x salary | $640,000 |
| 65 | 10x salary | $800,000 |
These are general guidelines from Fidelity Investments. Your actual needs depend on your lifestyle, healthcare costs, Social Security benefits, and other income sources.
Tips for Retirement Planning
- Start as early as possible: Compounding is your greatest asset. A 25-year-old saving $300/month will have more at 65 than a 35-year-old saving $600/month (at the same return rate). See how the math works in our compound interest calculator.
- Maximize employer matching: If your employer matches 401(k) contributions, contribute at least enough to get the full match — it’s free money.
- Increase contributions with raises: Each time you get a raise, increase your retirement contribution by at least half the raise amount. Our salary converter can help you see how annual raises translate to monthly amounts.
- Diversify your investments: Spread across stocks, bonds, and other assets. Adjust your allocation as you approach retirement (more conservative).
- Account for healthcare: Fidelity estimates the average 65-year-old couple will need approximately $315,000 for healthcare costs in retirement.
- Have a backup plan: Consider part-time work, downsizing, or relocating to lower-cost areas as strategies if your savings fall short.
Retirement Accounts Compared
Choosing the right account type affects how much you keep after taxes:
| Account | 2025 Limit | Tax Benefit | Best For |
|---|---|---|---|
| 401(k) | $23,500 | Pre-tax contributions, tax-deferred growth | Employees with employer match |
| Traditional IRA | $7,000 | Tax-deductible contributions (income limits apply) | Self-employed, no employer plan |
| Roth IRA | $7,000 | Tax-free growth and withdrawals | Younger savers in low tax brackets |
| Roth 401(k) | $23,500 | After-tax contributions, tax-free withdrawals | High earners expecting higher future taxes |
| SEP IRA | $69,000 | Tax-deductible, high limit | Self-employed, small business owners |
| HSA | $4,300 (ind.) / $8,550 (fam.) | Triple tax advantage | Anyone with HDHP, used as retirement supplement |
People aged 50+ can make catch-up contributions: an extra $7,500 for 401(k) and $1,000 for IRA accounts in 2025.
Saving $500/month from Age 25 vs. 35 vs. 45 (7% Return)
All retire at 65. Same $500/month and 7% annual return.
The FIRE Movement: Retire Before 65
Financial Independence, Retire Early (FIRE) is a growing movement where people save 50–70% of their income to retire in their 30s or 40s. The core principles are simple:
- Save aggressively — 50% or more of after-tax income
- Invest in low-cost index funds
- Accumulate 25–33x annual expenses (a 3–4% withdrawal rate)
- Reduce spending through frugality and intentional living
Early retirees face unique challenges: they need their money to last 40–60 years instead of 25–30, they must bridge the gap before age 59½ when retirement accounts become accessible penalty-free, and they must plan for healthcare before Medicare at 65. Tracking your entire financial picture with a net worth calculator is a useful starting point.
How Inflation Erodes Retirement Savings
Inflation is the biggest hidden risk to retirement plans. At just 3% annual inflation, prices double every 24 years. If you retire at 65 and live to 90, the cost of living will roughly double during your retirement:
- $4,000/month today becomes roughly $8,400/month 25 years from now
- $50,000 in annual expenses becomes ~$105,000
- A $1 million portfolio that seemed sufficient at retirement may run out well before your late 80s if withdrawals are not inflation-adjusted
Use our inflation calculator to see exactly how inflation will affect your purchasing power over your planned retirement timeframe.
Frequently Asked Questions
How to Use This Retirement Calculator
Enter your current age, retirement age, savings, monthly contributions, and expected return rate. The calculator projects retirement savings and estimates if you are on track.
Formula & How It Works
Future Value = Current Savings Γ (1+r)^n + Monthly Contribution Γ [(1+r)^n β 1]/r. Required savings using the 4% rule: Annual Expenses Γ 25.
Calculation Example
Age 35, retire at 65, current $50K, save $1,000/mo at 7%: Projected savings = $1,219,000. The 4% rule supports $48,760/year in retirement.
Expert Tips
Start early β 10 years of delay requires nearly double the monthly savings. Max out employer 401(k) match first. Diversify across stocks, bonds, and real estate. Increase savings by 1% each year with raises.
How much do I need to retire comfortably?
A common rule of thumb is to aim for 70–80% of your pre-retirement income. Using the 4% rule, you’d need 25 times your desired annual retirement income. For example, if you want $60,000/year, you need $1.5 million saved. However, this varies based on your lifestyle, location, health, and other income sources like Social Security.
What age can I retire?
You can access 401(k) funds penalty-free at 59½. Social Security benefits can start at 62 (reduced) or full retirement age (66–67 depending on birth year). Medicare begins at 65. Many people aim for early retirement at 55 or even earlier through aggressive saving and the “FIRE” movement (Financial Independence, Retire Early).
What is a safe withdrawal rate?
The classic guidance is 4% per year (the Trinity Study). Some modern advisors suggest 3–3.5% for greater safety, especially for early retirees who need their money to last 40+ years. The withdrawal rate should be flexible — spend less in down markets and more in strong ones.
Does this calculator include Social Security?
No. This calculator shows retirement savings projections only. Social Security benefits are additional income on top of your savings. You can check your estimated Social Security benefit at ssa.gov and subtract that from your desired monthly income to find the gap your savings need to cover.
What if I’m behind on retirement savings?
It’s never too late to start. Increase your savings rate — even small increases compound over time. Take advantage of catch-up contributions (people 50+ can contribute an extra $7,500/year to a 401(k) as of 2025). Consider delaying retirement by a few years — each year you delay both adds savings and reduces the number of years you need to fund.