The retirement number most people quote is $1 million. The real answer is: it depends on your lifestyle — and the math is more accessible than you think.
The question "how much do I need to retire?" is the most important financial planning question most people never properly answer. Most guess. Some use round numbers. Almost nobody does the actual calculation. Here's how to get a real answer.
The 4% rule, derived from the Trinity Study (and extensively validated since), states that you can withdraw 4% of your portfolio in year one of retirement, then adjust for inflation each subsequent year, with a high probability of your money lasting 30+ years.
Your retirement number = Annual expenses ÷ 0.04
Or equivalently: Annual expenses × 25
| Monthly Expenses in Retirement | Annual | Portfolio Needed (4% rule) |
|---|---|---|
| $2,500/mo | $30,000 | $750,000 |
| $3,500/mo | $42,000 | $1,050,000 |
| $5,000/mo | $60,000 | $1,500,000 |
| $7,500/mo | $90,000 | $2,250,000 |
| $10,000/mo | $120,000 | $3,000,000 |
💡 Key insight: The number isn't about income — it's about expenses. Retiring on $3,500/month requires $1.05 million regardless of whether you earned $60,000 or $200,000 per year during your career.
Social Security reduces how much your portfolio needs to cover. If you expect $1,800/month from Social Security and need $4,000/month total, your portfolio only needs to fund $2,200/month:
$2,200 × 12 × 25 = $660,000 portfolio needed — not $1.2 million.
Check your estimated Social Security benefit at ssa.gov. For most people, it covers 25–40% of retirement income needs.
A common benchmark for retirement savings by age (assuming you want to maintain your current lifestyle):
| Age | Savings Target | Example (on $80k salary) |
|---|---|---|
| 30 | 1× salary | $80,000 |
| 35 | 2× salary | $160,000 |
| 40 | 3× salary | $240,000 |
| 50 | 6× salary | $480,000 |
| 60 | 8× salary | $640,000 |
| 67 | 10× salary | $800,000 |
Behind the benchmarks? You're not alone — most Americans are. The good news: compound interest means catching up in your 40s and 50s is still very viable if you increase contribution rates aggressively.
Let's model three realistic scenarios, all targeting $1.2 million by age 65 at 7% return:
| Scenario | Age Start | Current Savings | Monthly Needed |
|---|---|---|---|
| Early starter | 25 | $0 | $415/mo |
| Mid-career | 40 | $50,000 | $1,540/mo |
| Late starter | 50 | $100,000 | $3,820/mo |
The late starter needs to contribute 9× more per month than the early starter to reach the same destination — purely because of the shorter compounding runway.
The 4% rule has caveats worth understanding:
Project your exact retirement balance, monthly income, and whether you're on track with our retirement calculator. Use our savings goal calculator to set monthly contribution targets, and our inflation calculator to see what your expenses will look like in 20–30 years.
🏠 Use the Retirement CalculatorYour retirement number isn't $1 million or $2 million — it's your expected annual expenses multiplied by 25. Calculate that number, factor in Social Security, then work backward using a retirement calculator to find the monthly contribution that gets you there. The earlier you run this math, the more time compound interest has to do the work for you.