How much money do you really need to retire?

It's one of the most searched financial questions in America — and one of the most poorly answered. Most responses give you a number without telling you how they arrived at it, or they bury the answer in enough caveats that you finish the article more confused than when you started.

Here's the honest starting point: 68% of working Americans say they're confident they'll meet their retirement goals — while 58% believe they'll outlive their savings. Goldman Sachs calls this the Optimism Gap. Workers feel on track day to day but fear the long-term math. It's not irrational. Retirement is genuinely complex, and most people are planning it without a clear framework.

This article gives you that framework. Two proven calculation methods, milestone benchmarks by age, the factors that change your personal number, and a real example of what the math looks like in practice.

The two frameworks that actually answer the question

Financial planners use two primary methods for estimating how much you need to retire. They're not identical, but they lead to similar answers — and understanding both gives you a range to work within.

Method 1: The 25x rule

Multiply your expected annual spending in retirement by 25. That's the portfolio you need.

The math behind this is the 4% rule, derived from the 1994 Trinity Study: a portfolio that allows you to withdraw 4% of its value in year one, then adjust for inflation each year, has historically survived 30+ years in most market conditions. At 4%, every $1,000,000 in savings generates $40,000/year.

Important caveat: the 25x rule is based on your spending in retirement, not your current income. If you plan to downsize, travel less, or pay off your mortgage before retiring, your number may be lower than you think. If you want to travel extensively or maintain a similar lifestyle, it may be higher.

Method 2: The 10x salary rule

A simpler benchmark: have 10 times your final annual salary saved by the time you retire at 67. Fidelity developed this guideline assuming you save 15% of income annually starting at 25, invest primarily in stocks, and retire at full Social Security eligibility age.

If you earn $75,000/year, the target is $750,000. If you earn $120,000, it's $1.2 million. This rule doesn't account for spending habits, debt, or lifestyle — it's a directional guide, not a precise calculation. Use it to assess whether you're in the right order of magnitude.

Milestone benchmarks by age

Rather than staring at a distant final number, track your progress against age-based milestones. Fidelity's widely adopted framework:

Where does the average American stand against these benchmarks? According to Vanguard's "How America Saves 2025" report, the median 401(k) balance for those ages 55-64 is $96,000 — well below the 8-10x target for that age group. The average is $271,000, but averages are pulled up sharply by high-balance accounts. The median tells the real story: most people approaching retirement are behind.

Separately, 58% of American workers say they're behind on retirement savings, according to Bankrate's 2025 Retirement Savings Survey. If that's you, the benchmarks above aren't a verdict — they're a navigation tool.

The 4 factors that change your personal number

The 25x rule and the 10x benchmark are starting points. Your actual number depends on four variables:

1. Retirement age

Every year you delay retirement does three things simultaneously: your portfolio has more time to grow, you have fewer years of withdrawals to fund, and your Social Security benefit increases by approximately 8% per year past full retirement age (67). Retiring at 62 versus 67 can require a portfolio 40-50% larger to produce the same annual income.

2. Lifestyle and spending

Most people need 55-80% of their pre-retirement income to maintain their lifestyle in retirement, according to Fidelity's analysis of national spending data. The lower end applies if you've paid off your mortgage, your children are independent, and you plan a simpler lifestyle. The higher end applies if you maintain similar spending or plan to travel more.

3. Healthcare costs

This is the most underestimated cost in retirement planning. Fidelity projects that a 65-year-old couple retiring in 2025 will spend approximately $345,000 on medical costs throughout retirement — a 5% increase over the previous year. That figure doesn't include long-term care, which 70% of retirees will need at some point. Healthcare alone can add $100,000-$300,000 to your retirement number depending on health status and coverage choices.

4. Social Security income

Social Security reduces the portfolio you need. The average benefit is approximately $1,975/month ($23,700/year) as of early 2025. For a couple, that can be $40,000-$50,000/year — which directly reduces how much your portfolio needs to generate. Claiming at 62 reduces your benefit by 25-30%. Delaying to 70 increases it by roughly 8% per year past 67.

Workers with a written, personalized retirement plan have 27% higher savings-to-income ratios than those without one — and 83% confidence in their retirement readiness versus 41% for those without a plan. The plan is the variable, not the income. — Goldman Sachs Asset Management Retirement Survey 2025

What the math looks like in practice

Carmen is 48, earns $85,000/year, and has $210,000 saved across her 401(k) and IRA. She plans to retire at 67 and expects to spend $60,000/year in retirement (including a paid-off mortgage and modest travel).

Using the 25x rule: $60,000 × 25 = $1,500,000 target portfolio.

Social Security will cover approximately $22,000/year, so her portfolio only needs to generate $38,000/year. That adjusts her target to $38,000 × 25 = $950,000.

She has 19 years to get from $210,000 to $950,000. At a 7% average annual return and contributing $12,000/year (roughly 14% of income including employer match), her projected balance at 67 is approximately $980,000 — just above her target.

She's not ahead of the Fidelity benchmarks — at 48, she should have 6× salary ($510,000) and has less than half that. But her personal retirement number is achievable at her current trajectory because her spending target is realistic, her Social Security reduces the portfolio burden, and she has nearly two decades of compounding ahead.

The most dangerous retirement planning mistake isn't being behind on a benchmark. It's not knowing whether your personal trajectory is on track. Those are different problems with different solutions.

If you're behind — what actually helps

Being behind on retirement savings at 40, 50, or even 60 is not a failure state. It's a starting point. The levers that move the needle most are:

• Catch-up contributions: after 50, you can contribute an extra $7,500/year to your 401(k). Ages 60-63 can add $11,250 extra annually starting in 2025 under SECURE 2.0.

• Delay retirement by 2-3 years: every additional year of work adds contributions, reduces withdrawal years, and increases Social Security benefits.

• Reduce planned spending: cutting your expected retirement spending from $70,000 to $60,000 reduces your target portfolio by $250,000 under the 25x rule.

• Optimize Social Security timing: delaying your claim from 62 to 67 increases lifetime benefits by 30-40% — one of the highest guaranteed returns available.

• Downsize housing: accessing home equity through downsizing can materially change the retirement math without requiring additional income.

None of these require earning more. They require understanding your number, knowing your trajectory, and making intentional adjustments while there's still time to compound.

Knowing your number is how retirement planning actually starts

The question "how much do I need to retire?" doesn't have a universal answer. But it has a personal one — and it's more accessible than most people think.

Start with the 25x rule applied to your expected spending. Check it against the Fidelity benchmarks by age. Adjust for Social Security, healthcare, and retirement age. Then assess your current trajectory against that target.

The Optimism Gap — confident today, afraid of outliving savings tomorrow — closes when you have a plan. Not a perfect plan. Just a framework that lets you see where you are and what your next move is.