“You need a million dollars to retire” is repeated so often it’s practically background noise, but it’s a generic number that ignores your actual spending, location, and retirement age. Someone planning to spend $40,000 a year in a low-cost area needs a very different nest egg than someone planning to spend $100,000 a year with extensive travel.

Here’s a more precise way to calculate your actual retirement number.

Start With Your Expected Annual Spending, Not Your Current Income

A common mistake is basing retirement calculations on current income rather than expected retirement spending. Many expenses shrink in retirement (commuting costs, retirement account contributions, sometimes a paid-off mortgage), while others may grow (healthcare, travel, hobbies). Estimate your actual expected annual spending in retirement as the starting point, not a percentage of your current salary.

The 25x Rule (Based on the 4% Withdrawal Rate)

A widely used starting formula multiplies your expected annual spending by 25, based on the idea that withdrawing 4% of your portfolio annually has historically had a strong chance of lasting 30 years without depleting the principal.

Retirement Number = Annual Spending Need × 25

Annual Spending Need	Retirement Number (25x)
$40,000	$1,000,000
$60,000	$1,500,000
$80,000	$2,000,000
$100,000	$2,500,000

This is a helpful starting estimate, but it assumes a fairly standard 30-year retirement horizon and a diversified portfolio, so it should be adjusted for your specific circumstances.

Subtract Guaranteed Income Sources

Your retirement number should reflect the gap between your spending needs and your portfolio withdrawals, not your total spending. Subtract expected guaranteed income, like Social Security benefits or a pension, from your annual spending need before applying the 25x multiplier.

Adjusted Retirement Number = (Annual Spending Need − Guaranteed Income) × 25

For example, someone expecting $80,000 in annual spending with $30,000 in Social Security benefits would only need to fund the remaining $50,000 gap from savings: $50,000 × 25 = $1,250,000, considerably less than the unadjusted $2,000,000 figure.

Adjust for Your Retirement Age and Life Expectancy

The 25x rule assumes roughly a 30-year retirement. If you plan to retire earlier, in your 50s, for example, your money needs to last longer, which may call for a larger cushion or a more conservative withdrawal rate. If you plan to retire later or have reason to expect a shorter retirement horizon, you may need a somewhat smaller number.

Don’t Forget Healthcare Costs

Healthcare is one of the most commonly underestimated retirement expenses, particularly before Medicare eligibility if you retire early, and even after, given Medicare doesn’t cover everything. Build a realistic healthcare cost estimate into your annual spending figure rather than assuming it will be minor.

Location Changes the Math Significantly

Where you plan to live in retirement dramatically affects how much you need. The same $60,000 annual spending target stretches very differently in a low-cost area compared to a high-cost city. If you’re considering relocating in retirement, whether to a lower-cost area domestically or abroad, factor that into your target number rather than planning around your current location’s costs.

Account for Inflation Along the Way

If you’re years or decades from retirement, remember that your target number needs to grow with inflation between now and your retirement date. A $1.5 million target today represents meaningfully less purchasing power in 20 or 30 years, so retirement calculators that project your savings forward should also inflate your spending target accordingly.

Building Toward Your Number

Once you have a target, work backward to a savings rate. Online retirement calculators can model this based on your current savings, expected returns, and years until retirement, but a simple starting benchmark is aiming to save 15% or more of your income annually, adjusting upward if you’re starting later or have an aggressive retirement age goal.

Revisit Your Number Regularly

Your retirement number isn’t a one-time calculation. Revisit it every few years, or after major life changes like a new job, a paid-off mortgage, or a shift in your planned retirement age, since your actual spending needs and guaranteed income sources evolve over time.

Frequently Asked Questions

Is the 4% rule still considered reliable?

It remains a widely used starting point, though some financial planners now suggest a slightly more conservative withdrawal rate, especially for early retirees with longer time horizons, given uncertainty about future market returns.

How does Social Security factor into my retirement number?

Subtract your expected annual Social Security benefit from your total spending need before applying the 25x multiplier, since Social Security reduces how much your portfolio alone needs to cover.

Do I need less if I retire debt-free with a paid-off mortgage?

Yes, a paid-off mortgage significantly reduces your annual spending need, which directly lowers your target retirement number under the 25x calculation.

What if I want to leave an inheritance?

If leaving money behind matters to you, plan for a lower withdrawal rate than 4%, or build a larger cushion above your calculated number, since the standard 4% rule is designed to draw the portfolio down over a set horizon, not necessarily preserve a large balance.

Final Thoughts

Your real retirement number comes from your actual expected spending, adjusted for guaranteed income, healthcare costs, location, and your planned retirement age, not a generic million-dollar headline. Running this calculation with your specific numbers, and revisiting it periodically as your life changes, gives you a target that’s actually meaningful to plan and save toward.