“How much do I need to retire?” is the single most common question we hear — and most people either avoid running the numbers because it feels intimidating, or lean on an oversimplified online calculator that misses the details. Here’s a version you can actually work through yourself, plus where the simple math stops being enough.
Research shows the happiest retirees start planning at least five years before their target date. The earlier you run the numbers, the more time you have to act on what they tell you — whether that means adjusting your savings rate, your spending plan, or your target date itself.
How Much Do You Need to Retire?
Start with three numbers: your expected annual spending in retirement, your guaranteed income (Social Security, pensions, annuity income), and the gap between them.
Example. Suppose you expect to spend $115,000 a year in retirement, with $52,000 a year coming from Social Security and other fixed income. Your gap — the amount you need to withdraw from savings and investments each year — is $63,000.
When Can I Retire? A Calculator You Can Run Yourself
The simplest version of “how much do I need saved” multiplies your annual gap by the number of years you expect to need it: $63,000 × 30 years = $1,890,000. That’s the “money under the mattress” version — it assumes your savings earn nothing, either before or during retirement.
A more realistic version accounts for a modest rate of return. It can be tempting to use stock market averages here, but at least half the time you’ll earn less than average — and you won’t be invested 100% in stocks in retirement anyway. Conservative numbers are the wise way to approach this.
So assume your savings and investments earn 3% a year after inflation (roughly a 6% gross return if inflation averages 3%). At that rate, covering $63,000 a year for 30 years takes about $1,235,000 today — noticeably less than the $1,890,000 “under the mattress” figure, because your invested savings are doing some of the work alongside you.
If you have more than that saved and can reasonably expect a 3% return above inflation or better, the math says you have enough. If you have less, your levers are: work longer, save more between now and retirement, or plan to spend less.
How Much Do You Need to Retire Comfortably?
“Comfortably” is really a spending question in disguise — and the math is sensitive to small adjustments. Cutting spending by just $500 a month ($6,000 a year) lowers your annual withdrawal need to $57,000, which drops the present-value target to roughly $1,117,000 — over $100,000 less than the original target, from one modest lifestyle adjustment.
This simple version leaves out taxes, the fact that Social Security and pensions typically start at different ages than retirement itself, and the reality that most people don’t withdraw the exact same amount every year. In particular, the stretch from about age 55 to 75 — what we call the Opportunity Zone — is usually when withdrawal amounts vary the most, since income sources are phasing in and tax-planning opportunities (like Roth conversions) are often most valuable.
Am I Financially Ready to Retire?
The financial math is only half the question. The other half is what you’re retiring to, not just what you’re retiring from. If retirement looks like an escape hatch from a job you don’t enjoy, it’s worth asking honestly whether the real fix is retirement, or a different role. We’ve worked with future retirees who, once they stopped working, missed the social interaction and sense of purpose their job provided more than they expected to.
Being financially ready and being emotionally ready are both real prerequisites — and the financial plan is what gives you the freedom to make the emotional decision without money anxiety clouding it.
Will My Retirement Savings Last?
This is where the simple calculations above reach their limit. A single present-value number tells you whether you’re in the right neighborhood, but it can’t tell you how a specific sequence of returns, a specific Social Security claiming decision, or a specific tax-bracket strategy will actually play out over 30 real years, not 30 average ones.
A full retirement income plan builds in the variables the quick math leaves out: the timing of Social Security claiming, the order you draw from taxable, tax-deferred, and Roth accounts, and how required minimum distribution planning in your 70s connects back to decisions made in your 60s or even 50s.
Getting an Answer You Can Trust
The math above will get you close — close enough to know whether you’re on track or need to adjust. But “close” and “confident” aren’t the same thing, especially once real variables like taxes, market sequence, and claiming strategy enter the picture.
At Sensible Money, we build a full retirement income plan around your specific numbers, not a generic rule of thumb — and often, clients are surprised to find they’re closer to ready than the simple math suggested. If you want a clear answer to “how much do I need to retire” and “will my money last,” that’s the starting point of every plan we build.
