How Much Do I Need to Retire? The Replacement Ratio, the 25x Rule, and Savings by Age

A common starting answer is that you need enough savings to replace about 70% to 80% of your pre-retirement income, which usually works out to a nest egg roughly 25 times the amount you plan to withdraw from savings each year. That is the short version. The longer version is that your real number depends on the life you want, how long you live, and how much of your income comes from Social Security and any pension. The good news is that you can put a defensible figure on it in about three steps.

When I first tried to answer this for myself, the number felt impossibly vague, like asking how long a piece of string is. It is not, once you separate “the income I want” from “the savings that have to provide it.” Here is the method, checked by a CERTIFIED FINANCIAL PLANNER. For how this fits the rest of the plan, start with the pillars of retirement income.

Start with the income you want: the replacement ratio

The first step is to estimate the yearly income you will want, not the lump sum. The standard guide is the replacement ratio: aim to replace about 70% to 80% of your pre-retirement income each year. The figure is below 100% because some costs fall when you stop working: you no longer save for retirement, you stop paying Social Security payroll tax on wages, the commute and work wardrobe go, and the mortgage may be gone.

It is only a starting point. Someone planning lots of travel, or facing high health costs, might need 90% or more; someone with a paid-off house and simple tastes might do well on 60%. So if you earn $80,000 now, a reasonable first target is roughly $56,000 to $64,000 a year in retirement. Adjust it up or down to match the life you actually picture.

Turn income into a number: the 25x rule

Now convert that yearly income into a savings target with the 25x rule: multiply the amount you need from your own savings each year by 25. The rule is the flip side of the 4% rule: if you withdraw about 4% of a pot in the first year, that is the same as needing 25 times that withdrawal.

The key word is “from your own savings.” You do not need to fund your whole income from investments, because Social Security and any pension cover part of it. So the math runs like this:

1. Target income: say $60,000 a year.
2. Subtract guaranteed income: say $24,000 a year from Social Security.
3. The gap your savings must fill: $36,000 a year.
4. Multiply by 25: a target nest egg of about $900,000.

That last figure is the real “retirement number.” Notice how much Social Security shrinks it; without it, the same income would need a pot of $1.5 million.

Do not forget Social Security

Because Social Security does so much heavy lifting, you cannot estimate your number without it. The average benefit is about $2,071 a month in 2026, and the maximum at full retirement age is about $4,152 a month. When you claim matters too: claiming at 62 permanently reduces the check, while waiting toward 70 grows it by about 8% a year past full retirement age.

The single most useful move here is to log in at ssa.gov and read your own estimate rather than guessing. I put off doing this for years and was genuinely relieved by what I saw. Walk through it in your Social Security statement, and weigh the timing in when to claim Social Security and social security explained.

A progress check: savings by age

Targets are easier to act on if you have milestones along the way. A widely-cited guide from Fidelity gives rough savings-by-age benchmarks, expressed as a multiple of your current salary:

Age	Target saved
30	about 1x salary
40	about 3x salary
50	about 6x salary
60	about 8x salary
67	about 10x salary

If you are behind, you have plenty of company, and the picture is rarely as bad as it feels. Catch-up contributions after 50, a couple of extra working years, and the fact that investments compound fastest in the final decade can all close a surprising gap. We turn these targets into a savings plan in how much to save for retirement.

Why these are rules of thumb, not promises

Every figure here is a planning anchor, not a guarantee. The 4% and 25x rules came from historical US market data and assume a roughly 30 year retirement and a balanced mix of stocks and bonds. Three things can move your real number a lot: inflation, which raises what you need every year; longevity, because a retirement that lasts 35 years needs more than one that lasts 20; and returns, because your savings are invested and the value can lose money.

That is exactly why these are starting estimates. Build in a margin, revisit the number as life changes, and treat a single tidy figure with healthy suspicion. We cover the long-run threats in inflation and retirement and making your money last.

Your three-step number

Pulling it together, you can estimate your retirement number in three steps: pick a target yearly income (around 70% to 80% of today’s), subtract your expected Social Security and pension, then multiply the remaining gap by 25. That gives a defensible target to save toward, and a way to see whether retiring at the age you hope for is realistic.

This is general information, not personalized financial advice, and your own number deserves a closer look. For a plan built around your spending, health, and timing, a fiduciary advisor can run the detailed projections; see choosing a financial advisor. The free calculators at SSA.gov and Investor.gov are a solid, unbiased place to begin.