Coast FIRE Calculator 2026: Stop Saving for Retirement and Still Retire at 65

What if you could stop saving for retirement — not in 30 years, but in the next few years — and still retire comfortably at 65? That is the promise of Coast FIRE, the most practical milestone in the FIRE (Financial Independence, Retire Early) movement. Searches for Coast FIRE calculators jumped 173% year over year in 2026, and it is easy to see why: it is the first FIRE milestone most people can actually reach, often 10 to 15 years before traditional retirement age.

Coast FIRE does not mean you stop working. It means your investments have grown large enough that compound growth alone will carry them to your full retirement goal by age 65 — with zero further contributions. From that day on, every dollar you earn is for living, not for the future. You can take a lower-paying job you actually enjoy, go part-time, start a business, or simply breathe easier. This guide explains the Coast FIRE formula, shows your number by age, and walks through five steps to reach it.

What Is Coast FIRE?

Coast FIRE is the point where your invested nest egg is big enough that, even if you stopped contributing today, compound growth alone would grow it into a full retirement pot by your target retirement age. You still need to work and cover your rent, food, transport, and other living costs — but you no longer need to save for retirement.

Think of it this way. Traditional FIRE asks you to save 25 times your annual expenses and then stop working entirely. That is a huge ask: if you spend $50,000 a year, you need $1.25 million before you can quit. Coast FIRE asks a much smaller question: how much do you need invested today so that compounding does the rest of the work over the next 20, 30, or 40 years? For a 30-year-old, the answer can be under $100,000 — a number that feels reachable instead of impossible.

That is why Coast FIRE is often called the most life-changing milestone in personal finance. It does not require you to retire early. It gives you freedom now: the freedom to choose work you like, to spend on what matters, and to stop worrying that every dollar must be saved.

The Coast FIRE Formula

The maths behind Coast FIRE is a single line:

Coast FIRE Number = Retirement Goal ÷ (1 + r)^t

Here is what each part means:

• Retirement Goal — the total nest egg you need at retirement. A common rule of thumb is the 4% rule: multiply your expected annual retirement spending by 25. Spend $40,000 a year in retirement, and your goal is $1,000,000.
• r — your expected annual real return (after inflation), as a decimal. Most Coast FIRE calculations use 7%, the long-run average real return of the US stock market.
• t — the number of years until your retirement age.

Worked example

Say you are 35, you want $1,000,000 by age 65, and you assume a 7% real return. That is 30 years of compounding:

Coast FIRE Number = $1,000,000 ÷ (1.07)³⁰ = $1,000,000 ÷ 7.612 = $131,367

If you have $131,367 invested at 35 and you never add another dollar, it grows to $1 million by 65 at a 7% return. Every dollar you save after that is a bonus — it brings retirement earlier or makes it more comfortable. The younger you are, the smaller your number, because time does the heavy lifting.

Your Coast FIRE Number by Age

The table below shows what you need invested today to coast to three different retirement targets by age 65, assuming a 7% real return and no further contributions. Find your age, pick your target, and you have your number.

Your age now	Years to 65	$1M target	$1.5M target	$2M target
25	40	$66,780	$100,171	$133,561
30	35	$93,663	$140,494	$187,326
35	30	$131,367	$197,051	$262,734
40	25	$184,249	$276,374	$368,498
45	20	$258,419	$387,629	$516,838
50	15	$362,446	$543,669	$724,892

Notice how steep the curve is. A 25-year-old needs only about $67,000 to coast to $1 million, while a 50-year-old needs $362,000 for the same goal. That is the power — and the urgency — of starting early. Even a five-year head start cuts your number by roughly a third.

One popular shorthand captures the same idea: $200,000 invested at age 30 grows to roughly $2.1 million by 65 at 7% real return. The exact figure depends on your assumptions, but the message is the same — a surprisingly modest sum, left alone for decades, becomes a retirement fund.

Coast FIRE vs Regular FIRE: What Is the Difference?

Coast FIRE is one branch of the FIRE family. Here is how it compares with the better-known versions:

Type of FIRE	What it means	When you stop saving	When you stop working
Coast FIRE	Investments alone will reach your goal by 65	As soon as you hit your number	At normal retirement age (or earlier, if you keep saving)
Lean FIRE	Retire on a bare-bones budget, usually under $40,000 a year	At retirement	Early, but frugally
Regular FIRE	Save 25x annual spending, then retire	At retirement	Early, often in your 40s or 50s
Fat FIRE	Retire early on a generous budget, often $100,000+ a year	At retirement	Early, in comfort

Coast FIRE is by far the easiest to reach. Regular FIRE demands the full nest egg before you can stop working; Coast FIRE only demands the discounted version of it. For most working professionals who save aggressively in their 20s and early 30s, Coast FIRE arrives by age 35 — a full decade or more before they could fully retire. That is why it has become the entry point to the FIRE movement in 2026.

How Do Average Savers Compare?

So how close is the average American to Coast FIRE? Fidelity Investments' Q2 2026 retirement analysis — covering 25.6 million 401(k) participants — reported a record-high average 401(k) balance of $155,800, with the average total savings rate (employee plus employer contributions) holding at 14.4%, just below Fidelity's recommended 15%.

Average balances by age tell the real story:

• 20s: $22,800 average 401(k) balance
• 30s: $75,200 — close to the $93,663 a 30-year-old needs to coast to $1 million
• 40s: $156,800 — below the $184,249 a 40-year-old needs for the same goal
• 50s: $263,500 — just above the $258,419 a 45-year-old needs
• 60s: $281,200

The encouraging news: the average saver in their 30s is already within striking distance of Coast FIRE for a $1 million target. The sobering news: averages are pulled up by a small number of very large accounts. Vanguard's How America Saves 2026 report puts the median 401(k) balance at just $44,115 overall — far below the average — and many Americans have no retirement account at all. If you are above the median for your age, you are further ahead than you think. If you are below it, the five steps below show how to close the gap.

Before you start, make sure your financial foundation is solid. If you do not yet have an emergency fund, build one first — three to six months of expenses in a high-yield savings account — so a surprise bill never forces you to raid your investments. Our guide on how to build an emergency fund fast walks through the steps. And if you are starting from zero, our guide on how to invest $1,000 for high returns shows how to put your first thousand to work.

5 Steps to Reach Coast FIRE

1. Work out your full FIRE number first

Start with your spending, not your salary. Estimate what you will spend per year in retirement, then multiply by 25 (the 4% rule). If you expect to spend $40,000 a year, your target is $1,000,000. If you expect $60,000, it is $1,500,000. Be honest about healthcare and housing — the two costs people underestimate most. Remember that Social Security can cover part of your retirement spending, which lowers the amount your investments need to provide.

2. Calculate your Coast FIRE number

Divide your full FIRE number by (1.07) raised to the years until you turn 65. Any compound interest calculator can do this in seconds: enter your Coast FIRE number as the starting principal, $0 monthly contribution, 7% return, and your years to retirement. If the future value equals your goal, you have found your number. You can also use the table above as a shortcut.

3. Front-load your saving while you are young

Coast FIRE rewards early, aggressive saving more than any other strategy. Max out your 401(k) — at least enough to capture the full employer match, which is free money — and fund a Roth IRA if you are eligible. Every dollar invested in your 20s is worth roughly $15 at 65 at a 7% real return. If your employer offers a match and you stop contributing after hitting Coast FIRE, check whether the match stops too; in some plans it does, which is worth knowing before you ease off.

4. Invest in low-cost, diversified index funds

Coast FIRE only works if your money actually compounds at something close to the assumed return. That means broad-market, low-cost index funds — not stock picking, not timing the market, and not cash sitting in a savings account earning 4%. Keep your fees low, stay invested through market drops, and rebalance once a year. For extra income ideas while your investments grow, see our guide to the top passive income streams.

5. Stress-test your plan before you stop contributing

Never quit saving on a spreadsheet alone. Run your numbers at a 5% real return, not just 7%. The difference is dramatic: $200,000 invested at 30 grows to about $2.1 million by 65 at 7%, but only about $1.1 million at 5% — a shortfall of nearly half. If your plan still works at 5%, you have a real margin of safety. Re-check your number once a year, and keep saving if a market downturn or a career change puts you behind.

The Risks: Read This Before You Stop Saving

Coast FIRE looks effortless in a spreadsheet, but the risks live in the assumptions it ignores. Four deserve your attention:

• Returns may be lower than 7%. The 7% real return is a historical US average, not a guarantee. The next 30 years could be worse. Stress-test at 4–5% before you stop contributing, and keep a buffer.
• Inflation and lifestyle creep. Your Coast FIRE number is in today's dollars. If your spending rises faster than inflation — a bigger house, children, new tastes — your retirement target rises with it, and your number is no longer enough.
• Healthcare costs. If you leave a full-time job for part-time or freelance work, you may lose employer health insurance. In the US, buying coverage privately can cost hundreds of dollars a month, which eats into the freedom Coast FIRE is supposed to buy.
• Sequence of returns in retirement. Coast FIRE protects you during the accumulation years, because you are not withdrawing anything. But once you start drawing down after 65, a bad first decade of returns can still damage your portfolio. Plan the withdrawal phase separately — the 4% rule is a starting point, not a promise.

None of this makes Coast FIRE a bad idea. It makes it a milestone to reach with your eyes open — and a reason to keep saving a little even after you hit your number, at least until the margin of safety feels comfortable.

Frequently Asked Questions

Does Coast FIRE mean I can retire now?

No. Coast FIRE means you can stop saving for retirement, not stop working. You still need income to cover your living costs until you retire. What changes is that your job only has to pay today's bills — it no longer has to fund your future as well.

How much do I need to be Coast FIRE?

It depends on your age and your retirement target. At a 7% real return and retirement at 65, a 30-year-old needs about $94,000 to coast to $1 million, a 35-year-old needs about $131,000, and a 40-year-old needs about $184,000. Use the formula — target divided by (1.07) raised to your years until retirement — or the table above to find your number.

Is 7% a safe return assumption?

Seven percent is the long-run historical real return of the US stock market, but it is not guaranteed. Many planners recommend stress-testing at 5% real return before you stop contributing. At 5%, your Coast FIRE number is significantly higher, so a plan that works at both 5% and 7% has a genuine margin of safety.

Should I stop contributing to my 401(k) once I hit Coast FIRE?

You can, but think twice. Stopping personal contributions may also stop your employer match in some plans, and continuing to save brings full retirement earlier. Many people who hit Coast FIRE keep contributing at a lower rate, or redirect the money toward other goals like a house deposit or a sabbatical fund.

What is the difference between Coast FIRE and Barista FIRE?

Coast FIRE means your investments will reach your goal on their own and you keep working to cover current expenses. Barista FIRE is a step further: you have saved enough to retire from full-time work but take a part-time job — the classic example is working at a coffee shop — mainly for income and health insurance until your investments fully mature.

Conclusion

Coast FIRE is the most reachable milestone in the FIRE movement, and that is exactly why it is trending in 2026. You do not need a million dollars today. A 30-year-old with roughly $94,000 invested — and a 35-year-old with roughly $131,000 — can stop saving for retirement and still retire at 65, as long as the money stays invested and compounds at a reasonable rate. The earlier you hit your number, the more freedom you buy: the freedom to choose work you enjoy, to work less, or simply to stop worrying.

Start by calculating your number today. If you are already close, a year or two of focused saving could get you there. If you are far away, remember that the average saver in their 30s already holds about $75,000 in a 401(k) — closer than most people realise. Front-load your saving, keep your costs low, stress-test at 5%, and let time do the rest.

Sources: Compound Ladder — Coast FIRE Calculator 2026; Kiplinger — The Average 401(k) Balance by Age and Generation in 2026 (Fidelity Q2 2026 data); Investopedia — The Average 401(k) Balance by Age (Vanguard How America Saves 2026); Rising Trends — Top 50 Personal Finance Trends, November 2026

Disclaimer: This article is for education only and is not financial advice. Retirement planning involves assumptions about returns, inflation, and your personal circumstances that may change. Consider speaking with a licensed financial advisor before making decisions about your retirement savings.