How much do you need saved today so your investments grow to your FIRE number — without adding another dollar?
Enter your details and click Calculate to see your Coast FIRE number, FIRE target, and growth chart.
Based on 4% SWR rule. For educational use only — not financial advice.
Coast FIRE is a milestone on the path to financial independence where you have saved enough money that — even if you never contributed another dollar — your investments would grow to your full FIRE number by your target retirement age. Once you hit your Coast FIRE number, you only need to earn enough to cover your current living expenses.
The word "coast" is the key: your money coasts on its own, powered by compound interest, while you work however much (or little) you want.
FIRE Number = Annual Expenses × 25 (based on the 4% Safe Withdrawal Rate)
Coast FIRE Number = FIRE Number ÷ (1 + annual return)years to retirement
This tells you how much you need invested today so compound interest carries you to your FIRE number by retirement.
Find your FIRE number and years to full financial independence.
Project your retirement corpus and monthly income using compound interest.
See how compound interest grows your money over any time horizon.
Calculate your safe annual withdrawal and how large your portfolio needs to be.
Coast FIRE is one of the most powerful and liberating concepts in the Financial Independence, Retire Early (FIRE) movement. Unlike traditional FIRE — where the goal is to accumulate enough wealth to stop working entirely — Coast FIRE is a milestone you can hit years or even decades earlier. Once you reach your Coast FIRE number, your invested assets will grow to your full FIRE number by retirement age entirely on their own, powered by compound interest. You don't need to save or invest another single dollar for retirement.
The name comes from the idea of "coasting" — like a cyclist who has pedaled hard to get up to speed and can now take their feet off the pedals and coast the rest of the way. Your money does the work while you focus on living your life.
The Coast FIRE calculator above does all the math instantly. But understanding the concept deeply will help you use it more effectively, set realistic targets, and make informed decisions about your financial future.
Every Coast FIRE calculation starts with your FIRE Number:
FIRE Number = Annual Expenses in Retirement × 25
This is based on the 4% Safe Withdrawal Rate (SWR) rule, which states that withdrawing 4% of a diversified investment portfolio annually has historically sustained that portfolio for 30+ years across nearly all market conditions.
Once you know your FIRE Number, your Coast FIRE Number is:
Coast FIRE Number = FIRE Number ÷ (1 + Annual Return Rate)Years to Retirement
This formula works backwards from your FIRE Number using the principle of present value — it tells you how much money, invested today at your expected return rate, will grow to equal your FIRE Number by your target retirement age.
Example: You plan to spend $50,000/year in retirement. Your FIRE Number = $50,000 × 25 = $1,250,000. You're 30 years old, plan to retire at 65, and expect 7% annual returns. Your Coast FIRE Number = $1,250,000 ÷ (1.07)35 = $131,748. If you have $131,748 invested today, you never need to invest another dollar for retirement — it will grow to $1.25M by age 65.
Our free Coast FIRE calculator makes it easy to find your number in seconds. Here's what each field means and what values to enter:
The following tables show Coast FIRE Numbers for different scenarios. Use these as reference points to see how close you are — or how the numbers change with different assumptions.
FIRE Number: $1,250,000
| Your Current Age | Years to Retirement | Coast FIRE Number | Monthly Contribution to Hit It in 5 Years |
|---|---|---|---|
| 25 | 40 | $93,218 | ~$1,250/mo |
| 30 | 35 | $131,748 | ~$1,900/mo |
| 35 | 30 | $186,128 | ~$3,000/mo |
| 40 | 25 | $263,063 | ~$4,700/mo |
| 45 | 20 | $371,816 | ~$7,700/mo |
| 50 | 15 | $525,486 | ~$13,000/mo |
Key insight: Every year you delay reaching Coast FIRE, your Coast FIRE Number increases by roughly 7% (your expected return). At 30, your Coast FIRE target is $131K. At 35, it's $186K — 41% higher. Start as early as possible.
| Annual Expenses | FIRE Number | Coast FIRE Number at 30 | Coast FIRE Number at 35 | Coast FIRE Number at 40 |
|---|---|---|---|---|
| $30,000/yr | $750,000 | $79,049 | $111,677 | $157,838 |
| $40,000/yr | $1,000,000 | $105,399 | $148,903 | $210,451 |
| $50,000/yr | $1,250,000 | $131,748 | $186,128 | $263,063 |
| $60,000/yr | $1,500,000 | $158,098 | $223,354 | $315,676 |
| $80,000/yr | $2,000,000 | $210,797 | $297,805 | $420,902 |
| $100,000/yr | $2,500,000 | $263,497 | $372,256 | $526,127 |
| Annual Return Rate | Coast FIRE Number | Difference vs 7% |
|---|---|---|
| 5% | $232,568 | +76% higher |
| 6% | $176,330 | +34% higher |
| 7% | $131,748 | baseline |
| 8% | $98,344 | -25% lower |
| 10% | $54,837 | -58% lower |
| 12% | $30,407 | -77% lower |
The FIRE movement has many variations, and understanding the differences helps you choose the right target for your lifestyle.
Traditional FIRE means accumulating your full FIRE Number — 25× annual expenses — and retiring completely. You live entirely off investment returns with no employment income whatsoever. This takes the most time and discipline, but provides the most freedom. Typical timeline: 10–20 years of aggressive saving.
Hit your Coast FIRE Number early, then work only enough to cover present-day expenses. Your investments grow to your FIRE Number on autopilot. You don't need a high-paying job — you could work part-time, take a lower-stress role, travel, freelance, or pursue passion projects. Timeline: often achievable 10–15 years before traditional FIRE.
Similar to Coast FIRE, but specifically involves taking a part-time job (often cited as a coffee shop, hence "barista") primarily for health insurance benefits. Common in the US where employer health insurance is a major financial consideration. The investment portfolio is partially built but not yet at the Coast FIRE level.
Full financial independence, but on a very frugal budget — typically $25,000–$40,000/year or less. Lean FIRE is achievable much faster than Fat FIRE because the FIRE Number is smaller. Popular among minimalists, travelers, and those in low-cost-of-living areas.
Full financial independence with a generous lifestyle — $80,000–$150,000+/year in retirement spending. Requires a much larger portfolio ($2M–$4M+) but provides maximum flexibility in retirement. Target for those who don't want to significantly reduce their current lifestyle.
| FIRE Type | Annual Spending | Portfolio Needed | Lifestyle | Typical Timeline |
|---|---|---|---|---|
| Lean FIRE | $25,000–$40,000 | $625K–$1M | Minimalist, frugal | 10–15 yrs |
| Coast FIRE | Current expenses (still working) | Fraction of FIRE Number | Work what you want | 5–12 yrs |
| Barista FIRE | Current + part-time | 50–75% of FIRE Number | Part-time work | 8–14 yrs |
| Regular FIRE | $40,000–$80,000 | $1M–$2M | Flexible, comfortable | 15–20 yrs |
| Fat FIRE | $80,000–$150,000+ | $2M–$3.75M+ | Luxurious | 20–30 yrs |
The savings rate is the most powerful variable in your Coast FIRE timeline. Saving 50% of income instead of 25% doesn't just double how fast you save — it also dramatically reduces your FIRE Number (because lower spending means lower expenses to fund in retirement). A 50% savings rate on a $70,000 income means saving $35,000/year and spending $35,000/year — a FIRE Number of just $875,000 instead of $1.75M for a 25% saver.
Maximize tax-advantaged accounts before investing in taxable brokerage accounts. In the US: 401(k) up to employer match → HSA → Roth IRA → back to 401(k) up to limit → taxable brokerage. The tax savings compound alongside your investment returns, dramatically accelerating your path to Coast FIRE.
Housing, transportation, and food account for 50–70% of most people's budgets. Reducing these has a double benefit: you save more AND your FIRE Number shrinks. Moving to a lower cost-of-living area, house hacking (renting part of your home), driving a used car instead of financing a new one, and cooking at home can each shave years off your Coast FIRE timeline.
Coding, sales, marketing, data analysis, and skilled trades command premium pay. A $20,000/year income increase, invested consistently, can shave 3–5 years off your Coast FIRE timeline. Side hustles, freelancing, or a higher-paying job all move the needle faster than extreme frugality alone.
Many Coast FIRE achievers live in lower-cost areas or countries after leaving their high-earning careers. If your investments are in US dollars or euros, relocating to Southeast Asia, Eastern Europe, or Latin America dramatically lowers the annual expenses your Coast FIRE portfolio needs to eventually cover.
A 1% expense ratio vs a 0.05% expense ratio on a $200,000 portfolio costs you $1,900/year in fees. Over 35 years at 7% growth, those lost fees compound to over $260,000 in lost wealth. Use Vanguard, Fidelity, or Schwab index funds — VTI, VOO, FZROX — not actively managed funds.
Market crashes feel terrible but are actually buying opportunities. Continuing to invest at the same rate during a 30% market correction means you're buying the same assets at 30% off. Your Coast FIRE timeline shortens when you buy cheap and sell never. Automate contributions so emotion doesn't derail your plan.
For a person spending $50,000/year in retirement planning to retire at 65 with 7% annual returns, here's a benchmark for what their Coast FIRE Number looks like at each age — and what a realistic Coast FIRE journey looks like:
| Age | Coast FIRE Number | Saving $2,000/mo Since 22 | Coast FIRE Status |
|---|---|---|---|
| 22 | $68,438 | $0 | Not yet |
| 25 | $93,218 | ~$79,000 | Close |
| 27 | $108,789 | ~$122,000 | ✅ Coasted! |
| 30 | $131,748 | ~$184,000 | ✅ Well past |
| 35 | $186,128 | ~$353,000 | ✅ Approaching Barista FIRE |
| 40 | $263,063 | ~$598,000 | ✅ Approaching regular FIRE |
Scenario: Someone starts investing $2,000/month at age 22 in index funds averaging 7% returns. By age 27 — just 5 years later — they've hit their Coast FIRE Number. They're only 27 years old and their retirement is already funded. They can now redirect those $2,000/month toward enjoying life, working less, or any other goal.
Reaching Coast FIRE is a milestone, not a finish line — but it is a liberating one. Here's what your options look like once you've coasted:
Coast FIRE projections assume a consistent average annual return (typically 7–10%). Real markets don't move in straight lines — they fluctuate dramatically year to year. Here's how to think about market risk in the context of Coast FIRE:
Sequence of Returns Risk: A major market decline in the years just before you reach Coast FIRE could temporarily set you back. The solution is to either use a conservative return estimate (6% instead of 10%) or maintain a small buffer above your Coast FIRE Number before truly "coasting."
Long time horizons reduce risk: If you're 30 years from retirement, short-term volatility is almost irrelevant. Time in the market smooths out returns. The longer your investment horizon, the more reliably the historical 7% average holds.
Consider a 10–15% buffer: Instead of stopping contributions the moment you hit your calculated Coast FIRE Number, continue for an additional 1–2 years to build a safety margin. A Coast FIRE Number of $131,000 becomes more comfortable at $150,000.
Alex earns $120,000/year as a software engineer and saves $4,500/month ($54,000/year). After 6 years of working (starting at 22), Alex has $412,000 invested. With a planned retirement at 65 and 7% returns, Alex's Coast FIRE Number was $93,218 (age 25 calculation). Alex hit Coast FIRE at 25, continued investing until 28, and now works part-time as a freelance developer earning $50,000/year — more than enough to cover $40,000 in annual expenses. The $412,000 portfolio will grow to $4.4M by age 65 — far more than the $1M FIRE Number.
Priya earns $52,000/year as a teacher and saves $1,200/month. By age 35, she has $180,000 invested. Her retirement expenses will be $40,000/year (FIRE Number: $1,000,000). At 7% returns, her Coast FIRE Number at 35 (retiring at 65) is $148,903. Priya has already passed her Coast FIRE Number. She continues teaching because she loves it — not because she has to. Knowing retirement is funded reduces her financial anxiety and improves her quality of life immediately.
Mohammed starts investing at 40 with $80,000 saved. He earns $95,000 and saves $3,000/month. His planned expenses are $60,000/year (FIRE Number: $1,500,000), retiring at 67. His Coast FIRE Number at 40 (27 years to retirement) is $273,000. At $3,000/month with 7% returns, Mohammed reaches his Coast FIRE Number in approximately 4 years (at age 44). Then he can relax his savings rate, start his own business, or transition to less stressful work.
Understanding Coast FIRE through real examples is far more powerful than abstract math. Here are detailed scenarios showing how different people across different income levels and ages can realistically achieve Coast FIRE.
Samantha earns $72,000/year as an RN. She started investing at 22, contributing $1,200/month to her 403(b) and Roth IRA. By age 30, her combined accounts have grown to $158,000. She plans to retire at 65 and estimates $45,000/year in retirement expenses. Her FIRE Number is $1,125,000. At 7% returns with 35 years to retirement, her Coast FIRE Number is $124,870. At $158,000 invested — she's already past it! Samantha doesn't realize she hit Coast FIRE two years ago. Now she can reduce her monthly contributions, pick up per-diem shifts instead of full-time, and pursue travel nursing she's been postponing.
Marcus (age 33) and Diane (age 32) both work in tech, combined income $200,000. They've been saving aggressively since 26 — $8,000/month combined between their 401(k)s and brokerage account. Total investments: $580,000. Their planned retirement expenses: $80,000/year. FIRE Number: $2,000,000. Marcus's Coast FIRE Number at 33 (retire at 60, 7% returns, 27 years): $340,000. Diane's: $325,000. Combined they need: ~$665,000. They have $580,000 — they're 85% of the way to joint Coast FIRE. At their current savings rate, they'll hit Coast FIRE in 8 months. After that, they plan to quit their high-stress jobs and move to Lisbon, Portugal, working remotely as consultants at half the hours.
Kevin started his FIRE journey at 42 with just $35,000 saved. He earns $95,000 as a project manager and starts aggressively saving $4,000/month. His retirement target: $60,000/year at age 67 (25 years away). FIRE Number: $1,500,000. Coast FIRE Number at 42 with 25 years at 7%: $296,590. Starting from $35,000, Kevin needs to save $296,590 − $35,000 = $261,590 more. At $4,000/month with 7% compounding, he reaches this amount in about 4.5 years — hitting Coast FIRE at age 46.5. For the next 20 years, he only needs to earn enough to cover living expenses. He transitions to consulting work at age 50, working 25 hours/week while easily covering his $5,000/month expenses.
The financial mathematics of Coast FIRE are straightforward. But the psychological transformation is what makes it truly life-changing. Many Coast FIRE achievers describe a moment when they realized their retirement was already secured — and the feeling is described as simultaneously anticlimactic and profound.
Reduced workplace anxiety: When you know you don't need your job for retirement, your relationship with work fundamentally changes. You can speak your mind in meetings. You can decline unreasonable projects. You can ask for what you're worth. The power dynamic shifts.
Career risk-taking becomes possible: Want to try starting a business? Apply for a job at half the salary but twice the meaning? Take a year off for a creative project? Coast FIRE makes these choices financially viable without endangering your retirement.
The permission to stop optimizing: Many high achievers feel constant pressure to maximize every financial decision. After reaching Coast FIRE, many find they can relax their money habits — buy the slightly nicer wine, take the vacation, give generously — because the retirement math is already solved.
Improved relationships: Financial stress is one of the top causes of relationship conflict. Once retirement is secured, many couples report dramatically improved relationship quality. The underlying anxiety that money problems create simply disappears.
Where your Coast FIRE savings are held matters enormously. Tax-advantaged accounts grow faster because gains aren't reduced by annual tax drag. Here's how to structure your Coast FIRE savings for maximum efficiency:
For Coast FIRE specifically, Roth accounts have a key advantage: Roth contributions (not earnings) can be withdrawn at any time, tax and penalty-free. This provides a bridge in early semi-retirement before you can access traditional retirement accounts at 59.5. Many Coast FIRE achievers front-load Roth contributions in their 20s precisely for this accessibility.
Inflation is the silent threat to all long-term financial plans. At 3% annual inflation, the purchasing power of $1 today becomes $0.41 in 30 years. Here's how to account for inflation in your Coast FIRE planning:
If the S&P 500 returns 10% nominally and inflation is 3%, the real return is approximately 7%. Enter 7% in the calculator and use today's dollar expenses as your retirement expense estimate. This is the most common and intuitive approach — the one used throughout this guide.
Enter a nominal return rate (10%) but adjust your annual retirement expenses upward for inflation. If you need $50,000/year today and retire in 30 years at 3% inflation, you'll need $50,000 × (1.03)30 = $121,363/year in future dollars. Use 10% return and $121,363 expenses. Both methods give the same Coast FIRE Number.
Many Coast FIRE planners add a 10–15% buffer to their Coast FIRE Number specifically for inflation uncertainty. If your calculated Coast FIRE Number is $131,000 at 7% returns, aim for $150,000 before truly "coasting." This buffer also provides protection against sequence of returns risk in the early accumulation phase.
India presents a particularly compelling case for Coast FIRE. Historical Nifty 50 returns have averaged 12–15% nominally (though higher inflation must be considered). A 30-year-old Indian investor targeting retirement at 60 with ₹50 lakh/year expenses (FIRE Number: ₹12.5 crore) at 12% nominal returns needs a Coast FIRE Number of only ₹1.5 crore. Achievable through NPS, ELSS mutual funds, Nifty 50 index funds, and PPF. The Indian FIRE community (r/FIREIndia) is rapidly growing with this awareness.
UK investors face somewhat lower historical equity returns than the US (approximately 5–7% real). FIRE planning in the UK uses ISAs (£20,000/year tax-free) and SIPPs (workplace pension). A 30-year-old UK investor needing £30,000/year in retirement (FIRE Number: £750,000) at 6% real returns and retiring at 67 needs a Coast FIRE Number of approximately £176,000 — achievable within 8–10 years of consistent S&S ISA contributions.
Canada's TFSA (Tax-Free Savings Account) is arguably the most powerful retirement vehicle in the world for Coast FIRE purposes — completely tax-free growth AND tax-free withdrawals, with no restrictions on withdrawal age or purpose. Combined with RRSP (tax deduction on contributions), Canadian Coast FIRE seekers have excellent tax-advantaged tools. Use the currency selector at the top of this page to switch to CAD for Canadian-denominated calculations.
Australia's superannuation system mandates employer contributions (currently 11% of salary), providing a built-in Coast FIRE foundation for many workers. The key challenge is the preservation age (currently 60) for accessing super — meaning Coast FIRE achievers who retire before 60 need sufficient outside-super investments to bridge the gap. Many Australian FIRE seekers build both an ETF portfolio (accessible anytime) and maximize super contributions (for the tax advantages).
Coast FIRE is the right target if you value flexibility over speed. If full FIRE feels impossibly distant or requires sacrifices you're not willing to make, Coast FIRE offers a much closer milestone that still delivers profound freedom. Instead of needing 25× your annual expenses, you might only need 10–15× (depending on your age and return assumptions) to secure your retirement permanently.
The best way to find your number: use the Coast FIRE calculator at the top of this page. Enter your details, click Calculate, and see your exact Coast FIRE Number, how far you are from hitting it, and what your portfolio will look like at retirement. Then build a plan to close the gap — and enjoy the freedom that comes when retirement is no longer something you're racing toward, but something you've already secured.