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Updated April 2026 · 4% Rule · CFP-Aligned

Coast FIRE Calculator

Find your Coast FIRE number instantly — how much to save today so your investments grow to full retirement without any more contributions. Save aggressively now. Coast freely later.

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Coast FIRE Calculator
Enter your details to find your personalized Coast FIRE number
Results in 30 sec
Your financial profile
yrs
yrs
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Uses the 4% Safe Withdrawal Rule (Trinity Study) — your FIRE number = 25× annual expenses. Real return = investment return minus inflation. All in today's dollars.

Your Coast FIRE Number
$0
Save this much today — your investments will grow to $0 by age 65
FIRE Number (25×)
$0
Full retirement target
Additional Needed
$0
To reach Coast FIRE
Years to Retire
0
Until full retirement
Real Return Rate
0%
After inflation
🔥
Calculating...
Your Coast FIRE status will appear here.
Progress to Coast FIRE
0%
Saved: $0Coast FIRE: $0
🌱Starter$10K
🚀25% Coast—
🎯50% Coast—
🏆Coast FIRE!—
Portfolio Growth to Retirement
Save Your Coast FIRE Report
$1M+
Typical FIRE number for $40K/yr spenders (25× rule)
10%
S&P 500 average annual return since 1926
35 yrs
Power of compounding — saves you decades of contributions
4%
Safe withdrawal rate — the foundation of every FIRE calculation

About This Coast FIRE Calculator

Built for Americans pursuing financial independence — from FIRE beginners to seasoned investors. Here's what makes this the most transparent free Coast FIRE calculator available.

About the Coast FIRE Calculator

The EmergencyFundCalculator.com Coast FIRE Calculator uses the mathematically precise 4% safe withdrawal rule (Trinity Study) and a real return rate approach to determine exactly how much you need invested today to coast to full retirement — without making a single additional contribution.

Unlike simple Coast FIRE calculators that give everyone the same number, this tool uses your exact age, retirement timeline, annual expenses, investment return assumption, and inflation rate to produce a personalized, accurate result with a full growth chart and milestone tracker.

Precise 4% Rule Math
Uses the Trinity Study's 4% safe withdrawal rate. FIRE Number = 25× annual expenses. Coast FIRE = FIRE ÷ (1 + real return)^years.
Portfolio Growth Chart
Visual growth timeline showing your current savings compounding to your full FIRE number over decades — without additional contributions.
Milestone Tracker
Four progress checkpoints: $10K Starter, 25% Coast, 50% Coast, and Full Coast FIRE — so you can celebrate progress along the way.
100% Private
All calculations run in your browser. No data is sent to any server, stored, or shared. Zero data collection.
Adjustable Assumptions
Change return rate, inflation, and retirement age to model different scenarios and find your personal optimal path.
Mobile-First Design
Fully optimized from 320px phone to 4K monitor. Touch-friendly inputs. Instant results on every device.

What Is Coast FIRE?

Coast FIRE is a financial independence milestone that gives you freedom decades before traditional retirement — without needing your full FIRE number first. Here's the complete explanation.

Coast FIRE: The Complete Definition

Coast FIRE is a financial independence strategy where you save aggressively early in your career to reach a specific investment balance — your Coast FIRE number. Once you hit it, you can stop making retirement contributions entirely. Your existing investments will grow on their own through compound interest to fund your full retirement by your target age.

The key insight: thanks to exponential compound growth, a dollar invested at age 25 becomes dramatically more powerful than a dollar invested at age 45. Coast FIRE harnesses this by front-loading savings when compound growth has the most time to work.

$183K
Typical Coast FIRE number for a 30-year-old targeting $40K/yr in retirement at 65
35 yrs
Years for that $183K to grow to $1M+ at 7% nominal return without additional contributions
$1M+
FIRE number for $40K/yr retirement (25× rule) — what Coast FIRE gets you to automatically
~18%
The Coast FIRE number is typically just 15–20% of the full FIRE number for young savers
Decades
Earlier financial flexibility vs. traditional retirement savings approach
Any job
After reaching Coast FIRE, you only need income to cover living expenses — not retirement savings

Coast FIRE vs. Regular FIRE vs. Lean FIRE

StrategyWhat It RequiresWhen You Stop SavingBest For
Regular FIREFull FIRE number (25× expenses)After reaching full retirement portfolioThose who want to fully stop working ASAP
Coast FIRE ⭐Enough to compound to FIRE by retirementOnce Coast number is hit — then just cover expensesThose who want flexibility decades earlier
Lean FIRE25× lean/minimal annual expensesAfter reaching frugal FIRE numberExtreme frugality — very low cost of living
Fat FIRE25× higher lifestyle annual expensesAfter reaching large portfolio (often $3M+)Those who want to retire with full lifestyle intact

What Changes After Coast FIRE

Before Coast FIRE
  • Must save aggressively every month
  • High-income job feels mandatory
  • Career decisions driven by salary
  • Can't afford career risks or breaks
  • Every extra dollar must go to investments
After Coast FIRE
  • Retirement savings are fully on autopilot
  • Just need to cover current living expenses
  • Can take lower-stress or passion jobs
  • Freedom to take career risks or sabbaticals
  • Spend on what brings you joy today

The Coast FIRE insight: You don't need to retire early to benefit from Coast FIRE. You just need enough invested that the retirement problem is solved — leaving you free to work differently, not necessarily stop working.

How the Coast FIRE Number Is Calculated

Transparent, step-by-step math behind every number this calculator produces — no black boxes.

The Complete Coast FIRE Formula

The calculation uses two established financial formulas: the 4% rule for your FIRE number, and present value discounting for your Coast FIRE number.

Step 1: Calculate Your FIRE Number

FIRE Number  =  Annual Expenses × 25
             (the 4% Safe Withdrawal Rule from the Trinity Study)

Example: $50,000/yr expenses × 25 = $1,250,000 FIRE Number

Step 2: Calculate Your Real Return Rate

Real Return  =  (1 + Nominal Return) ÷ (1 + Inflation Rate) − 1

Example: (1 + 0.07) ÷ (1 + 0.025) − 1 = 4.39% real return

Step 3: Discount Back to Today

Coast FIRE  =  FIRE Number ÷ (1 + Real Return)^Years to Retire

Example: $1,250,000 ÷ (1.0439)^35 years
        = $1,250,000 ÷ 4.56
        = ~$274,000 Coast FIRE Number

This means: if you invest $274,000 today in a diversified portfolio earning 7%/year (4.39% real), it will grow to $1,250,000+ by your retirement age — completely covering your $50,000/year retirement lifestyle via the 4% rule — without a single additional contribution.

Why use real return instead of nominal? Using the real return ensures your FIRE number (which is in today's dollars) and your Coast FIRE number are both expressed in the same purchasing power. This avoids the common mistake of using nominal returns on inflation-adjusted expense estimates.

Why the 4% Rule (25× Rule)?

The 4% rule comes from the Trinity Study (Cooley, Hubbard, Walz, 1998), which analyzed historical US market data going back to 1925. The study found that a 4% initial withdrawal rate, adjusted for inflation annually, had a 95%+ success rate over 30-year retirement periods — even during market crashes, recessions, and high-inflation periods.

  • 95%+ success rate over all historical 30-year periods in the US market — including the Great Depression, 1970s stagflation, and dot-com crash.
  • Endorsed by CFP Board and used as a standard starting point by certified financial planners for retirement income planning.
  • Conservative adjustment: For retirements longer than 30 years (early retirees), some planners recommend a 3.5% rule (28.6× expenses). Adjust accordingly in the calculator.
  • Assumes a balanced portfolio — typically 50–75% US stocks, remainder in bonds. A 100% stock portfolio has historically allowed even higher withdrawal rates.

How to Use the Coast FIRE Calculator

A complete step-by-step guide to getting the most accurate, actionable result — and understanding what to do with it.

Step-by-Step Guide

Step 1
Enter Your Current Age & Target Retirement Age

Your current age determines how many years compound growth has to work. Your retirement age sets the endpoint. The longer the runway, the smaller your Coast FIRE number — this is the most powerful lever in the calculation.

Pro Tips
  • Try moving your retirement age from 65 to 60 — your Coast FIRE number jumps significantly because you have 5 fewer years of compound growth.
  • Age 25 vs age 35 is a massive difference — a 25-year-old's Coast FIRE number is roughly half that of a 35-year-old targeting the same goal.
Step 2
Enter Your Current Retirement Savings

Include all investment accounts: 401(k), Traditional IRA, Roth IRA, SEP-IRA, brokerage accounts, HSA investments. Do not include your emergency fund or savings you plan to spend soon — only long-term investment balances that will remain invested until retirement.

Step 3
Enter Your Annual Retirement Expenses

How much do you expect to spend per year in retirement, in today's dollars? The calculator adjusts for inflation automatically. Be realistic — most retirees spend 70–80% of their pre-retirement income.

US Expense Benchmarks
  • Lean: $30,000–$40,000/year — frugal, low cost-of-living area or paid-off home.
  • Average: $40,000–$60,000/year — median US household retirement spending, modest lifestyle.
  • Comfortable: $60,000–$100,000/year — includes travel, dining, hobbies, quality healthcare.
  • Fat FIRE: $100,000+/year — premium lifestyle, private healthcare, frequent travel.
Step 4
Set Investment Return & Inflation Rates

The defaults — 7% return and 2.5% inflation — are standard US financial planning assumptions. 7% is slightly below the S&P 500's historical 10% average, providing a conservative buffer. 2.5% is the Fed's approximate long-run inflation target.

Return Rate Guidelines
  • 7% (conservative): Good default for a balanced 60/40 stock/bond portfolio or if you want extra safety margin.
  • 8–9% (moderate): Appropriate for a more stock-heavy allocation (80%+ equities), especially over long timelines.
  • 10% (historical average): The S&P 500's actual historical average — but may be optimistic for future projections.
Step 5
Read Your Results & Take Action

Your Coast FIRE number appears at the top. Here is what each result means:

  • Coast FIRE Number: The amount you need invested today. Once you hit this, you can stop contributing to retirement — just cover living expenses with any income.
  • FIRE Number (25×): Your full retirement portfolio target. This is what your Coast investment will grow to by retirement age.
  • Additional Needed: The gap between your current savings and your Coast FIRE number. This is your immediate savings target.
  • Progress bar: How close you are to Coast FIRE. Even 25% of the way is a massive milestone — that money is already compounding powerfully.
  • Growth chart: Shows your current portfolio growing to your full FIRE number over time, with no additional contributions needed.

Real Coast FIRE Scenarios — US Examples

Three real-world American financial scenarios showing how Coast FIRE transforms financial freedom timelines.

Coast FIRE in Practice

Scenario 1 Emily, 27 — Nurse in Nashville, $62K salary. Retirement target: $45K/yr at 65.
Traditional Approach

Saves 10% ($6,200/yr) for 38 years. Feels trapped in nursing due to student loans and forced savings pressure. Never reaches Coast FIRE. Retires at 65 with $1.1M — barely enough. No flexibility for 38 years.

Coast FIRE Approach

Saves aggressively for 8 years ($15K/yr) — hits Coast FIRE of ~$159K at age 35. Switches to part-time nursing + travel nursing. No more retirement contributions needed. Portfolio grows to $1.125M by 65. Lived life her way for 30 years.

Scenario 2 Marcus, 32 — Marketing manager in Denver, $78K. Target: $60K/yr at 62.
Traditional Approach

Saves 15% ($11,700/yr) consistently. Still feels financially constrained — can't afford to change careers, start a business, or travel. Works until 62 out of necessity. Final portfolio: $1.5M. No financial flexibility for 30 years.

Coast FIRE Approach

Already has $85,000 saved. Coast FIRE number: ~$304,000. Aggressively saves for 7 more years — hits Coast FIRE at 39. Takes lower-stress product marketing role, starts a side business. Portfolio reaches $1.5M at 62 automatically. 23 years of career freedom.

Scenario 3 Sofia & James, 29 & 31 — Dual income, San Diego, $140K combined. Target: $80K/yr at 60.
Traditional Approach

Both in high-pressure corporate jobs, saving $28K/yr. Both feel locked in. Can't start a family without financial anxiety. Work stressful jobs for 31 years until 60. Final portfolio: $2M. Missed key life years due to career pressure.

Coast FIRE Approach

Combined savings: $120K. Coast FIRE: ~$475K. Max both 401(k)s aggressively — hit Coast FIRE at 35. Sofia becomes part-time consultant; James starts a small business. Portfolio grows to $2M+ at 60. 25 years of career and family flexibility.

How to Reach Your Coast FIRE Number Faster

Evidence-based strategies to accelerate your path to Coast FIRE — ranked by impact.

High-Impact Acceleration Strategies

  1. 1
    Max your 401(k) employer match first — This is an instant 50–100% return. If your employer matches 4% of salary, contribute at least 4%. No investment beats free money.
  2. 2
    Max your Roth IRA ($7,000 in 2026) — Tax-free compound growth for decades. A Roth IRA maxed at 25 is worth dramatically more than one maxed at 40.
  3. 3
    Increase your savings rate aggressively for 5–10 years — The goal is to hit Coast FIRE as early as possible, then relax. A 35–45% savings rate for a decade beats 15% for 40 years.
  4. 4
    Invest tax refunds and bonuses directly — The average US tax refund is $3,000+. Invest 100% of it toward your Coast FIRE target. One good bonus year can accelerate your timeline by 2–3 years.
  5. 5
    Use a Health Savings Account (HSA) as a stealth IRA — Triple tax advantage: pre-tax contributions, tax-free growth, tax-free medical withdrawals. After 65, functions like a Traditional IRA for any use.
  6. 6
    Invest in low-cost index funds — A 0.05% expense ratio (Vanguard/Fidelity index funds) vs. 1% managed fund saves you hundreds of thousands over a 30-year Coast FIRE horizon.
  7. 7
    Increase your income strategically — The fastest path to Coast FIRE is earning more. A $10K salary increase redirected entirely to investments can accelerate Coast FIRE by 3–5 years.

The Coast FIRE paradox: The harder you save early, the less you have to save for the rest of your life. A decade of aggressive saving in your 20s–30s buys you decades of financial flexibility. Every dollar invested at 25 is worth roughly 10× more than the same dollar invested at 55.

What to Do After Reaching Coast FIRE

Hitting Coast FIRE is a major milestone — but it's not the end. Here's the complete playbook for what comes next.

The Post-Coast FIRE Playbook

  • Stop mandatory retirement contributions — You no longer need to direct income toward long-term retirement savings. Your existing portfolio handles it automatically through compounding.
  • Cover living expenses with any income — You just need enough income to pay rent, food, healthcare, and lifestyle costs. This can come from any job — no longer requires high income.
  • Keep your investments untouched — Do not withdraw from retirement accounts. Let them compound undisturbed. This is the entire mechanism of Coast FIRE.
  • Pursue work you actually want to do — Lower-stress job, part-time work, self-employment, creative work, nonprofit, passion projects. The income just needs to cover the bills.
  • Build a budget for your post-Coast life — Use our Budget Planner to ensure your reduced income covers all current living expenses with some buffer.
  • Maintain your emergency fund — Keep 3–6 months of expenses in a HYSA earning 4–5% APY. If you lose income unexpectedly, do not touch investments. Use our Emergency Fund Calculator for your exact target.
  • Recalculate every 3–5 years — If your expected retirement expenses change (new house, health costs, lifestyle), recalculate to confirm your Coast FIRE number still covers the updated FIRE number.

Optional but powerful: If you continue working and earning above your living expenses after hitting Coast FIRE, any extra savings will overshoot your FIRE number — giving you the option to retire earlier than originally planned. Coast FIRE is a floor, not a ceiling.

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Before investing for Coast FIRE, ensure you have a fully funded emergency fund. Use our free Emergency Fund Calculator to find your exact 3–6 month savings target in 60 seconds.

Coast FIRE FAQ — Frequently Asked Questions

Every common question about Coast FIRE — answered clearly and concisely for US investors.

Frequently Asked Questions

What is Coast FIRE and how is it different from regular FIRE?

Regular FIRE requires accumulating your full FIRE number (25× annual expenses) before you can stop working. Coast FIRE only requires saving enough that compound growth gets you there by your target retirement age — without any additional contributions. The key difference: with Coast FIRE, you achieve financial flexibility decades earlier, because you only need income to cover today's expenses — not to build a retirement nest egg.

How is the Coast FIRE number calculated?

Step 1: Calculate FIRE Number = Annual Expenses × 25 (the 4% rule). Step 2: Real Return = (1 + Nominal Return) ÷ (1 + Inflation) − 1. Step 3: Coast FIRE = FIRE Number ÷ (1 + Real Return)^Years to Retirement. Example: $1M FIRE number ÷ (1.0439)^35 = ~$218,000 Coast FIRE number at age 30 targeting retirement at 65 with 7% return and 2.5% inflation.

What is the 4% rule and is it still valid in 2026?

The 4% rule comes from the 1998 Trinity Study, which analyzed US market data from 1926 onward. It found that withdrawing 4% of your portfolio in year one of retirement, then adjusting for inflation annually, had a 95%+ success rate over 30-year periods — even during crashes. In 2026, most CFPs still use it as a standard starting point, though some recommend 3.5% for very early retirees (50+ year retirement horizons) and 4.5–5% for those with shorter timelines or who are more flexible on spending.

Should I include Social Security in my FIRE number?

Yes — Social Security can significantly reduce your FIRE number. If you expect $18,000/year in Social Security at 67, subtract that from your annual retirement expenses before multiplying by 25. A $50,000/yr lifestyle with $18K in Social Security means you only need a $32,000 × 25 = $800,000 portfolio instead of $1.25M. Use the SSA's MySSA tool to estimate your projected benefit.

What investment return rate should I use?

The S&P 500 has historically returned ~10% annually since 1926, but past performance doesn't guarantee future returns. Most financial planners recommend using 7% for a conservative projection (slightly below historical average, providing a safety buffer). If you're heavily invested in bonds or international stocks, 5–6% may be more appropriate. Use 8–9% only if you're comfortable with a more aggressive assumption and have a long timeline.

Does reaching Coast FIRE mean I can quit my job?

No — Coast FIRE means your retirement savings are handled automatically. You still need income to cover your current living expenses (rent, food, healthcare, etc.) until you actually retire. The freedom is in how you earn that income — it no longer has to be a high-paying, high-stress job. Many people at Coast FIRE switch to part-time work, passion projects, self-employment, or lower-stress careers. Full work optionality (no income needed) requires reaching your complete FIRE number.

Which accounts should I count toward my Coast FIRE number?

Count all long-term investment accounts you plan to leave untouched until retirement: 401(k), 403(b), Traditional IRA, Roth IRA, SEP-IRA, SIMPLE IRA, HSA (invested portion), and taxable brokerage accounts. Do NOT count: your emergency fund, checking account, savings for near-term goals (home down payment, car), or CDs/money market accounts earmarked for spending.

Is my financial data private? Does this calculator store anything?

Yes, completely private. All calculations run entirely in your browser using JavaScript. No data is transmitted to any server, stored in any database, or shared with any third party. Your financial numbers never leave your device. You can verify this in your browser's network inspector — zero outbound requests while using this calculator.

Methodology & Trusted Sources

Our sources, our mathematical approach, and how to reach us.

Methodology & Sources

This calculator is grounded in established financial research:

📚Trinity Study (1998)4% Safe Withdrawal RateCooley, Hubbard & Walz — the foundational research behind every FIRE calculation
📊S&P 500 Historical DataReturn Rate BenchmarksNYU Stern School of Business — US market returns from 1928 through 2025
🏛️CFPB GuidelinesRetirement Planning StandardsConsumer Financial Protection Bureau retirement income framework
🔄Updated April 2026Current BenchmarksInflation data, HYSA rates, and contribution limits reviewed quarterly
ChooseFI — Coast FI Complete Guide Early Retirement Now — Safe Withdrawal Rate Research Series Mad Fientist — FIRE Math & Strategy Bogleheads Wiki — Safe Withdrawal Rates

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