Enter your numbers below. Our free calculator shows your Coast FIRE number, interactive growth chart, and downloadable retirement roadmap. No sign-up needed.
Fill in your details — results update live
📍 Green dot = Coast FIRE point reached | Gold line = Required FIRE Target
Adjust sliders to explore different outcomes in real-time
How many years until you hit your Coast FIRE number?
How much can you safely withdraw monthly in retirement?
Get a personalized PDF with your Coast FIRE number, growth chart data, and retirement milestones. Unique feature — not available on other calculators!
Calculate your numbers first to generate your report.
Every input explained in plain English — no finance degree required
Set your Current Age using the slider (18–65). Then set your Target Retirement Age — the age you want to stop working full-time.
Enter the total value of all your invested accounts right now — 401(k), IRA, Roth IRA, brokerage accounts, index funds, etc.
How much money (in today's dollars) do you think you'll spend each year once you retire? This is your estimated annual lifestyle cost.
This is the average yearly return you expect from your investments. The default is 7%, which is the S&P 500's historical inflation-adjusted average.
This is the percentage of your retirement nest egg you'll withdraw each year without running out of money. The famous "4% Rule" (Trinity Study) is the default.
Inflation reduces the buying power of money over time. The default is 3%, which is close to the US historical average. This adjusts your future needs in real terms.
Once you hit Calculate, here's exactly what each number means:
The big green number — this is how much you need invested right now for your money to grow to your FIRE Target by retirement, without adding another dollar. This is your goal.
The total nest egg you need at retirement to live off investments forever. Based on your annual expenses divided by your withdrawal rate.
The number of years between today and your target retirement age. This is your compounding window — the longer this is, the lower your Coast FIRE number.
How much you can safely withdraw every month in retirement from your nest egg, without running out of money based on your chosen withdrawal rate.
Drag the Monthly Contribution slider to see how saving more each month accelerates your path to Coast FIRE. It shows the exact year and age when you'll hit your number — live, as you drag.
Best use: Try different monthly savings amounts ($200, $500, $1,000) to find a realistic goal that fits your budget.
Enter your planned monthly savings and instantly see how many years it will take to reach your Coast FIRE number from today. Pulls your current savings and return rate from the main calculator.
Best use: If you're not at Coast FIRE yet, use this to set a realistic savings timeline.
Enter any total portfolio amount and see your estimated monthly income in retirement. Auto-fills with your projected portfolio value at retirement. Great for "what if I save more?" planning.
Best use: Test different retirement portfolio sizes to see how they translate into monthly income.
Switch to "vs. FIRE Types" tab to compare your portfolio growth against Lean FIRE, Regular FIRE, and Fat FIRE targets simultaneously.
Financial freedom doesn't always mean having millions in your bank account today. Sometimes, it simply means knowing you never have to worry about saving for retirement ever again. This is what we call Coast FIRE.
If you live in the USA or are planning for your future there, this guide will explain step-by-step how you can calculate your Coast FIRE number and become "free" much sooner than you think.
Imagine you are riding a bicycle. In the beginning, you have to pedal very hard to get moving. But once the bike reaches a good speed and you hit a downhill slope, you can stop pedaling. The bike just keeps moving forward on its own.
Coast FIRE is exactly like that. It means you have saved and invested enough money early in your life so that you don't need to add another penny to your retirement fund. Your existing investments will grow on their own through the Magic of Compounding. By the time you turn 60 or 65, that money will have grown into a substantial fortune.
In short: You stop "pedaling" (saving for retirement) and just "coast" (work only to cover your current living expenses).
Our Coast FIRE retirement calculator uses standard compound interest math trusted by financial planners worldwide:
FIRE Target = Annual Expenses ÷ Withdrawal Rate
Example: $60,000/year ÷ 4% = $1,500,000 FIRE Target
Coast FIRE Number = FIRE Target ÷ (1 + Annual Return)^Years to Retirement
Example: $1,500,000 ÷ (1.07)^32 = ≈ $180,000 Coast FIRE Number
This means if you have $180,000 invested today at age 28, and you earn 7% annually, you'll have $1.5M by age 60 — without adding another dollar. That's your Coast FIRE moment!
In the US market, with rising costs and busy lifestyles, many people don't want to wait until they are 67 to feel secure. Searching for the best coast fire calculator has grown significantly as more Americans discover that financial freedom doesn't require full retirement — just smart, early investing.
There are multiple types of FIRE. Here's how they compare:
| Type | Annual Spending | FIRE Target (4% rule) | Still Working? | Best For |
|---|---|---|---|---|
| 🏖️ Coast FIRE | Any amount | Any target | Yes, just for living costs | Early savers wanting flexibility |
| 🌿 Lean FIRE | < $40,000/yr | ~$1,000,000 | No (fully retired) | Minimalists, frugal lifestyle |
| 🔥 Regular FIRE | $40K–$80K/yr | ~$1M–$2M | No (fully retired) | Average-income households |
| 💎 Fat FIRE | > $100,000/yr | > $2,500,000 | No (fully retired, luxuriously) | High earners, luxury lifestyle |
| ⚡ Barista FIRE | Partial needs covered | ~$500K–$800K | Yes, part-time | Those wanting a slower transition |
Coast FIRE works because of Compound Interest — often called the "8th Wonder of the World." Here's a real example:
This is precisely why our coast fire number calculator shows you the "magic number" you need right now — so time can do the heavy lifting.
The 4% rule comes from the famous Trinity Study. It states that if you withdraw 4% of your retirement portfolio annually, your money will last at least 30 years through most historical market conditions.
Annual Withdrawal = Total Savings × 4%
Monthly Income = (Total Savings × 4%) ÷ 12
$1,000,000 × 4% = $40,000/year = $3,333/month
For a coast fire calculator for couples, you have two options:
Many couples find that splitting the target means each partner needs a smaller Coast FIRE number — making it achievable much sooner.
If you are calculating your retirement roadmap with a partner, we have a specialized tool designed to handle joint incomes, shared household expenses, and dual retirement goals.
Go to the Coast FIRE Calculator for Couples →
Our dedicated couples' tool features custom scenarios for partners and personalized joint PDF reports to help you build your future together.
Everything you need to know about Coast FIRE
Coast FIRE means you've invested enough that compound interest will grow your savings to your retirement goal without any additional contributions. Regular FIRE means you've already accumulated enough to fully retire. With Coast FIRE, you still work — but only to cover today's expenses, not to save for the future.
Your Coast FIRE number = FIRE Target ÷ (1 + annual return)^years to retirement. First, determine your FIRE Target (annual retirement expenses ÷ withdrawal rate). Then discount it back to today using compound interest. Our free coast fire calculation tool does this instantly — just enter your age, savings, and goals above.
Yes! The secret is to start as early as possible. A 22-year-old needs to save far less than a 40-year-old to reach the same Coast FIRE goal, because they have 38+ years of compound growth ahead. Even starting late, you can accelerate your Coast FIRE timeline with higher monthly contributions using our Time-to-Coast calculator above.
Not exactly. Coast FIRE means you can stop saving for retirement — your investments will handle that automatically. You still need to earn enough to cover current living costs like rent, food, healthcare, and fun. The big win is you no longer need a high-stress, high-salary job. Many Coast FIRE achievers switch to part-time work, freelancing, or passion projects.
Most US financial planners use 7% as a conservative real return rate (nominal ~10% minus ~3% inflation) based on the S&P 500's historical average. If you invest in a diversified index fund like VTSAX or VOO, 7% is a reasonable baseline. For more conservative planning, use 5–6%. The slider in our calculator lets you test multiple scenarios instantly.
For couples, enter your combined household savings in "Current Invested Savings" and your combined annual retirement expenses. The tool will then calculate the total Coast FIRE number your household needs. Alternatively, run the calculation twice — once for each partner — to see each person's individual progress.
Investing always carries risk. That's why we default to 7% — below the historical average — to build a buffer. Smart planners also keep 1–2 years of living expenses in cash, diversify across asset classes, and use a slightly lower withdrawal rate (3.5% instead of 4%) for extra safety. The longer your runway, the more market volatility you can absorb.
No. CoastFIRECalculator.us uses 100% client-side JavaScript. All calculations happen in your browser. We do not collect, store, or transmit your financial inputs to any server. Your data stays private on your device.