Coast FIRE Calculator

Calculate when you can stop contributing and let your investments grow to reach financial independence by retirement. Discover your Coast FIRE point and plan your path to freedom.

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Coast FIRE Age ? The age at which you'll reach Coast FIRE and can stop contributing —
Years to Coast ? How many years until you reach Coast FIRE —
Full FIRE Age ? The age at which you'll reach full FIRE (the complete FIRE number, not just Coast FIRE) —
FIRE Number ? Portfolio value needed to retire safely (Annual Expenses ÷ SWR) —
Real Growth Rate ? Expected portfolio growth after accounting for inflation — After inflation & fees
Portfolio at Retirement ? Projected portfolio value at retirement age if you stop contributions at Coast —
Monthly to Coast in N Years ? Monthly contribution needed to reach Coast FIRE by your retirement age —

Progress Towards Your Goal

Current
$0
Full FIRE
$0
Coast FIRE
$0
Advanced Metrics
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Sequence Risk Pre-Coast ? Sensitivity to early market returns before reaching Coast FIRE

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Total Savings to Coast ? Sum of all contributions needed until reaching Coast FIRE

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Coast Buffer ? How close your current portfolio is to the Coast FIRE target

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Return Sensitivity ? How Coast Age changes with ±1% return variation

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SWR Stress Test ? FIRE income range with SWR ±0.5% bands

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Age / Year Portfolio Coast Target Gap Status
Run calculation to see milestones

What Is Coast FIRE / Coast FI?

What is Coast FIRE (Financial Independence Retire Early) or Coast FI (Financial Independence) and why does it matter for your financial freedom journey?

Coast FIRE and Coast FI mean the same thing: a variation of the FIRE movement that focuses on reaching financial independence without retiring early.

Coast FIRE / FI is one of the most important milestones for anyone pursuing financial independence. It shows the exact point where your current investments are enough to grow—without new savings or contributions—into your future FIRE number by retirement age.

Once you reach Coast FIRE, you can:

  • Lower your savings rate
  • Choose part-time or flexible work, since you no longer need to invest heavily
  • Focus on enjoying life now while your portfolio compounds quietly in the background

To dive deeper into the concept, read our detailed guides and discover how soon you can stop saving for retirement and still retire financially free.

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What Is Coast FIRE – The Easiest Path to Financial Freedom

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Semi Retirement Calculator: Coast, Flamingo & Barista FIRE

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How To Calculate Coast FI + Free Coast FIRE Calculator

Understanding Your Coast FIRE Number

Your Coast FIRE number represents the amount you need invested today for your portfolio to grow into your FIRE number (see down below) by your planned retirement age. The formula:

\( \text{Coast FIRE Number} = \frac{\text{Annual Expenses in Retirement}}{\text{SWR}} \times (1 + r)^{-t} \)
\( \text{Annual Expenses in Retirement} \): Expected yearly costs during retirement
\( \text{SWR} \): Safe Withdrawal Rate
\( r \): Expected annual rate of return
\( t \): Years until retirement

Example:

  • Annual expenses: €40,000
  • SWR: 4%
  • Rate of return: 7%
  • Current age: 30
  • Retirement age: 55

➡️ Your Coast FIRE number = 184,249.
If you have this amount invested today, you can “coast” toward FIRE — no further investing required!

👉 Run your numbers now and find out how close you are to Coast FIRE with the calculator above.

Accounting for Inflation: Real vs. Nominal Returns

When you plan for FIRE, you need to think about inflation — the fact that prices go up over time. Nominal returns show how much your money grows in total over time. Real returns show what your money is actually worth after those rising prices.The formula (for real returns):

\( \text{Real Return} = \frac{1 + \text{Nominal Return}}{1 + \text{Inflation Rate}} - 1 \)
\( \text{Nominal Return} \): Expected annual growth rate of the portfolio
\( \text{Inflation Rate} \): Average yearly inflation rate

Example:

  • Nominal return: 7%
  • Inflation rate: 3%

➡️ Real return ≈ 3.88%

By using real returns, your projections reflect future purchasing power — making your Coast FIRE and FIRE numbers more accurate.

Your FIRE Number

Your FIRE number is the total amount you need saved so your investments can cover your expenses indefinitely. That depends on how much money you withdraw from your portfolio under all.

Example:
If your annual expenses are 30,000 and you plan to use the 4% safe withdrawal rate annually, you’ll need:
30,000 × 25 = 750,000.

With this amount, you can safely withdraw 30,000 per year for roughly 30 years — with a very high probability of never running out of money.

To dive deeper, use our Retirement Withdrawal Strategy Calculator to test proven withdrawal methods and find the strategy that fits your retirement goals.

Coast FIRE vs. Barista FIRE vs. Flamingo FIRE

Coast FIRE, Barista FIRE, and Flamingo FIRE all help you reach financial independence in different ways — each focusing on semi-retirement rather than early retirement.

While Coast FIRE and Flamingo FIRE let your investments grow on autopilot — allowing you to stop saving for retirement and work less — Barista FIRE combines part-time work with gradually withdrawing money to cover expenses.

With Flamingo FIRE, you typically save around 50% of your FIRE number, then let compounding growth carry you to full FIRE faster. In contrast, Barista FI requires building a large portion of your FIRE number before scaling back, but it doesn’t follow a fixed percentage target.

Coast FIRE Pitfalls

The biggest risk with Coast FIRE is that the stock market doesn’t always perform as expected. When investment returns fall short of your assumptions for an extended period, your plan can quickly lose momentum.

Another major risk is high inflation, which erodes your purchasing power over time. In that case, you may need to adjust your savings and start contributing again to your portfolio to ensure your investments remain sufficient to grow into your full FIRE number.

FAQs: Coast FIRE Calculator

Here are the most common questions and simple answers to help you use the Coast FIRE calculator effectively.

How does the calculator compute my Coast FIRE number?

It first calculates your FIRE number (annual expenses ÷ SWR), then discounts that future amount back to today using your real growth rate (return minus inflation).

Does the calculator use real (inflation-adjusted) or nominal returns?

It converts your nominal return and inflation into a real growth rate, so your results reflect future purchasing power.

Do I enter expenses in today’s or future money?

Enter today’s annual expenses — the calculator adjusts for inflation automatically.

What do the chart lines mean?

Blue: Coast FIRE Number — how much you must have at each age.
Red: FIRE Number — your end goal.
Green: Portfolio — your projected growth path.

When do monthly contributions stop?

Once you reach your Coast FIRE point. From there, your portfolio grows through compound interest alone.

Which Safe Withdrawal Rate (SWR) Should I Use?

A 4% withdrawal rate is common starting point for retirement periods of about 30 years. For more conservative planning or longer retirement horizons, consider using 3–3.5% to add an extra margin of safety.

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