Find out if your current investments can grow enough to fund your retirement without future contributions. Enter your details below to estimate your Coast FIRE number, test different scenarios, and see how close you are to financial independence.
Coast FIRE is a financial independence strategy where you save and invest enough early in life so your existing investments can grow to your retirement goal without requiring additional contributions.
Unlike traditional retirement planning, Coast FIRE focuses on reaching a point where time becomes your biggest advantage. Instead of investing aggressively for decades, you allow compound growth to do most of the work.
For example, imagine you have already invested enough by age 35. If your investments grow at a reasonable long term rate, they may reach your retirement target by age 65 without adding another dollar. You can still work, but you have more flexibility over how much you earn, the career you choose, or the hours you work.
This approach is popular within the Financial Independence, Retire Early, or FIRE, movement because it offers greater freedom long before retirement.
This strategy is not only for high income earners. It can work for anyone who starts investing early and stays consistent.
It may be a good fit if you:
If you are just beginning your investing journey, Coast FIRE can also serve as a long term milestone. Knowing your target helps you build a realistic financial plan.
Your result is more than a single number. It shows whether your current investments are on track to grow into the retirement portfolio you need.
After you run the calculator, you may see one of these outcomes.
If your current investments are enough to reach your retirement goal through future growth alone, you have reached Coast FIRE.
This does not mean you should stop working. It means you have the freedom to make different choices. You may decide to reduce your work hours, switch careers, start a business, or focus on goals outside of saving for retirement.
Many people still choose to invest after reaching this milestone. Doing so can create a larger retirement portfolio and provide a greater margin of safety.
If you have not reached your target yet, do not get discouraged. The calculator shows how close you are and what changes could improve your outcome.
You may reach your goal sooner by:
Even small changes can have a meaningful impact over several decades.
| Coast FIRE | Traditional FIRE | Barista FIRE | Lean FIRE | |
|---|---|---|---|---|
| Main goal | Let investments grow to fund retirement | Save enough to stop working | Leave full time work and work part time | Retire with minimal spending |
| Still working | Yes, usually | No, after reaching FIRE | Yes, part time | No, after reaching FIRE |
| Retirement savings | Mostly complete | Fully funded | Partially funded | Fully funded |
| Retirement lifestyle | Flexible | Based on planned spending | Flexible with work income | Minimal spending |
| Best for | People seeking career freedom | People seeking full early retirement | People wanting less work | People comfortable with lower spending |
The calculator estimates whether your current investments can grow to support your future retirement spending.
It uses several important factors to project your future portfolio value.
Select Single if you are planning for yourself or Couple if you are planning with a partner. This helps match the calculation to your household.
Enter your age today. The calculator uses this to determine how many years your investments have to grow.
Enter the age when you plan to retire. A longer investment period gives your portfolio more time to grow.
Enter how much you expect to spend each year in retirement, using today’s dollars. Include your expected living costs and other regular retirement expenses.
Enter the money you already have invested for retirement. Include investments such as a 401(k), Roth IRA, IRA, ETFs, or brokerage accounts. Exclude your home and emergency fund.
Enter how much you currently add to your investments each month. You can set this to $0 to see whether your existing portfolio could already support your future retirement goal.
Enter the annual growth rate you expect from your investments. Use a realistic long term estimate rather than an unusually high return.
Enter your expected annual inflation rate. This accounts for the rising cost of living and helps keep your retirement estimate in today’s purchasing power.
Enter the percentage of your portfolio you expect to withdraw each year during retirement. 4% is a common starting point, but your ideal rate may vary based on your retirement plan.
Run the calculation to see your Coast FIRE Number, Coast FIRE Age, Years Away, FIRE Number, projected portfolio at retirement, and estimated retirement income.
If you have not reached Coast FIRE, the calculator also shows how much more you may need to invest. Try changing your monthly contribution, retirement age, or other assumptions to compare different scenarios.
The calculator uses two simple formulas to estimate your Coast FIRE number.
Step 1: Calculate Your FIRE Number
FIRE Number= Annual Retirement Spending / Safe Withdrawal Rate
Step 2: Calculate Your Coast FIRE Number
Coast FIRE Number= FIRE Number / (1+r)n
Where:
This is the standard mathematical notation used by most FIRE calculators and financial planning resources. It’s clean, accurate, and easy to understand.
The calculator estimates how much your current investments could grow before retirement. It combines your investment timeline with assumptions about future growth, inflation, and retirement spending.
Several key factors influence the result.
Compound interest allows your investments to earn returns on both the original balance and previous earnings. Over many years, this creates much of the portfolio’s growth.
Time is often more valuable than trying to earn unusually high returns. Starting early usually has a greater impact than investing larger amounts later in life.
Your expected return reflects how much your portfolio may grow each year.
No one can predict future market performance. For that reason, many investors use conservative long term estimates instead of assuming exceptional returns.
Choosing realistic assumptions creates more dependable retirement projections.
Inflation affects nearly every retirement plan. The cost of housing, healthcare, food, and daily expenses often rises over time. A retirement goal that seems comfortable today may not provide the same purchasing power decades from now.
Including inflation produces a more realistic estimate of the savings needed for retirement.
The calculator depends on the values you enter. Unrealistic assumptions can produce misleading results.
Consider these guidelines when planning.
Many retirement plans use a 4% withdrawal rate as a starting point. This guideline comes from the Trinity Study, which examined how different withdrawal rates performed over long retirement periods.
It is not a guarantee. Your ideal withdrawal rate depends on your spending needs, investment strategy, taxes, and retirement length.
Management fees may seem small, but they can reduce long term portfolio growth. Review the expense ratios of your mutual funds, index funds, or ETFs. Lower costs allow more of your investment returns to remain invested.
Investment markets rarely grow at the same rate every year. Some years deliver strong gains. Others bring losses. The calculator estimates average long term growth, not yearly performance. Market swings are a normal part of investing and should not drive short term decisions.
A Coast FIRE Calculator provides an estimate based on the information you enter. It cannot predict future investment returns or personal circumstances.
Use it as a planning tool rather than a promise. Review your numbers whenever your income, expenses, retirement goals, or investment portfolio changes.
Financial planning works best when updated regularly instead of relying on one calculation for many years.
The 4% rule suggests that retirees may be able to withdraw about 4% of their investment portfolio during the first year of retirement and adjust future withdrawals for inflation.
It became widely known after the Trinity Study analyzed historical market data across different stock and bond portfolios.
Many FIRE plans use this rule as a planning benchmark because it provides a practical starting point. However, spending habits, taxes, healthcare costs, market conditions, and retirement length all influence how well it fits your situation.
Rather than treating it as a fixed rule, use it to test different retirement scenarios and build a plan that matches your personal goals.
References
Looking at real scenarios makes the numbers easier to understand. The examples below show how different choices can affect your path to financial independence.
Sarah is 30 years old and has invested $180,000. She plans to retire at 60 and expects moderate long term investment growth.
After running the calculator, she learns her current portfolio could grow enough to support her retirement without adding more money. She still decides to invest because it gives her a larger financial cushion.
James is 42 years old with $250,000 invested. His results show he is not yet Coast FIRE, but increasing his monthly investment and delaying retirement by three years puts him back on track.
These examples show that small adjustments can make a meaningful difference over time.
Once you cross the coast fire threshold, money stops being the reason you stay in a job you have outgrown. Career flexibility becomes immediate and real. You can cut hours, change roles, or take time between jobs without touching your retirement timeline.
Coast FIRE is also more sustainable than traditional FIRE. You save hard for a defined period, then live normally. Balance over sacrifice.
Sequence of returns risk does not disappear after you hit your number. Annual portfolio reviews and a cash buffer are non-negotiable. Healthcare before Medicare is routinely underestimated. Budget for it from day one. And discipline in Phase 1 is genuinely required. The only thing that truly breaks coast fire is waiting too long to start.
Coast FIRE means your existing investments can grow enough to fund your future retirement. Barista FIRE means you have enough saved to leave full time work and use part time income for current expenses. Coast FIRE focuses on stopping retirement contributions, while Barista FIRE focuses on reducing work.
The main risks include lower investment returns, higher inflation, rising healthcare costs, and unexpected expenses. Your results also depend on the assumptions you use. Review your plan regularly and use conservative estimates to reduce the risk of falling short.
Yes, if you expect to receive Social Security in retirement. Use a realistic benefit estimate rather than the maximum possible amount. For a more conservative plan, calculate your Coast FIRE number without Social Security and treat future benefits as additional income.
Yes. Starting later may require higher savings, lower retirement spending, or a later retirement age. The key is to understand your numbers and adjust your plan. Even with less time for compound growth, consistent investing can still move you toward financial independence.
Coast FIRE is about creating options, not following a perfect formula. This calculator helps you estimate whether your current investments can grow into the retirement portfolio you want. It also shows how changes to your savings, retirement age, investment returns, and spending can affect your future.
Use the results as a planning guide rather than a guarantee. Update your calculations as your income, goals, and investments change. The sooner you understand your Coast FIRE number, the sooner you can make informed financial decisions with greater confidence.
References
Disclaimer: Our Coast FIRE Calculator is a free tool to help you estimate your retirement savings goal. Results are based on the numbers you enter and are for informational purposes only. This is not financial advice. Please consult a qualified financial professional before making any retirement decisions.
