Introduction
Coast FIRE is a milestone on the path to financial independence where you have saved enough money that, even if you stop contributing, your investments will grow on their own to reach your full retirement goal by the time you want to retire. Once you hit Coast FIRE, you no longer need to save aggressively. You can work less, switch to a lower-paying job you enjoy, or simply reduce financial stress — because compound growth does the heavy lifting from that point forward.
This Coast FIRE Calculator helps you figure out exactly when you can reach that point. Enter your current age, investment balance, expected growth rate, monthly or yearly contributions, and your retirement spending goals. The calculator will show you how many years until you reach Coast FIRE, the age you will reach it, and how much wealth you will have at that time. It also displays your full retirement goal so you can see the complete picture. A chart and year-by-year table break down your portfolio growth, contributions, and progress toward both your Coast FIRE number and your final retirement target.
How to Use Our Coast FIRE Calculator
Enter your current financial details and retirement goals below to find out when you can stop saving and let your investments grow on their own to reach your retirement target. The calculator will show your Coast FIRE age, the wealth you need at that point, and a full year-by-year breakdown of your portfolio growth.
Current Age — Enter how old you are right now. This is the starting point the calculator uses to figure out how many years you have until retirement.
Current Investment Assets — Enter the total dollar amount you currently have saved and invested. This includes money in retirement accounts, brokerage accounts, and other investments. If you're unsure of this figure, our Net Worth Calculator can help you get a clear picture of where you stand financially.
Investment Growth Rate — Enter the yearly rate of return you expect your investments to earn. A common estimate is 8%, which reflects the historical average of the stock market before adjusting for inflation. You can use the Rule of 72 Calculator to quickly estimate how long it will take your investments to double at a given growth rate.
Contribution — Enter how much money you add to your investments on a regular basis. Use the dropdown to choose whether this amount is monthly or yearly.
Adjust For Inflation (Contributions) — Choose whether your contributions should increase by 2% each year to keep up with inflation. Select "Yes" if you plan to raise your savings as your income grows. Our Inflation Calculator can help you understand how purchasing power changes over time.
Retirement Age — Enter the age at which you plan to fully retire and start living off your investments.
Retirement Annual Spending — Enter how much money you expect to spend each year during retirement. This helps the calculator figure out how large your portfolio needs to be.
Adjust For Inflation (Retirement Spending) — Choose whether your retirement spending goal should increase by 2% each year to account for rising costs over time. Select "Yes" for a more realistic estimate.
Annual Withdrawal Rate — Enter the percentage of your portfolio you plan to withdraw each year in retirement. The default is 4%, which is based on the well-known 4% rule used in retirement planning.
What Is Coast FIRE?
Coast FIRE is a milestone on the path to financial independence where you have saved enough money that, even if you never invest another dollar, your portfolio will grow on its own to reach your full retirement goal by the time you want to retire. The word "coast" means you can coast — you no longer need to actively save. You still might work to cover your daily living expenses, but the pressure to save aggressively goes away.
How Coast FIRE Works
The idea behind Coast FIRE is simple: compound interest does the heavy lifting. When your investments earn returns, those returns also earn returns over time. If you save enough early on, this snowball effect can grow your money to your target number without any extra contributions. The earlier you start and the more you save up front, the sooner you can reach your Coast FIRE number.
Your Coast FIRE number is the amount of money you need today so that investment growth alone will carry it to your full retirement goal. This number depends on three things: how much you need at retirement, your expected investment growth rate, and how many years you have until retirement. The more time you have, the lower your Coast FIRE number will be, because your money has more years to compound.
Key Inputs Explained
Your retirement goal is calculated by dividing your expected annual spending in retirement by your withdrawal rate. For example, if you plan to spend $100,000 per year and use the common 4% withdrawal rate, you need $2,500,000 at retirement. The 4% rule comes from the Trinity Study and suggests that withdrawing 4% of your portfolio each year gives you a strong chance of not running out of money over a 30-year retirement.
The investment growth rate is the average annual return you expect from your portfolio. A common assumption is 7–8% for a stock-heavy portfolio before adjusting for inflation. Keep in mind that actual returns vary year to year, so this is an estimate, not a guarantee. If part of your portfolio includes dividend-paying stocks, you can use a Dividend Calculator to estimate the income those holdings generate, or a Dividend Yield Calculator to evaluate specific investments.
Adjusting for inflation is important because the cost of living rises over time. A dollar today buys more than a dollar will in 20 years. When you turn on inflation adjustment, the calculator increases your contributions and spending targets by about 2% each year to account for this.
Why Coast FIRE Matters
Coast FIRE gives you options. Once you hit your Coast FIRE number, you can switch to a lower-paying job you enjoy, work fewer hours, or take on less stressful work — all without hurting your retirement plan. You only need to earn enough to pay your current bills. This makes Coast FIRE a popular middle-ground goal for people who want more freedom now but aren't ready to stop working entirely.
Coast FIRE vs. Other FIRE Types
Traditional FIRE means you have saved enough to retire completely and live off your investments. Lean FIRE is the same idea but with a very low annual budget. Barista FIRE is similar to Coast FIRE — you work a part-time or low-stress job — but typically implies you still need that income to supplement your withdrawals. Coast FIRE specifically means your existing investments will grow to your target on their own, so any income you earn only needs to cover present-day expenses.
Tips for Reaching Coast FIRE Faster
- Start early. Time is the most powerful factor in compound growth. Even small amounts invested in your 20s can make a big difference.
- Increase contributions over time. As your income grows, save more. Even a small annual increase adds up.
- Keep fees low. High investment fees eat into your returns. Low-cost index funds are a popular choice in the FIRE community.
- Stay consistent. Market ups and downs are normal. Staying invested through downturns lets you benefit when the market recovers.
- Pay off high-interest debt first. Carrying expensive debt works against your investment returns. Tools like the Debt Snowball Calculator or the Debt Avalanche Calculator can help you build a payoff strategy so more of your money goes toward investments.
- Understand your APY. Make sure you know the actual yield on your savings and investments. The APY Calculator can help you compare options and maximize returns on cash holdings.