COAST FIRE Calculator

The COAST FIRE Calculator is a powerful tool for anyone pursuing financial independence who wants to know exactly when they can stop actively saving for retirement and simply let their existing investments grow on their own. COAST FIRE — part of the broader Financial Independence Retire Early (FIRE) movement — is the point at which your current portfolio is large enough that compound growth alone will carry it to your retirement goal without any further contributions. This calculator helps you find that number, see how many years away you are from reaching it, and visualize your portfolio’s full growth trajectory along the way.

What is COAST FIRE?

COAST FIRE is a strategy where you save aggressively early in your career until you hit a specific portfolio value — your COAST number — after which you no longer need to add anything more to your retirement accounts. From that point, your investments grow through compound interest on their own until you’re ready to retire. Once you’ve coasted, you’re free to work less, switch to a more fulfilling but lower-paying role, or redirect your savings toward other life goals — all while your retirement quietly takes care of itself in the background.

How to Use the COAST FIRE Calculator

Working through the inputs gives you a complete and personalized retirement independence projection:

1. Enter your current age and your target retirement age.
2. Input the current value of your investment portfolio.
3. Enter your expected annual expenses during retirement — the lifestyle you’re planning to fund.
4. Set your expected annual investment return rate and your inflation rate assumptions.
5. Input your safe withdrawal rate — typically 4% is the widely used benchmark.
6. Click “Calculate COAST FIRE” to generate your full results.

Why Use the COAST FIRE Calculator Online?

Whether you’re deep into the FIRE journey or just starting to explore what financial independence could look like for you, this calculator gives you the clarity to make meaningful decisions. Here’s what makes it stand out:

• Precise Calculations: Determines your COAST number — the exact portfolio value you need to reach before you can stop contributing — along with how many years it will take to get there and what your projected retirement portfolio will look like.
• Visual Insights: Displays your portfolio’s growth trajectory through an interactive chart with a clear reference line marking your COAST number, so you can see at a glance when and where your investments cross the threshold.
• Customizable Inputs: Lets you adjust age, current investments, retirement expenses, return rates, inflation assumptions, and withdrawal rate freely — making it easy to model different scenarios and see how each variable shifts your COAST timeline.
• Actionable Insights: Provides detailed feedback on your current readiness, what your expected withdrawal needs will be in retirement, and what your portfolio is on track to deliver — moving beyond just numbers to give you genuinely useful guidance.
• Ideal for FIRE Seekers: Whether you’re targeting early retirement at 45 or simply want more freedom in your 50s, this tool gives you a concrete, data-backed picture of when you can stop saving and start coasting — the kind of clarity that makes long-term financial planning feel real and achievable.