COAST FIRE Calculator

The COAST FIRE Calculator is a powerful and eye-opening financial planning tool that tells you exactly how much you need to have saved right now so that your investments can grow on their own — without any further contributions — and still fund your retirement comfortably. COAST FIRE stands for Financial Independence Retire Early, and the core idea behind it is freeing yourself from the pressure of aggressively saving for retirement once you hit a specific number. Once you reach your COAST number, compound interest does the heavy lifting from that point forward, giving you the freedom to work less, switch to a more meaningful but lower-paying career, or simply redirect your income toward other life goals without worrying that your retirement is falling behind.

This calculator takes your current age, target retirement age, existing investments, expected retirement expenses, investment return rate, inflation rate, and safe withdrawal rate, and turns all of that into three key outputs — your COAST number, how many years until you reach it, and what your projected retirement portfolio will look like — along with a dynamic growth chart that makes the journey easy to visualize.

How to Use the COAST FIRE Calculator Online

Getting your COAST FIRE results takes just a minute to set up. Here is how to do it:

Step-by-Step Instructions:

• Enter your current age and your target retirement age in the first two fields. The gap between these two numbers is what determines how many years your investments have to grow before you stop working.
• Enter the current total value of your investment portfolio — this is the amount you have already saved and invested across all retirement and investment accounts combined.
• Enter your expected annual expenses during retirement. This is the amount you anticipate needing each year to cover your lifestyle costs once you stop working, and it is the foundation of your FIRE number calculation.
• Set your expected investment return rate — typically somewhere between 6% and 8% for a diversified long-term portfolio — along with your assumed inflation rate and your chosen safe withdrawal rate, which is most commonly set at 4% based on widely accepted retirement planning research.
• Click “Calculate COAST FIRE” and your results will appear immediately, showing your COAST number — the amount you need before you can stop contributing — the number of years until you reach it at your current savings level, and the projected value of your portfolio at retirement.
• Review the portfolio growth trajectory chart below the results to see a visual representation of how your investments are expected to grow from today through to your retirement date, including the point at which your current savings cross the COAST threshold.

Why Use the COAST FIRE Calculator Online?

• Clear COAST Number in Seconds: Rather than working through the multi-step formula manually — which involves calculating your FIRE number, discounting it back to today using your expected return rate, and accounting for inflation — the calculator handles all of it instantly and presents your COAST number as a single, actionable figure.
• Three Key Outputs Together: The results section delivers your COAST number, the years remaining until you reach it, and your projected retirement portfolio value all in one place, giving you everything you need to assess where you stand and what still needs to happen without having to cross-reference multiple tools or spreadsheets.
• Interactive Growth Chart: The dynamic portfolio growth chart visualizes how your investments are projected to grow between now and retirement, with a reference line marking your COAST number, making it much easier to understand the trajectory of your financial independence journey than reading numbers alone.
• Fully Customizable Inputs: Every assumption in the calculator — return rate, inflation rate, withdrawal rate, retirement age — can be adjusted to match your personal situation or to model different scenarios, so you can see how changing one variable affects your COAST number and timeline without starting over from scratch.
• Actionable Insights on Readiness: Alongside the results, the calculator provides contextual feedback on your current position, letting you know whether you have already reached your COAST number, how close you are, and what the implications are for your withdrawal needs at retirement — turning raw numbers into genuinely useful guidance.
• Ideal for FIRE Seekers and Career Planners: Whether you are someone actively pursuing financial independence, a professional considering a career change to something more fulfilling but less lucrative, or simply a saver who wants to know when they can ease off the accelerator, this calculator gives you the clarity to make that decision with confidence.
• Free and Accessible: No registration, no fees, and works on any device, so you can run your COAST FIRE calculation from anywhere and revisit it as your savings grow or your plans evolve.