Coast FIRE Calculator
2,44,05,702
31,65,394
Coast FIRE Compounding Path
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The Coast FIRE Math
Calculates the exact amount of investments you need today so that it compounds, on its own, to your final target retirement corpus.
Worked Example: Age 30 with 25 Years to Retire
If your investments earn an inflation-adjusted real return of 5% p.a.:
- Coast FIRE Number = ₹5,00,00,000 / (1.05)^25 = **₹1,47,64,360**
If you already have ₹1.48 Crores invested at age 30, you can 'coast' to retirement without ever saving another rupee.
Coast FIRE: How Aditya Stopped Saving for Retirement at 31 — And Why the Math Says He'll Be Fine
Aditya was 31, and his body was keeping score. Three consecutive quarters of 14-hour days as a UX designer in Bangalore had given him chronic back pain, anxiety-driven insomnia, and an espresso dependency that would concern a cardiologist. He'd been aggressively saving since his first job at 22 — every bonus, every increment, every Diwali gift redirected into index funds and PPF.
One Saturday morning, half-awake over filter coffee, he plugged his numbers into a Coast FIRE calculator. Current portfolio: ₹1.5 Crore. Target retirement corpus at 55: ₹4.5 Crore. Expected real return: 4.5% after inflation. The result hit him like a cold shower: he had already crossed his Coast FIRE number. If he never invested another rupee, his existing portfolio would compound on its own to reach his target.
Aditya didn't quit. But he did something just as radical — he took a 55% pay cut to join a 4-day-a-week design consultancy. His new salary covered rent, groceries, and the occasional weekend trek to Coorg. His retirement? Already handled by compound interest doing its thing in the background, 24/7, including holidays.
Coast FIRE isn't about being lazy. It's about recognising the exact moment when your past discipline buys your present freedom. Most people never run the calculation, so they keep sprinting on a treadmill that's already reached the destination. Run your number. You might be closer than you think — and the years you reclaim are years you can never get back.
Frequently Asked Questions
What is Coast FIRE and how is it different from regular FIRE?
Coast FIRE means you've saved enough that your existing investments will compound on their own to reach your full retirement target—without adding another rupee. Regular FIRE requires you to keep saving until you hit the target corpus. Coast FIRE just means the math is already working in your favour.
How do I know if I've already hit my Coast FIRE number?
Calculate your target retirement corpus (e.g. 25× your annual expenses). Then use the compound interest formula to check: will your current portfolio, growing at your expected real return rate, reach that target by your retirement age? If yes, you've hit Coast FIRE.
Can I stop investing after reaching Coast FIRE?
Technically, yes—your retirement is funded. But many people continue investing at a reduced rate for safety margin, since returns aren't guaranteed. Coast FIRE gives you the freedom to take a lower-paying job, go part-time, or pursue passion projects without worrying about retirement.
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