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FIRE — Financial Independence Calculator

Find your financial independence number and years until you can retire early.

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Compound Interest Calculator

Example 1 — Lump sum, no contributions

A = 1,00,000 × (1.10)^10 ≈ ₹2,59,374 — more than 2.5× growth

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📘 What is the FIRE — Financial Independence Calculator?

Financial Independence, Retire Early (FIRE) is the idea of building an investment portfolio large enough that its returns alone cover your living expenses indefinitely — at which point working becomes optional, regardless of your age. This calculator computes your personal FIRE number from your annual expenses, projects how long it will take to reach it at your current savings rate, and shows exactly how much a higher savings rate or lower expenses would shorten that timeline.

⚙️ How FIRE is calculated

The FIRE number formula

The standard FIRE number is your annual expenses multiplied by 25 — derived from the same "4% rule" used in traditional retirement planning (1 ÷ 4% = 25). If you spend ₹6,00,000 per year, your FIRE number is approximately ₹1.5 crore. Once your portfolio reaches this size, withdrawing 4% annually (adjusted for inflation) has historically been sustainable for 30+ years across most market conditions.

Why your savings rate matters more than your income

FIRE timelines are driven primarily by your savings rate — the percentage of income you invest — not your absolute income. Someone earning ₹1,00,000/month and saving 50% reaches FIRE faster than someone earning ₹2,00,000/month and saving 10%, because the second person's expenses (and therefore FIRE number) are also proportionally larger.

The maths of cutting expenses (it counts double)

Reducing your annual expenses by ₹1,00,000 has a compounding effect on your FIRE timeline: it directly lowers your FIRE number by ₹25,00,000 (25× the reduction), AND it likely frees up that ₹1,00,000 to be invested instead — increasing your savings rate at the same time. This is why frugality-focused FIRE strategies can produce surprisingly short timelines.

Lean FIRE, Fat FIRE, and Coast FIRE

"Lean FIRE" targets a minimal expense base (and therefore a smaller FIRE number). "Fat FIRE" targets a more comfortable lifestyle with a correspondingly larger number. "Coast FIRE" is the point at which your existing investments will grow to your full FIRE number by traditional retirement age without any further contributions — useful for people who want to switch to lower-stress, lower-paying work without abandoning long-term financial security entirely.

FIRE number (4% rule)

FIRE number = Annual expenses × 25

Equivalent to a 4% annual safe withdrawal rate

🧮 Worked examples

Example 1 — Standard FIRE

Annual expenses of ₹6,00,000, current investments of ₹10,00,000, investing ₹40,000/month at 11% expected return.

→ FIRE number = ₹1.5 crore · Estimated time to FIRE ≈ 13-15 years

Example 2 — Lean FIRE via expense reduction

Same scenario as Example 1, but annual expenses reduced to ₹4,50,000 by cutting discretionary spending.

→ FIRE number drops to ₹1.125 crore — roughly 25% smaller, shortening the timeline by several years even before accounting for any increase in savings rate

Example 3 — Doubling the savings rate

Same as Example 1, but monthly investment increased from ₹40,000 to ₹80,000.

→ Time to FIRE typically drops by roughly 40-50% — savings rate has an outsized effect compared to return-rate assumptions

💡 Original insights & how to use this calculator

Stress-testing the 4% rule for your situation

The 4% rule was derived from historical US market data over 30-year retirement periods. If you expect to be retired for 40+ years (common for early retirees in their 30s or 40s), consider using a more conservative 3.0-3.5% withdrawal rate — equivalent to a FIRE number of 28-33× annual expenses rather than 25×. Re-run the calculator with your adjusted multiple.

The "one more year" trap

As your portfolio approaches your FIRE number, it's common to feel the pull to work "just one more year" for additional safety margin. Use this calculator to quantify exactly how much an extra year of contributions changes your number — sometimes the gain is smaller than expected once you're already close, which can help with the decision.

Geographic arbitrage and FIRE numbers

Your FIRE number is entirely a function of your annual expenses — which can vary enormously by location. Many FIRE planners model multiple expense scenarios (current city vs a lower-cost city or country) to see how relocation, even temporarily, would change their required portfolio size and timeline.

FIRE is not all-or-nothing

Even if full FIRE feels distant, the "Coast FIRE" framing — the point where your current investments alone will compound to your full retirement number by a traditional retirement age — is often reachable much sooner. Try entering a much later target date with zero further contributions to see your effective Coast FIRE point.