FIRE Calculator

The number that buys your time back

With annual expenses of ₹6,00,000 — ₹50,000 a month — and a 4% withdrawal rate, the FIRE number is ₹1,50,00,000. One and a half crore, at which point a portfolio could in principle fund your living costs indefinitely without further employment income.

FIRE — financial independence, retire early — is less about retiring than about the arithmetic of independence. The insight underneath it is that the corpus you need is driven almost entirely by what you spend, not what you earn, and that lowering expenses cuts the target twice over: you need less income, and the money not spent is money invested.

The formula

FIRE number = annual expenses ÷ withdrawal rate

Equivalently, annual expenses × 25 at a 4% rate. 6,00,000 ÷ 0.04 = ₹1,50,00,000.

The leverage of the withdrawal rate is worth seeing directly:

• At 3%: ₹2,00,00,000
• At 3.5%: ₹1,71,42,857
• At 4%: ₹1,50,00,000
• At 5%: ₹1,20,00,000

A single percentage point moves the target by ₹30 lakh — years of saving — which is why the rate deserves more thought than it usually gets.

Where the 4% rule comes from, and whether it travels

The 4% figure derives from the Trinity Study, which examined US market data across the twentieth century and found that a portfolio of roughly 50–75% equities could sustain 4% annual withdrawals, inflation-adjusted, for thirty years with a high probability of not being exhausted.

Applying it to India requires caution on several fronts:

Higher inflation. India has historically run 5–7% against the 2–3% assumed in US studies, which compounds the withdrawal requirement faster.

A longer horizon. Retiring at 40 means funding fifty or sixty years, not thirty. The Trinity conclusions weaken considerably as the period lengthens; for very long horizons a rate closer to 3% to 3.5% is the more defensible assumption.

Healthcare. Without employer cover and with medical inflation well above headline CPI, this is the largest uncontrolled cost in an early-retirement plan.

Sequence risk. A severe market fall in the first few years of withdrawal is disproportionately damaging, because selling into a downturn permanently removes capital.

Reaching it faster

The mathematics of the savings rate is the genuinely surprising part. Time to independence depends almost entirely on the proportion of income saved, not the absolute amount:

• Saving 20% of income: roughly 35–37 years
• Saving 40%: roughly 20–22 years
• Saving 50%: roughly 15–17 years
• Saving 65%: roughly 9–11 years

Because raising the savings rate simultaneously increases contributions and lowers the target expense base, its effect is far stronger than raising returns.

Reading the result

Treat the figure as a checkpoint rather than a finish line. Many people who calculate it find the more useful outcome is not early retirement but a growing buffer that makes work optional in degrees — the ability to take a sabbatical, change careers, or refuse a job on principle.

Note what the number excludes: one-off costs such as a child's education or a house purchase sit outside annual expenses and need separate funding. And in India, where employer-linked health insurance disappears with employment, an independent family floater policy is not optional in an early-retirement plan.

Common mistakes

Underestimating expenses. Base the figure on twelve months of actual tracked spending, not an estimate.

Applying 4% to a fifty-year horizon. Use 3–3.5% for very early retirement.

Ignoring health cover. The single largest hole in most Indian FIRE plans.

Assuming expenses stay flat. Children, ageing parents and healthcare tend to raise them.

Counting an illiquid primary residence as corpus. A house you live in generates no withdrawals.