How to calculate your FIRE number in India

Your FIRE number is the single most important figure in your entire financial life, and most people have never worked it out. It is the size of the investment pot that can quietly pay your bills for the rest of your days without you lifting a finger at a job. Hit it, and work becomes optional. It sounds mystical until you see how it is built, at which point it turns into something you can calculate on the back of an envelope.

The number rests on three inputs, and that is genuinely all: what you spend in a year, how much of your portfolio you are willing to draw each year, and what inflation does to both over time. Let us build it up one piece at a time, with real rupee figures, so by the end you can produce your own.

Step 1: find your true annual spending

This is the foundation, and if it is shaky, everything built on top of it wobbles. Do not estimate from memory, because memory flatters. Instead, take two or three months of actual statements, total them, and scale up to a year. Then deliberately add the costs that hide from a monthly view: the annual insurance premiums, the family holiday, Diwali and wedding season, the laptop you replace every few years, and a real medical cushion.

Say you do this and land on ₹9 lakh a year. Sit with that number. It is not just a budget line now, it is the thing your entire corpus has to be able to generate, forever. That is why five minutes of honesty here is worth more than any fancy fund selection later.

Step 2: choose a withdrawal rate you actually trust

The withdrawal rate is the percentage of your pot you allow yourself to spend in the first year. The famous starting point is 4%, which is where the neat "multiply by 25" rule comes from, since dividing by 0.04 is the same as multiplying by 25. It is clean, memorable, and built on decades of US market history.

The catch is that India is not the United States. Our inflation has usually run hotter, and an early retiree may need the money to stretch across 40 or 50 years rather than 30. Both facts argue for being a little more careful. That is why many Indian planners quietly use 3% to 3.5% instead. It feels conservative, and it is, but that caution is exactly what protects you if the first decade of retirement goes badly. The full argument sits in what is the 4% rule and does it work in India.

FIRE number = annual spending ÷ withdrawal rate. At 4% that is spending × 25. At 3.5% it is about × 28.5. At 3% it is × 33. Same spending, very different targets, so this choice matters.

Step 3: let inflation into the room

Here is the step almost everyone skips, and it is the one that quietly makes FIRE harder than the simple math suggests. The ₹9 lakh you spend today is not what you will spend on the day you retire. If retirement is 15 years away and inflation averages 6%, that same lifestyle will cost you closer to ₹21 lakh a year by then, because prices roughly double every 12 years at 6%.

So your FIRE number should be based on your spending at the moment you stop working, not your spending today. And the withdrawals keep rising with inflation after you retire too, which is the whole reason a fixed-percentage rule can still fall short in a high-inflation country. There is a deeper look at this in how inflation changes your FIRE number.

Putting it together: a full worked example

Let us walk the whole thing through with our ₹9 lakh spender, a cautious sort who wants to sleep well at night.

1. Annual spending today: ₹9,00,000.
2. Chosen withdrawal rate: 3.5%, on the safe side because this is early retirement in India.
3. FIRE number in today money: 9,00,000 ÷ 0.035, which comes to about ₹2.57 crore.
4. Retirement is 15 years away, so inflate that ₹2.57 crore for 15 years of rising costs to get the real target for the day you actually stop.
5. Then work backwards to the monthly investing needed to reach it, allowing for what you already have invested.

Notice that the "today money" figure and the "future money" figure are different, and it is the future one you are actually chasing. This is precisely the kind of multi-step compounding that is miserable to do by hand and trivial for a tool.

The FIRE Planner does the compounding for you. Enter what you already have, a monthly SIP, and an expected return, and it projects the corpus year by year so you can see whether it clears your target.

From number to plan

Once the FIRE number stops being abstract, the natural next question is how to hit it: how large a monthly SIP does it take, and how long will it run? That is exactly what how much should I invest every month to retire early walks through. But the calculation you just did is the anchor for everything else. Everyone talks about returns and fund picks; far fewer start where it actually matters, with a clear-eyed number for the life they want to fund.