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Investment · FINANCIAL TOOLS

FIRE Calculator

Work out the corpus your spending would need, and how long your current saving would take to reach it.

Understand the calculation

Calculation logic, formula, example and guardrails behind the estimate.

How it works

The target comes from two numbers you choose. Annual spending divided by your withdrawal rate gives the corpus: a 4% rate implies 25 times spending, a 3% rate implies about 33 times. The multiple is a consequence of your assumption, not a rule this calculator applies.

Accumulation then runs forward month by month on the **real** return — your return assumption net of your inflation assumption. This matters more than it sounds: the target is expressed in today's spending, so growing the corpus at a nominal rate would compare a future-rupee corpus against a today-rupee target and overstate progress considerably.

More detail

The calculator also reports the monthly amount that would reach the target over the same horizon, given what you already hold, so you can see the gap between what you are doing and what the target implies.

When the target is not reached within 60 years the calculator says so rather than showing a misleading figure.

To model drawing from the corpus once you get there, use the SWP calculator.

Because spending drives both the target and what you can invest, the savings rate calculator.

Formula

Target = Annual spending ÷ Withdrawal rate; real return = (1 + r) ÷ (1 + i) − 1

Accumulation is stepped monthly at the real return rather than solved in closed form, because the stopping condition is reaching the target rather than a fixed number of periods.

Annual spending
What you expect to spend each year, in today's money.
Withdrawal rate
Share of the corpus taken in the first year — your assumption, and the input the target is most sensitive to.
r
Assumed nominal annual return before inflation.
i
Assumed annual inflation.
Worked example

₹12,00,000 of annual spending at a 4% withdrawal rate, with ₹50,00,000 already invested and ₹75,000 a month going in, assuming an 11% return and 6% inflation.

  1. 01Target corpus₹12,00,000 ÷ 0.04 = ₹3,00,00,000
  2. 02Real return1.11 ÷ 1.06 − 1 = 4.72%
  3. 03Still to accumulate₹2,50,00,000
  4. 04At a 3% withdrawal rate insteadTarget becomes ₹4,00,00,000

Dropping the withdrawal rate from 4% to 3% raises the target by a third — from ₹3 crore to ₹4 crore — without changing anything about the spending. That single assumption moves the answer more than the return assumption does, which is why it is an input here rather than a built-in rule.

Frequently asked questions

Common questions about the fire calculator and the assumptions behind it.

Disclaimer

This calculator is provided for general information and planning only. It is not investment, tax or legal advice, and it does not take your personal circumstances into account. Outputs are estimates based on the assumptions stated on this page, exclude taxes and charges unless said otherwise, and market-linked returns are not guaranteed — the value of investments can fall as well as rise. Lending terms, rates and eligibility are decided by the lender. For advice on your own situation, speak to a qualified professional, several of whom you can consult on Finvestalk.