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FIRE Number Calculator

Q: How is my Safe Withdrawal Rate calculated?

It is derived from your retirement horizon (life expectancy minus FIRE age) and your post-retirement real return using a reverse-amortisation annuity formula. Longer horizons produce lower, safer rates. A 30-year retirement lands near 4%, while a 50-year horizon lands closer to 3%.

Q: Does this assume any income after retirement?

No. It assumes your corpus is your only source of income in retirement, which is the standard FIRE assumption. If you have substantial passive income that covers your expenses, you likely do not need a FIRE corpus at all.

This free FIRE Number Calculator India shows exactly how much you need to retire early — with a safe withdrawal rate matched to your retirement horizon, not a blanket 4%.

FIRE Number Calculator India — find the corpus you need to retire early

Your Numbers

↻ Prefilled from your earlier inputs

About you

Current Age

yrs

Target FIRE Age

yrs

Monthly Expenses Different before / after retirement

₹

Your average monthly spending (today’s value). Drives your FIRE Number.

Current Corpus

₹

Monthly SIP

₹

Current investments and monthly SIP change how fast you reach FIRE, not your FIRE Number.

Your FIRE Number

₹1.50 Cr

Target corpus to retire at your FIRE age

Years to FIRE

—

on current SIP

On track to retire at

—

vs target

You are 0% of the way to your FIRE number

Current corpus: ₹5L · Gap to FIRE: ₹1.45 Cr

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Retirement Horizon

45 yrs

Life exp minus FIRE age

Real Return (retire)

1.89%

After inflation

Recommended SWR

3.3%

For your horizon

Annual Withdrawal

₹6L

In retirement

The Basics

What is a FIRE Number? How the FIRE Number Calculator India Works

Your FIRE Number is the total investment corpus you need so that you never have to work for money again. Once your portfolio reaches this number, your investment returns can cover your living expenses for the rest of your life. This FIRE Number Calculator India works it out for you in seconds.

It is your annual retirement spending divided by a Safe Withdrawal Rate (SWR). What makes this calculator different: instead of assuming a flat 4%, it derives an SWR from your retirement horizon — the number of years your money must last (life expectancy minus your FIRE age). Retire earlier, and the horizon is longer, so the safe rate is lower and your FIRE Number is bigger.

FIRE Number = Annual Retirement Expenses ÷ SWR

Where SWR is derived from your horizon and post-retirement real return — see below.

SWR = r ÷ [ (1 + r) × (1 − (1 + r)^-H) ]

r = real return after FIRE = ((1 + retirement return) ÷ (1 + inflation)) − 1. H = horizon in years. This is the withdrawal rate that sustains your corpus (in today’s money) across your whole retirement, using beginning-of-year withdrawals. As the horizon grows, the safe rate falls toward your real return.

Indian Context

Why a horizon-based SWR beats a flat 4%

The 4% Rule was derived from US data for a 30-year retirement. In India, inflation is higher (5-7%) and early retirees face 40-50 year horizons — so a flat 4% can be too aggressive. This calculator solves for the rate your own horizon supports: a 30-year retirement lands near 4%, while a 50-year horizon lands closer to 3%. You never have to guess the number — the math sets it.

We flag anything above 4% as higher-risk (the widely stress-tested ceiling), but we never override your inputs. If you genuinely have a shorter horizon, the calculator lets the math stand.

Frequently Asked Questions

How is my Safe Withdrawal Rate calculated?

It’s derived from your retirement horizon (life expectancy minus FIRE age) and your post-retirement real return, using a reverse-amortisation (annuity) formula. Longer horizons produce lower, safer rates. You can see the recommended SWR for your inputs in the results breakdown. Use the SWR Calculator to explore this on its own.

Why is there a toggle for expenses before and after retirement?

By default the calculator assumes your retirement spending equals your current spending. But the two often differ — retirement usually drops EMIs and commuting but adds healthcare and travel. Turn on the toggle to set them separately. Your FIRE Number is always based on your after-retirement expenses, since that’s what the corpus has to fund.

Does this assume any income after retirement?

No — it assumes your corpus is your only source of income in retirement, which is the standard FIRE assumption. If you have substantial passive income (rent, pension) that covers your expenses, you likely don’t need a FIRE corpus at all, and this calculator isn’t aimed at your situation.

My inputs carried over from another calculator — why?

All the Let’s Get FIREd calculators share your inputs, so you only enter your numbers once. Change something here and it updates everywhere. Use the Reset button in the calculator to clear everything and start fresh.

Does this account for tax on withdrawals?

No. In India, LTCG on equity above ₹1.25 lakh/year is taxed at 12.5%. To be safe, increase your retirement expenses by 10-15% or use the more conservative return assumptions. A withdrawal strategy mixing equity, debt, and tax-free instruments (PPF, EPF) can minimise your effective tax rate.

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