FIRE Calculator: How to Calculate Your Financial
What is the FIRE movement, how to calculate your FI number using the 4% rule, FIRE variants (Lean FIRE, Fat FIRE, Barista FIRE), and a step-by-step guide.
FIRE stands for Financial Independence, Retire Early. The movement is built on a simple principle: save and invest aggressively, reach a target corpus, and live off the returns — potentially retiring decades before the traditional age of 60–65.
The 4% Rule: Foundation of FIRE
The 4% rule (from the Trinity Study, 1998) states that you can withdraw 4% of your portfolio each year for at least 30 years without running out of money — assuming a diversified equity/bond portfolio.
Your FIRE Number
FIRE Number = Annual Expenses × 25
This is simply the inverse of the 4% rule. If you need ₹10 lakhs/year to live, you need a corpus of ₹2.5 crore. At 4% withdrawal, ₹2.5 crore × 4% = ₹10 lakhs per year.
FIRE Variants
| Type | Annual Expenses | Lifestyle |
|---|---|---|
| Lean FIRE | ₹4–6 lakhs/year | Minimal, frugal lifestyle |
| Regular FIRE | ₹8–15 lakhs/year | Comfortable middle-class |
| Fat FIRE | ₹25+ lakhs/year | Luxury, no compromises |
| Barista FIRE | Partial retirement | Part-time work covers basics, portfolio covers rest |
| Coast FIRE | Stop investing now | Current investments coast to retirement goal without more contributions |
How Long Will It Take?
Your FIRE timeline depends almost entirely on your savings rate — not your income.
| Savings Rate | Years to FIRE |
|---|---|
| 10% | ~43 years |
| 25% | ~32 years |
| 50% | ~17 years |
| 70% | ~9 years |
| 90% | ~3 years |
Assumes 7% real return (after inflation) and spending the rest in retirement.
The India-Specific FIRE Calculation
For Indian FIRE seekers, adjust for:
- Inflation: India's CPI inflation averages 5–6%. Your corpus needs to beat this.
- Healthcare: No universal healthcare — budget ₹5–10 lakhs/year in retirement for health insurance and out-of-pocket costs.
- Withdrawal rate: Many Indian planners recommend 3–3.5% withdrawal rate given longer life expectancy and higher inflation.
- Tax: Equity portfolio withdrawals attract 12.5% LTCG above ₹1.25 lakhs.
Step-by-Step: Building Your FIRE Plan
- Track all expenses for 3 months to get your annual spending baseline.
- Multiply by 25 (or 33 for a 3% withdrawal rate) to get your FIRE number.
- Calculate your current net worth (investable assets only, not your home).
- Determine how much to invest monthly to bridge the gap within your target timeline.
- Optimise: increase income, reduce expenses, or both.
Calculate exactly when you can retire with our FIRE Calculator.