Why We Claim This Is India's Most Comprehensive FIRE Calculator

Most FIRE calculators use a single fixed return assumption. We run 5,000 independent simulations using a seeded pseudo-random number generator (mulberry32 PRNG + Box-Muller transform) to model market volatility. The result: P10, P25, P50, P75, and P90 confidence bands showing what your corpus looks like in bad, median, and good market conditions. Same inputs always produce the same result — deterministic and reproducible.

Lean FIRE (80% expenses), Regular FIRE (100%), Fat FIRE (150%), Coast FIRE, Barista FIRE (70% corpus coverage), Slow FIRE (traditional retirement with 20% buffer), Geo-Arbitrage FIRE (60% expenses in a tier-2/3 city), and Expat FIRE (retiring abroad). Every type shows the target corpus, the age you'll reach it, and whether you're already on track. No other Indian tool calculates all 8 simultaneously.

A proprietary 0–100 composite score across: Savings Rate (25 pts), Corpus Progress (20 pts), Asset Allocation (15 pts), Emergency Fund (10 pts), Insurance Coverage (10 pts), Debt Position (10 pts), Income Diversification (10 pts). The score tells you not just when you'll reach FIRE, but how resilient your financial plan is to shocks along the way.

The popular 4% rule comes from US research (Trinity Study, 1998) based on US market and inflation data. India has structurally higher inflation (5–7% CPI vs 2–3% in the US), rupee depreciation risk, and a shorter track record for index funds. We default to 3.5% SWR — more conservative and appropriate for Indian conditions. Advanced mode lets you adjust from 3% to 5% to stress-test different scenarios.

We separate nominal returns from real returns explicitly: Real Return = Nominal Return − Inflation (floored at 0.5% to prevent division errors). Inputs include separate pre-retirement return (your accumulation phase), post-retirement return (typically more conservative — you shift toward debt), and general inflation rate. All three compound differently. Most tools use a single undifferentiated return rate.

Coast FIRE is technically the most difficult FIRE type to calculate correctly. The coast threshold is not a fixed number — it changes every year because it depends on how many years remain until your target retirement age. Our algorithm checks year-by-year: at year Y, is FV(corpus, remaining years) ≥ FIRE target? A static threshold calculation (which most calculators use) gives Coast FIRE ages that are 3–5 years too early.

Model the impact of a home purchase on your FIRE journey: down payment SIP, EMI drag on monthly savings, and net monthly FIRE impact. Family planning covers spouse corpus, children's education (at age 18 and 21), marriage goals, and elder care expenses — all with their own inflation-adjusted future value projections that reduce your corpus at the correct year.

Run 3 independent FIRE scenarios side-by-side with completely separate inputs. Compare what FIRE looks like if you stay in Mumbai vs. move to Pune, if you retire at 45 vs. 50, or if your return rate is 10% vs. 14%. Each scenario runs its own full calculation including Monte Carlo success probability.

Young Professional (age 27, ₹1.2L/month income, aggressive equity), Dual Income (age 32, combined ₹2.5L, joint planning), Family with Kids (age 35, ₹1.8L, education goals), Late Starter (age 45, ₹3L, aggressive catch-up). Each preset fills all inputs with real-world representative numbers — useful for understanding what FIRE looks like for different life situations.

Generate a print-quality FIRE Report (A4) showing all key numbers, projection timeline, FIRE type breakdown, Health Score, and Monte Carlo success probability. Uses window.print() for reliable cross-device output — works on mobile, tablet, and desktop without dependencies on third-party PDF libraries.