I asked ChatGPT to calculate my FIRE number for ₹15 lakh pa, here's how much is needed to retire early…

Calculations for FIRE number: I asked ChatGPT to calculate the required FIRE number to create a corpus for early retirement at 35 with a ₹15 lakh per annum salary. FIRE is the personal finance concept dubbed as “financial independence, retire early”.

The ChatGPT prompt:

I am 35, working in a corporate and earning ₹15 lakh pa. I live in Bengaluru, pay ₹23,000 monthly for rent, ₹10,000 monthly for groceries and utilities, and spend ₹16,000 monthly for leisure and shopping. I want to retire early. What should be my FIRE number?

You’re already thinking about this the right way—FIRE starts with clarity on expenses, not income. Let’s break it down in a practical way.

Your Current Annual Expenses:

• Rent: ₹23,000 × 12 = ₹2.76 lakh
• Groceries & utilities: ₹10,000 × 12 = ₹1.2 lakh
• Leisure/shopping: ₹16,000 × 12 = ₹1.92 lakh
• Total (so far): ~ ₹5.88 lakh a year

You likely have a few more costs (travel, insurance, medical, family support, etc.), so let’s round this up conservatively: Estimated annual expense: ₹6.5-7 lakh.

FIRE formula

A common rule is the ‘25× rule’ (based on the 4% rule): where FIRE corpus = 25 × annual expenses

Your FIRE Number using ₹6.5-7 lakh:

• ₹6.5 lakh × 25 = ₹1.6 crore
• ₹7 lakh × 25 = ₹1.75 crore
• Your baseline FIRE number: ₹1.6–1.8 crore

But this is too simplistic for India, where most people underestimate inflation (especially healthcare and rent in Bengaluru), lifestyle upgrades over time, and longer retirement (you’re 35—could be 40–50 years post-retirement). So, a safer multiplier is:

• 30× expenses ( ₹6.5 lakh) → ₹2–2.1 crore
• 35× expenses ( ₹7 lakh) → ₹2.3–2.5 crore
• Realistic FIRE range: ₹2–2.5 crore

Where do you stand with ₹15 LPA income?

If you save ₹5–6 lakh per year, you’re on a decent path and to hit ₹2–2.5 crore faster, you’ll need a higher savings rate (ideally 40–50%) and equity-heavy investing (mutual funds, index funds).

The bare minimum FIRE number is ₹1.7 crore, a comfortable FIRE number is ₹2-2.5 crore, and a very safe (low stress for future) FIRE number is over ₹3 crore.

Based on your age (35), target FIRE age – let’s assume 50 (15-year horizon), and FIRE corpus midpoint of ₹2.25 crore with expected return (equity-heavy) of 11–12% annually, your SIP requirements are:

• Starting from zero to reach ₹2.25 crore in 15 years, you need roughly ₹55,000 – ₹60,000/month in SIP.
• Increase SIP by 10% every year, invest bonuses fully, and keep equity allocation high to reduce your required SIP by ₹10,000-15,000 per month.

Disclaimer: This story is for educational purposes only. The views and recommendations made above are not of Mint. We advise investors to check with certified experts before making any investment decisions.