How this calculator works
- Step 1Find your FIRE number₹1.5 crore₹6,00,000.00 a year ÷ 4%.
- Step 2Let it rise with prices6%The target grows each month by your inflation assumption.
- Step 3Grow your investments₹50,000.00 a monthPlus ₹10,00,000.00 already invested, at 10% a year.
- Step 4Find where they meet22 years 4 monthsThe first month your corpus reaches the moving target.
FIRE stands for financial independence, retire early. Your FIRE number is the corpus whose yearly withdrawal, at your chosen rate, covers a year of expenses.
Worked example
Spending ₹6,00,000.00 a year, the default plan reaches its FIRE number in 22 years 4 months.
- FIRE number today
T₀ = yearly expenses ÷ withdrawal rate- Target after m months
T(m) = T₀ × (1 + g)^(m/12)- Corpus after m months
B₀(1 + j)^m + P × F(m)
- ginflation a year 6%
- jmonthly rate equal to the yearly return 10% a year
- B₀current investments ₹10,00,000.00
- Pmonthly investment, at the start of each month ₹50,000.00
- F(m)what ₹1 a month grows to after m months annuity due
- FIRE number today₹1,50,00,000.00
- Target when reached₹5,51,13,194.34
- Projected corpus then₹5,51,92,268.02
- Time to FIRE22 years 4 months
The target keeps moving. Because prices rise, the corpus has to catch a number that grows every month, not today’s figure.
Reading the result
The withdrawal rate changes the FIRE number more than any other input.
Reaching it takes 28 years 9 months at 3%, 25 years 3 months at 3.5%, 22 years 4 months at 4%.
- Return 2 points lower32 years 6 monthsAt 8% a year instead of 10%.
- Invest ₹25,000 more a month15 years 10 months₹75,000.00 a month instead of ₹50,000.00.
What the estimate leaves out
- Market swingsReturns are assumed steady. Real returns rise and fall, and the order matters.
- TaxesTax on gains and withdrawals is not deducted.
- FeesFund expenses and other charges are not included.
- Changing needsHealth costs and family needs can change spending later in life.
Related retirement tools
FIRE plans an early, open-ended retirement. Standard retirement and withdrawals have their own tools.
For a retirement at a set age with rising expenses, use the retirement planner. The SWP calculator shows how long a corpus lasts under a fixed withdrawal, and the SIP calculator builds the corpus month by month.
Common mistakes
Mistake: Treating a 4% withdrawal rate as proven for India.
Instead: Most studies use past US data; check a lower rate too.
Mistake: Comparing your corpus with today’s FIRE number years from now.
Instead: Compare with the inflation-adjusted target in the schedule.
Mistake: Leaving out yearly costs such as insurance or school fees.
Instead: Add 12 months of real spending, including yearly bills.
Mistake: Counting your home or emergency fund as investments.
Instead: Include only money that can be invested and drawn down.
This calculator shows arithmetic on your assumptions. It does not recommend any product or amount. Mutual fund investments are subject to market risks. Read all scheme-related documents carefully.
Read how we test our calculators, or browse more money calculators.