FIRE Retirement Calculator
Calculate your FIRE (Financial Independence Retire Early) number and projected corpus.
Increase monthly investment, extend retirement age, or lower expected expenses.
Written by Anil Gautam · Updated
How is the FIRE number calculated?
The tool first grows your current monthly expenses by inflation until the target retirement age, then turns them into a yearly figure and divides by the safe withdrawal rate. With the starting values (₹60,000 a month, age 30 to 50, 6% inflation), expenses rise by a factor of 1.06^20, about 3.21, to ₹1,92,428 a month. Twelve months of that divided by 4% gives a FIRE number of about ₹5.77 crore.
The withdrawal rate sets the multiple of yearly expenses you need: 25 times at 4%, about 28.6 times at 3.5% and about 33.3 times at 3%. Moving the slider from 4% to 3.5% lifts the default FIRE number from about ₹5.77 crore to about ₹6.60 crore.
How does the calculator project your corpus?
It adds two pieces. Current savings grow once a year at the expected return, so ₹5,00,000 at 11% for 20 years becomes about ₹40.3 lakh. The monthly investment is treated like a SIP, invested at the start of each month and compounded monthly at one-twelfth of the annual return, so ₹50,000 a month for 240 months comes to about ₹4.37 crore. Together they reach about ₹4.77 crore, which leaves the default plan short by about ₹1 crore.
The sliders show what closes the gap. A monthly investment of ₹62,000 lifts the corpus to about ₹5.82 crore and switches the result to on track, while ₹61,000 still falls just short. Keeping ₹50,000 a month and moving the target age to 54 also works: the FIRE number rises to about ₹7.29 crore, but the corpus grows faster, to about ₹7.68 crore.
How should you read the FIRE result?
Every amount is in future rupees. The ₹5.77 crore target at age 50 equals ₹1.8 crore at today's prices, which is 25 times today's yearly expenses of ₹7.2 lakh. A similar effect shows on the monthly expense card, where ₹60,000 of spending today becomes ₹1,92,428 a month by the time you stop working.
Returns, inflation and the monthly investment stay constant for the whole period, with no yearly step-up, and nothing is modelled after retirement beyond the withdrawal-rate multiple. The return slider runs from 6% to 16%, inflation from 3% to 10%, and the withdrawal rate from 2.5% to 6% in quarter-point steps. Set the current age before the target age, since the target slider starts one year above the current age. The SIP Calculator and the NPS Calculator cover parts of the same plan in more detail, and all figures here are calculated in your browser.