FIRE Number Calculator
Illustrative only. Assumes a constant inflation rate, investment return and withdrawal rate, and monthly investing that rises by the step-up you enter each year, which real life never quite delivers. It does not allow for taxes, health costs or one-off expenses, and a "safe" withdrawal rate is a rule of thumb rather than a guarantee. This is not personalised investment advice.
FIRE stands for Financial Independence, Retire Early. Your FIRE number is the amount your investments need to reach so that a sensible yearly withdrawal can pay for your expenses without you needing to earn. It is worked out by dividing your yearly expenses by a withdrawal rate: at 4%, for instance, the number is 25 times your yearly expenses.
This calculator gives you that number, and also estimates the age at which your current pattern of investing could reach it, allowing for rising expenses along the way. Every assumption is editable, and the results are illustrations to test your own numbers against, not a promise about when anyone can stop working. If you have a fixed retirement age in mind instead, the Retirement Corpus Calculator works from that date.
Frequently asked questions
What is a FIRE number, and how is it calculated?
It is your yearly expenses divided by the withdrawal rate you assume. At a 4% rate that is 25 times yearly expenses; at 3.5% it is about 28.6 times. A lower withdrawal rate needs a larger corpus but is more cautious.
Why does this calculator default to a 3.5% withdrawal rate instead of 4%?
The 4% guideline comes from US studies of 30-year retirements. Someone who stops work in their 40s may need the money to last 50 years or more, and Indian inflation and market history differ, so a somewhat lower rate is a common cautious choice. The rate is editable, so try 3%, 3.5% and 4% to see how much the number moves.
How is FIRE different from a normal retirement plan?
A conventional plan fixes a retirement age and a life expectancy, then works out how much you need by that date. FIRE works the other way round: it starts from your expenses and how much you invest, and shows when you could reach financial independence. The Retirement Corpus Calculator suits the first question; this one suits the second.
Does the FIRE number allow for inflation?
Yes, in two ways. The number shown is in today's money. To estimate when you would reach it, the calculator raises your expenses each year at the inflation rate you enter, so the target keeps moving while your investments grow. The summary also shows what the number becomes in future rupees at that date.
What does this calculator not cover?
It does not model taxes on withdrawals, health and insurance costs that rise with age, one-off expenses such as a child's education or a home, market falls in the first years after you stop working, or any income you might keep earning part-time. These matter a great deal for an early exit, so treat the result as a starting point for a fuller plan rather than a decision on its own.
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