How to use the FIRE calculator
FIRE means Financial Independence, Retire Early. This planner estimates the investment pot needed to cover your spending, and when you could reach it under your own saving, return and inflation assumptions. Amounts are shown in rupees using Indian numbering.
- Enter your age, retirement age, current retirement investments, monthly contribution and annual contribution step-up.
- Add your annual spending and adjust the Lean, Fat and part-time income assumptions.
- Choose expected return, inflation and withdrawal rate, then compare all five FIRE paths.
The calculation
Common questions
What is the difference between Lean, Fat, Coast and Barista FIRE?
Lean FIRE uses a smaller spending budget; Fat FIRE uses a larger one. Coast FIRE finds when your current pot can grow to your retirement target without further contributions. Barista FIRE reduces the spending your investments must cover by your expected part-time income.
Does this FIRE calculator account for inflation?
Yes. The real annual return is (1 + expected return) divided by (1 + inflation), minus 1. The actual rupee contribution increases by the chosen step-up after each completed year, then each payment is adjusted for inflation to express results in today’s money. A 0% step-up keeps the actual monthly payment fixed.
Is the calculated retirement age guaranteed?
No. It is a projection using constant assumptions. Actual returns, spending, inflation, taxes and fees can change the outcome. A target outside the model’s horizon is shown as not reached.