Retirement and FIRE Calculator
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Retirement and FIRE Calculator summary
Calculation schedule
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Retirement and FIRE calculator formula
The calculator first raises today’s expenses for inflation. It then turns the retirement-year expense into a corpus target.
Years left = retirement age − current age Retirement-year expenses = today’s expenses × (1 + inflation)^years left FIRE target = retirement-year annual expenses ÷ withdrawal rate Projected corpus = grown current corpus + grown future contributions Gap = FIRE target − projected corpus
A withdrawal rate is a planning shortcut. It cannot prove that a corpus will last for life.
The monthly amount solves this one smooth-return example. Real returns, tax and spending will not follow a straight line.
Example with numbers
At age 30, plan for age 45 with today’s annual expenses of ₹6,00,000, 6% inflation and a 4% withdrawal rate. The estimated target is about ₹3.59 crore. Starting with ₹20 lakh and adding ₹6 lakh a year at 10% gives about ₹2.74 crore, leaving a gap near ₹85.30 lakh. The matching monthly contribution is about ₹69,254 in this example.
What is a retirement or FIRE calculator?
FIRE means Financial Independence, Retire Early. The idea is to build enough invested money to support future living costs.
This calculator connects current expenses, inflation, retirement age and investments. It gives a starting estimate, not a pass or fail answer.
How to use the retirement calculator
- Enter current age and target retirement age.
- Enter the yearly expenses that should continue after retirement.
- Enter inflation and the starting withdrawal rate you want to test.
- Add current retirement investments, future contributions and expected pre-retirement return.
What the results mean
- Retirement-year expenses: today’s expenses raised by inflation.
- FIRE corpus target: first retirement-year expenses divided by the withdrawal rate.
- Projected corpus: estimated value of current and future investments.
- Gap and required monthly amount: the shortfall and one monthly contribution that fills it in this scenario.
How this retirement calculation works
Only the entered expense base is inflated. The first retirement-year amount is then divided by the chosen withdrawal rate.
Current investments and future contributions grow until retirement at the return entered by you. The two paths are shown together in the table.
Why a FIRE calculator is useful
- It keeps inflation, investment return and withdrawal rate separate.
- It shows both the target and the projected investments.
- It gives a gap as well as a monthly contribution estimate.
- You can change one assumption and see its effect quickly.
Why a real retirement plan may be different
Healthcare, housing, dependants, pensions and tax may not follow general inflation. Spending can also change after retirement.
Returns arrive in an uneven order. Losses near retirement can hurt a plan even when the long-term average later matches the input.
Sources
- SEBI Investor: Inflation Calculator
- SEBI Investor: Financial Goal Planner
- SEBI Investor: Annuity Payout Calculator
Rule and source review: Planning formulas reviewed 31 August 2026. Every inflation, return and withdrawal figure remains a user scenario.
Disclaimer
This retirement and FIRE calculator gives one planning scenario. It does not guarantee that money will last or recommend a retirement age, return or withdrawal rate. A full plan should also test tax, healthcare, longevity and poor market periods.
Frequently asked questions
What is a FIRE number?
It is an estimated corpus for funding retirement spending. This calculator uses expenses divided by the chosen withdrawal rate.
Does the 4% rule always work?
No. No withdrawal rate is guaranteed. Market order, inflation, tax and retirement length all matter.
Which expenses should I enter?
Enter the current yearly spending that is expected to continue, then consider large irregular costs separately.
Why is the target much larger than current spending?
Spending is first increased for inflation and then divided by a small withdrawal rate.
Can the required monthly amount be zero?
Yes. It is zero when the projected current corpus already reaches the target under the entered assumptions.