Retirement Corpus Calculator
The corpus you need, what you are on course for, and the SIP that closes the gap.
Your savings by age
Year-wise drawdown in retirement
Saving until you retire
How this was calculated
Results are estimates for general information and planning, not financial advice. Banks and institutions may calculate differently (rounding, fees, rate changes). Confirm figures with your lender or a qualified adviser before deciding.
About the Retirement Corpus Calculator
How much do you need on the day you retire? Enough to pay your living costs every month — rising with inflation — until the age you plan for, while the money that is left keeps earning a return. This calculator works out that retirement corpus as the present value of an inflation-rising stream of withdrawals, then compares it with what your current savings and monthly SIP are on course to become.
If there is a gap, it shows the extra monthly SIP (with an optional yearly step-up) or the one-time investment today that closes it, the age at which your current plan would run out, and a year-wise drawdown of the corpus through retirement. All calculations run in your browser, and every number comes with the formula behind it.
How to use it
- Enter your age now, the age you want to retire at and the age to plan until.
- Enter your monthly expenses in retirement in today’s money, and your assumptions for inflation and for the return before and after retirement.
- Add the retirement savings you already have and your monthly SIP towards retirement, with a yearly step-up if you plan to raise it.
- Read the corpus needed and how far your plan gets you. The extra SIP or one-time amount closes any shortfall; the chart and tables show your savings by age and the drawdown year by year.
Examples
Inflation 6% · return 12% before and 8% after retirement · ₹5 lakh saved · ₹10,000 SIP
Corpus needed ₹6,70,77,649 (₹1.17 crore in today’s money) · on course for ₹4,57,89,693 · shortfall ₹2,12,87,956 → ₹6,909 more a month, or ₹7,10,548 once today
Without the extra SIP the money would run out at about 75. Expenses reach ₹2,87,175 a month by 60.
On course for ₹7,61,74,520 — a surplus of ₹90,96,871
How the corpus is worked out
First, today’s monthly expense E is grown by inflation g for the n years until you retire: E_R = E × (1 + g)^n.
In retirement the money is withdrawn at the start of every month and the rest earns the post-retirement return r (a monthly rate i = (1 + r)^(1/12) − 1). The withdrawal stays level through a year and rises by g each year. The corpus is the present value of those withdrawals over the N years of retirement — the standard present value of a growing annuity:
Corpus = E_R × ä12 × (1 − k^N) ÷ (1 − k), with k = (1 + g) ÷ (1 + r) and ä12 = (1 − (1 + i)^−12) × (1 + i) ÷ i, the value of twelve monthly payments of ₹1 made at the start of each month. When g equals r, the corpus is simply E_R × ä12 × N.
Your plan and the gap
Your savings grow at the pre-retirement return until you retire, and your SIP is invested at the start of every month (rising every 12 months if you add a step-up) — the same method as the SIP calculator. The shortfall is the corpus needed minus that projected value. The extra SIP is the shortfall divided by what a SIP of ₹1 a month (with the same step-up) would grow to; the one-time amount is the shortfall discounted back to today at the pre-retirement return.
The drawdown table follows the corpus year by year: the needed corpus reaches exactly zero at the age you plan for, while your projected savings either last with money to spare or run out earlier.
Choosing your assumptions
Small changes compound over decades, so try a range. A higher inflation or a lower post-retirement return raises the corpus sharply; retiring later shortens retirement and lengthens saving at the same time. Planning to a later age — 90 rather than 85 — protects against outliving your money, which is the costlier mistake. If you will receive a pension, reduce your expenses by it — remembering that a pension which does not rise with inflation covers less each year. Withdrawals of a steady amount from a volatile portfolio also face the order of returns: see the SWP calculator and the FIRE calculator.
Limitations
- Uses a steady return and a steady inflation rate. Real markets vary, and a fall early in retirement does more harm than the average suggests.
- Taxes on withdrawals, health costs that rise faster than general inflation, and one-off expenses (a house, children’s education) are not modelled.
- Ages are in whole years; contributions stop at retirement and withdrawals start in the same month.
- Your expenses, inflation and returns are your assumptions — nothing here is guaranteed or a recommendation.
Privacy
Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.
Frequently asked questions
How much money do I need to retire?
Enough to pay for your expenses, rising with inflation, for every year from retirement until the age you plan for. The calculator works that out from your own numbers; for a person spending ₹50,000 a month today, retiring in 30 years and planning for 25 years of retirement, it comes to about ₹6.7 crore at 6% inflation and an 8% return in retirement.
Why is the corpus so much bigger than today’s expenses suggest?
Inflation compounds. At 6% a year, prices multiply by about 5.7 in 30 years, so ₹50,000 a month today becomes about ₹2.87 lakh a month at retirement — and keeps rising afterwards.
Should I count EPF, PPF and NPS in my savings?
What return should I assume after retirement?
Usually less than before retirement, because the money moves into steadier investments when you need regular withdrawals. There is no guaranteed figure: try a cautious rate and see how much the corpus changes.
What if the extra SIP is more than I can afford?
Combine levers: add a yearly step-up so the SIP grows with your income, retire a little later, plan for lower expenses, or invest a lump sum now. Each changes the result immediately, so you can try them.