Retirement Calculator
Estimate the corpus a set of retirement assumptions imply — today's expenses, inflation, years to retirement, years in retirement, and separate pre- and post-retirement return assumptions — plus the required monthly SIP to reach that corpus. This is an illustration based on the assumptions you enter, not a recommendation or a guarantee.
Your assumptions
Adjust the amounts below to see how the estimated corpus and required SIP change.
In rupees, per month, at today's prices.
Not a guarantee — a neutral assumption you choose.
Not a guarantee — used only for the SIP illustration, before retirement.
Not a guarantee — used only for the corpus illustration, during retirement.
Your estimate
Based on today's monthly expense of ₹50,000, 20 years to retirement, 6% assumed inflation, 25 years in retirement, a 12% assumed pre-retirement return, and a 7% assumed post-retirement return, your monthly expense at retirement is estimated at ₹1,60,357, implying an estimated corpus of ₹4,30,79,307 and a required monthly SIP of ₹43,116. This is an illustration of the assumptions entered, not a recommendation or a guarantee.
Based on today's monthly expense of ₹50,000, 20 years to retirement, 6% assumed inflation, 25 years in retirement, a 12% assumed pre-retirement return, and a 7% assumed post-retirement return — the estimated corpus is ₹4,30,79,307, and a required monthly SIP of ₹43,116. This is a mathematical illustration of these assumptions, not a recommendation or a guarantee.
Try changing the inflation or either return assumption to see how sensitive the estimated corpus and SIP are — these figures alone don't guarantee retirement readiness.
Learn about this calculator
Estimates the retirement corpus a set of assumptions imply — today's expenses, inflation, years to and in retirement, separate pre- and post-retirement return assumptions — plus the required monthly SIP to reach that corpus.
This calculator projects your current monthly expense forward to what it might cost at retirement, using your inflation assumption, then estimates the lump sum (corpus) that would fund that inflated expense for your expected years in retirement, at an assumed post-retirement return. It then separately estimates the level monthly SIP, at an assumed pre-retirement return, that would accumulate that corpus by the time you retire.
How it works
It uses the shared engine's retirementPlan() model — a composition of two existing engines (retirementCorpusNeeded() for the corpus, requiredSip() for the SIP), with no formula of its own — and is a different, purpose-built calculation from the general-purpose retirement tool on the legacy /calculator page, which uses its own separate model (one single rate for both phases, a fixed 25-year retirement duration, and an ordinary-annuity corpus convention, versus this page's separate pre-/post-retirement rates, adjustable retirement duration, and annuity-due corpus convention). The two are not equivalent and are not meant to be compared as if they were.
What each input means
- Current monthly expense
- What you spend per month today, at today's prices.
- Years to retirement
- How many years until you retire.
- Assumed inflation
- A neutral assumption you choose — not a forecast.
- Years in retirement
- How many years the corpus needs to support your expenses for.
- Pre-retirement return
- The return assumed on your monthly SIP before you retire — used only for the SIP illustration, not a guarantee.
- Post-retirement return
- The return assumed on the remaining corpus during retirement — used only for the corpus illustration, not a guarantee.
What the results mean
- Estimated corpus needed
- The lump sum this calculation shows would be needed at retirement, under these assumptions.
- Monthly expense at retirement
- Your current expense, projected forward by the inflation assumption to the point of retirement.
- Required monthly SIP
- The level monthly investment, from now until retirement, that this calculation shows would accumulate the estimated corpus — not available when there are 0 years left to retirement.
Assumptions
- Inflation, the pre-retirement return, and the post-retirement return all stay exactly at their entered rates for the entire, often multi-decade, period.
- Monthly expenses in retirement track the inflated version of today's expense exactly.
- The pre-retirement return applies only to the accumulation-phase SIP illustration; the post-retirement return applies only to the retirement-phase corpus illustration — the two are never mixed.
Limitations
- Real inflation, investment returns, and your future expenses can all differ substantially from any single assumption over a multi-decade horizon.
- A post-retirement return of exactly -100% makes the corpus (and required SIP) calculation mathematically undefined; the estimated monthly expense still displays normally in that case.
- With 0 years to retirement, there is no time left to run a monthly SIP toward the corpus, so the required-SIP figure is not available in that case either.
Common mistakes
- Treating a single corpus or SIP figure as a fixed target that guarantees a comfortable retirement — small changes in the inflation or either return assumption move these figures substantially.
- Comparing this figure directly with the legacy /calculator's retirement estimate, which uses a different model (one rate for both phases, a fixed 25-year retirement duration) and different assumptions.
- Using the same number for both the pre- and post-retirement return without considering that your investment mix (and so a realistic assumed return) often differs materially between the two phases.
Example
For example, a ₹50,000 monthly expense today, 20 years to retirement, 6% inflation, 25 years in retirement, a 12% pre-retirement return, and a 7% post-retirement return illustrates a corpus in the range of several crore rupees and a required monthly SIP in the tens of thousands of rupees — small assumption changes move both figures substantially.
FAQ
Is this the retirement corpus or SIP I should target?
No — this is an illustration of what the assumptions imply, not a recommendation. It doesn't know your actual investments, other income, or goals.
Why are there two different return assumptions?
Pre-retirement return is used only for the accumulation-phase SIP illustration; post-retirement return is used only for the retirement-phase corpus illustration. Keeping them separate lets you assume a different return while investing than while drawing down.
Does reaching this corpus or SIP guarantee I'll be financially ready?
No. Real inflation, returns, expenses, and lifespan can all differ substantially from any assumption used here.
See the Required SIP Calculator to explore what a level monthly SIP toward a different target amount could look like, or the SWP Calculator to see how a corpus might be drawn down.
For illustration only. Not investment advice. Mutual fund investments are subject to market risks; read all scheme related documents carefully. Returns assumed are hypothetical and not guaranteed.