Retirement Corpus Calculator
This answers a specific question: given what you spend monthly today, how large does your retirement corpus need to be at the day you retire, so that inflation-adjusted withdrawals last through your expected years in retirement?
Future monthly expense = today's expense × (1 + inflation)years to retirement. Corpus = future monthly expense × the present value of an annuity, using a real (inflation-adjusted) monthly return rate over the retirement period.
How to use this calculator
Enter your current monthly expense, years until you retire, an assumed inflation rate, how many years you're planning for after retirement, and an assumed return rate on your corpus during retirement. The calculator shows the inflated monthly expense at retirement and the corpus needed to sustain it.
What this doesn't account for
This assumes constant inflation and constant returns for decades, which real markets never deliver, and doesn't account for other retirement income (pension, rental income, Social Security-equivalent schemes) that would reduce how much corpus you personally need.
Frequently asked questions
Why does the calculator use a 'real' return rate instead of the return rate I entered?
Because your expenses are also rising with inflation every year in retirement, what matters for how long the corpus lasts is the return rate after subtracting inflation, not the raw return rate.
Does this include a pension, EPF or NPS payout?
No. This calculates the total corpus needed assuming it's the only source of retirement income; if you'll also receive a pension or annuity, you need a smaller self-funded corpus than shown here.
What return rate should I assume during retirement?
This calculator doesn't recommend one; typically retirement portfolios shift toward safer, lower-return assets than pre-retirement investing, so consider using a lower rate than an equity-heavy accumulation-phase assumption.
Why does a small change in the assumed inflation or return rate move the answer so much?
Over 20-30 year horizons, small differences in rate compound into large differences in outcome; this is a well-known sensitivity of all long-horizon retirement projections, not a quirk of this calculator specifically.
Should I recalculate this periodically?
Yes. Your actual expenses, inflation, and returns will differ from any assumption made years in advance; treat this as a periodically-revisited estimate, not a one-time answer.
This is a generic financial calculation, not investment, loan or tax advice specific to you. BrokerLens is not a SEBI-registered investment adviser.