Retirement Calculator — Find Your Actual Corpus Target Before It's Too Late

The retirement number you have in your head is almost certainly wrong

Most people who think about retirement at all have a rough number in mind — "I need ৳1 crore" or "if I have ৳50 lakh I'll be fine." These numbers usually come from intuition rather than calculation, and they almost always dramatically underestimate what's actually needed.

The reasons are predictable: they ignore inflation (what ৳1 crore buys in 30 years is very different from what it buys today), they underestimate how long retirement lasts (potentially 20–30 years), and they fail to account for rising healthcare costs. A retirement calculator replaces the round-number guess with a specific, defensible figure based on your actual situation.

The Retirement Planning Problem in Two Numbers

Here's the core challenge, compressed:

If you're 30 years old, spending ৳60,000/month, planning to retire at 60, and expecting 7% annual inflation, your monthly expenses at retirement will be approximately:

60,000 × (1.07)^30 ≈ ৳4,56,000/month

Not ৳60,000. Not even close. Seven times more, in nominal terms.

And if you need ৳4,56,000/month for 25 years of retirement (to age 85), invested at a post-retirement return of 6.5%, you need a corpus of approximately ৳6.7 crore at retirement.

To accumulate ৳6.7 crore in 30 years with a 10% pre-retirement investment return, you need to invest approximately ৳25,000/month starting today.

This is the cascade of calculations that a retirement calculator handles. None of the individual calculations is difficult. The difficulty is doing them together correctly — and most people never bother, which is why so many people reach their 50s with inadequate retirement savings.

The Key Variables and What Changes Each One

Time to retirement: More years means more compounding and a lower required monthly savings. Starting at 25 vs. 35 roughly triples the compounding advantage. Nothing substitutes for early action.

Life expectancy / retirement duration: If you plan to live to 80 but live to 90, you face a decade of unfunded expenses. Plan to 85–90 unless specific health circumstances suggest otherwise. The cost of under-planning is running out of money; the cost of over-planning is leaving a legacy.

Inflation rate: Even 1% difference in inflation assumption produces dramatically different results over 30 years. Using 6% vs. 8% inflation changes the required corpus by 40–50%. Conservative (higher) inflation assumptions are safer.

Investment return: The expected return on your retirement savings during the accumulation phase. Equity-heavy portfolios targeting 11–13% are appropriate for long horizons. Conservative portfolios at 7–8% require larger monthly contributions.

Post-retirement return: The return on your corpus during drawdown. Typically 5–7% for a conservative retirement portfolio (FDs, debt funds, balanced funds). This affects how long the corpus lasts and how much you can withdraw.

How to Use the Retirement Calculator on sadiqbd.com

1. Enter your current age and target retirement age
2. Enter your current monthly expenses — be honest about your lifestyle cost
3. Set the inflation rate — 7% for moderate planning, 8% for conservative
4. Set the pre-retirement investment return — expected return on your savings
5. Set the post-retirement return — what the corpus will earn during retirement
6. Enter your life expectancy — how long you need the corpus to last
7. Read the results:
   • Inflation-adjusted monthly expenses at retirement
   • Required retirement corpus
   • Required monthly savings starting today

Three Retirement Profiles

The young professional starting early

Mira, 27, spends ৳45,000/month. Retirement target: 58. Life expectancy: 82. Assumptions: 7% inflation, 11% pre-retirement return, 6.5% post-retirement return.

Inflation-adjusted expense at 58: 45,000 × (1.07)^31 ≈ ৳3,98,000/month Required corpus: approximately ৳5.4 crore Required monthly savings at 11% return for 31 years: approximately ৳14,500/month

That's very achievable at 27. Starting 10 years later (at 37) would roughly triple the required monthly savings to ৳43,000/month.

The mid-career course correction

Rafiq, 42, has ৳8,00,000 saved and spends ৳80,000/month. Retirement target: 62. Life expectancy: 80. Same rate assumptions.

Existing savings at 62 (growing at 11% for 20 years): 8,00,000 × (1.11)^20 ≈ ৳6,41,000 Inflation-adjusted expense at 62: 80,000 × (1.07)^20 ≈ ৳3,09,000/month Required corpus for 18 years of retirement: approximately ৳3.8 crore Gap: 3.8 crore − 0.64 crore = ৳3.16 crore still to accumulate Required monthly savings for remaining 20 years: approximately ৳39,000/month

Achievable but demanding — the delayed start has a real cost.

Adjusting lifestyle to change the number

If Rafiq reduces his retirement lifestyle target from ৳80,000 to ৳55,000 in today's money, the required corpus drops proportionally and the monthly savings needed falls to approximately ৳27,000/month — more manageable.

This is the trade-off: lifestyle ambition in retirement vs. savings burden during working years. The calculator makes both sides of that trade explicit.

What the Retirement Calculator Can't Do

It can't predict actual market returns. The return assumptions are estimates. Real returns vary. Running the calculator at multiple return scenarios (optimistic at 12%, base at 10%, conservative at 8%) gives a range rather than a single number.

It can't account for unexpected expenses. Health events, family emergencies, helping children financially — these real-life variables aren't in the model. Building a buffer beyond the calculated corpus is prudent.

It can't make the decision for you. The calculator shows the numbers; you choose the trade-offs. Retire earlier with a tighter lifestyle, or work longer with more cushion? More aggressive investments for higher potential return, or conservative allocation for certainty? These are personal choices the numbers can inform but not resolve.

Frequently Asked Questions

I have a pension or provident fund — how do I factor that in? Estimate the expected lump sum or monthly income from these sources at retirement, reduce the required corpus by that amount, and recalculate. The remaining gap is what personal savings need to fill.

Should I include my home as a retirement asset? Only if you plan to sell or rent it. A home you'll live in generates no income in retirement. A second property generating rent is a legitimate income stream to include in your post-retirement cash flow estimates.

What's a safe withdrawal rate for retirement? The commonly cited guideline is 4% of the corpus annually, adjusted for inflation each year. For a corpus of ৳5 crore, that's ৳20 lakh/year or roughly ৳1.67 lakh/month in year one. Adjust for your country's interest rate environment.

Is the retirement calculator free? Yes — completely free, no sign-up required.

The retirement number you'll get from this calculator will probably be larger than what you had in mind. That's the point — knowing the real number early enough to do something about it is far better than discovering it at 55.

Try the Retirement Calculator free at sadiqbd.com — find your actual retirement corpus target and the monthly savings to get there.