What is the Crorepati calculator?
"Crorepati" is the colloquial Indian term for someone with ₹1 crore. The Crorepati calculator reverses the SIP math: given a target corpus and a horizon, what monthly SIP do you need?
Default target is ₹1 Cr, but the tool works for any target – ₹50 L, ₹5 Cr, ₹25 Cr.
How does the math work?
The SIP future-value formula is:
FV = P × [((1 + r)^n − 1) / r] × (1 + r)
We invert it to solve for P:
P = FV / [((1 + r)^n − 1) / r × (1 + r)]
Where:
- FV = target corpus (what you want)
- P = monthly SIP (what we solve for)
- r = effective monthly return rate
- n = number of months to the target
If you already have an existing corpus, we grow it forward at the same annual return and subtract that future value from the target first. The SIP only needs to cover the remaining gap.
What SIP do you need for ₹1 Cr?
At 12% annual return:
| Horizon | Required monthly SIP |
|---|---|
| 10 years | ~₹43,000 |
| 15 years | ~₹20,000 |
| 20 years | ~₹10,000 |
| 25 years | ~₹5,300 |
| 30 years | ~₹2,850 |
Starting 10 years earlier cuts the required monthly amount by 4×. That's compounding.
Why this matters
Most people set a vague "I want to retire rich" goal. This calculator turns a vague goal into a specific monthly commitment you can automate. Once the SIP is set up on salary day, you stop thinking about it.
The two levers to make the SIP more achievable:
- Extend the horizon. Saving for 20 years costs a fraction of saving for 10.
- Increase the return. Moving from 10% to 12% isn't trivial – it requires more equity exposure and the willingness to sit through 30% drawdowns. But it meaningfully reduces the required SIP.
Honest caveats
- Returns are assumed constant. Real markets swing. A 30% drawdown in year 18 of a 20-year SIP can miss the target by a wide margin. Budget for a safety margin.
- Inflation isn't included. ₹1 Cr in 20 years buys roughly what ₹30 L buys today. If your goal is a future expense (college, home, retirement), inflate the target before entering it.
- Tax isn't deducted. LTCG on equity above ₹1.25 L/year is taxed at 12.5%. Factor that into real post-tax return.