What do I need to set aside each month?

About ₹32,099 a month for twenty years at 12% a year if you want ₹1 crore of today’s purchasing power. If you mean ₹1 crore as a nominal figure, ignoring what it will buy by then, the answer is ₹10,009 a month.

Those two numbers answer different questions and the gap between them is the single most useful thing on this page. Most articles and most calculators quote the second one, because it is the arithmetic that falls out of taking the reader’s figure at face value.

Because you almost certainly meant it in today’s money. A crore is a figure people use to describe a standard of living, and standards of living are priced in current rupees. At 6% inflation, matching today’s ₹1 crore in twenty years takes ₹3.21 crore. Untick the box beside the target and the tool takes your figure literally instead, which is the right choice when the goal is a fixed nominal amount such as a loan repayment.

6% is a reasonable general assumption for India and it is the default here. It is the wrong number for two common goals.

Education has run closer to 10% a year at Indian private institutions and higher again for study abroad, where the currency moves as well. Healthcare has run ahead of headline inflation too. For a wedding or a car, general inflation is about right. Move the assumption to fit the goal rather than accepting one number for all of them.

Put it in Already invested and the monthly figure falls, sometimes sharply. Existing capital is compounding for the full horizon without you adding to it, so it does disproportionate work on a long goal: ₹10 lakh already invested cuts the ₹32,099 a month above to ₹21,197, because that ₹10 lakh becomes roughly ₹1.09 crore on its own over twenty years at 12%.

On the default figures the monthly amount rises from ₹32,099 to ₹36,639, an increase of about 14% for a delay of 5% of the horizon. That disproportion is the whole point of compounding, and it is why the honest framing of a goal calculator is not what you will have but what waiting costs. The line under the result recomputes it on your own numbers.

For most people it is more achievable, because a level ₹32,099 from today is a larger share of a current salary than of a future one. The step-up SIP calculator solves the same target with an annual increase, which starts lower and ends higher. The total paid in is usually greater; the starting commitment is smaller, and the plan is likelier to survive year three.

Then the honest options are to extend the horizon, lower the target, or accept that you will be short. Raising the assumed rate is the fourth option and it is the one that does nothing except make the shortfall arrive later and larger.

Extending is usually the cheapest lever. The same ₹1 crore in today’s money over twenty-five years rather than twenty needs ₹22,617 a month rather than ₹32,099, close to a third less for five more years of patience.

Yes, because the horizon determines what the money can sensibly be invested in, and mixing a three-year goal with a twenty-year one into a single pot forces both into the wrong answer. A goal three years out cannot afford equity volatility; a goal twenty years out cannot afford to sit in a deposit. Running this page once per goal gives you a separate monthly figure for each, which is also how the money should be held.