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A Systematic Investment Plan is a way of investing a fixed amount in a mutual fund at regular intervals, usually every month. Instead of investing one large sum, you drip money in over time, which builds a habit, averages out your buying price, and lets compounding work over the years.

It uses the future value of a monthly investment. Each instalment earns a monthly return and compounds until the end. The formula is M = P x [ ((1 + i)^n - 1) / i ] x (1 + i), where P is your monthly amount, i is the expected return divided by 12, and n is the number of months. Small differences from other calculators come down to whether instalments are counted at the start or end of the month, and to rounding.

A step-up, or top-up, SIP raises your monthly amount by a set percentage every year, usually to match a rising salary. Because the extra money goes in early and compounds, even a 10% annual step-up can grow the final corpus a lot more than a flat SIP of the same starting amount. Switch to the step-up mode to see the difference.

A SIP spreads your investment across many months, so you buy at lots of different prices and average out the ups and downs. A lumpsum puts the whole amount in at once, which can do better if markets rise steadily from there, but exposes the full sum to the timing of that single day. This tool works both ways so you can compare them.

Returns are not guaranteed, because the money is invested in markets. As a rough guide, diversified equity funds in India have often delivered somewhere around 10% to 12% a year over long periods, with plenty of swings along the way, while debt funds sit lower. Use a figure you are comfortable with, and try a lower one too so you see the downside as well as the upside.

A SIP is only the method of investing. The safety and the returns depend on the fund you choose. Equity funds can fall in the short term and are not guaranteed, but tend to reward patience over many years. A SIP reduces timing risk by spreading your entry, but it does not remove market risk.

Many funds let you start a SIP from as little as ₹500 a month, and some go lower. There is no upper limit. The point is to pick an amount you can keep up every month without straining, then raise it over time as your income grows.

No, it shows the pre-tax value in today rupees. Gains on equity mutual funds held over a year are taxed as long-term capital gains, currently at 12.5% on gains above ₹1.25 lakh in a financial year, while debt fund gains are taxed at your slab. Inflation also eats into what the final amount can buy. Tax rules change, so treat the figure as a gross estimate and check the current position.

Yes. SIPs are flexible. You can pause them, stop them, raise or lower the amount, or redeem your units, subject to any exit load or lock-in on the specific fund, for example the three-year lock-in on an ELSS tax-saving fund. Stopping the SIP does not force you to sell what you have already invested.

Treat it as a planning scenario, not a promise. It assumes the same amount every month and a steady return, which real markets never deliver in a straight line. Use it to compare choices and to see how the amount, the time horizon and the return move the outcome, then revisit it as your real numbers change.

Yes on both. It is completely free, there is no sign-up, and the whole thing runs in your browser. Nothing you type is sent anywhere or stored, so your figures stay on your own device.