How a SIP Grows Your Money

Quick Answer

A SIP calculator projects what a fixed monthly investment plan grows into over time. You enter the monthly amount, an expected annual return, and the number of years; the tool returns the final value of your SIP returns, the total you put in, and the wealth your returns add on top. Investing $500 a month at a 10% expected return grows to about $102,000 in ten years, of which $60,000 is your own money.

How It Works

A systematic investment plan invests the same amount every month, so monthly investing turns a salary into a portfolio one instalment at a time. Each instalment then compounds for the months it stays invested: the first payment grows for the whole period, the last one barely grows at all. To estimate SIP maturity value, the calculator sums all of those grown instalments, assuming end-of-month investing and monthly compounding. If you add a starting lump sum, it compounds alongside the plan for the full term.

Because you buy at many different market levels, a SIP also averages your purchase price: the same instalment buys more units when prices are low and fewer when they are high. That is the cost averaging effect, and it removes the pressure of picking the right day to invest.

Reading the Result

The headline number is the investment value at the end of the period. The two supporting numbers matter just as much. Total invested is your instalment times the number of months, plus any lump sum; it is the part you control completely. Wealth gained is the difference between the two, the part the market contributed. Early in a plan the gain looks small because instalments have had little time to grow; the curve steepens sharply in the later years, which the timeline below the result makes visible.

SIP Calculator vs Alternatives

Compared with a lump sum projection, a SIP models money that arrives on a schedule, like a salary. A lump sum has more time in the market, so with the same rate and horizon it ends higher; however, it requires the cash up front and concentrates your entry at one price. Compared with a recurring bank deposit, a SIP targets market returns and accepts market swings in exchange. For example, the compound interest calculator answers the lump sum question, and the savings goal calculator inverts this one: it starts from the target and solves for the monthly amount.

Examples

A first salary SIP. $200 a month at 10% for 20 years grows to about $152,000. You contribute $48,000; compounding adds more than twice that amount.

Starting five years earlier. The same $500 monthly plan at 10% reaches about $102,000 in 10 years but about $207,000 in 15 years. In other words, extending the period raises the result faster than the contributions: doubling the period more than doubles the growth, because every instalment gets more time to compound.

With a lump sum. Pairing $1,000 a month with a $5,000 starting deposit at 11% for 15 years lets both streams compound side by side, and the lump sum alone finishes the term at nearly five times its size.

The Formula

FV = P · ((1 + i)^n − 1) / i

where P is the monthly instalment, i is the monthly rate (annual return divided by 12), and n is the number of months. When the return is zero this simplifies to P times n. A starting lump sum L adds L(1 + i)^n on top.

Common Mistakes