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A systematic investment plan lets you put a fixed amount of money aside every month instead of trying to invest one large lump sum all at once. Our free SIP calculator shows you what those steady monthly contributions could grow into over time, based on the return rate you expect. Just enter your numbers in the form and you will see your estimated future value, your total invested amount, and your gains in seconds.
How to Use This SIP Calculator
Using the tool takes less than a minute. Type the amount you can set aside each month into the first box — this can be as small as $50 or as large as your budget allows. Next, enter the yearly return you expect from your investment, as a percentage. A figure between 8% and 12% is a common starting point, though your actual results will vary. Finally, enter how many years you plan to keep investing. Press Calculate to see your estimated future value, your total invested amount, and your gains. The Clear button empties the fields so you can try a different plan.
What Is a SIP?
A systematic investment plan, usually shortened to SIP, is a habit of investing the same amount of money on a regular schedule — most often every month. Instead of waiting until you have a large sum saved up, you invest a smaller amount again and again, and each contribution starts earning returns of its own. Over the years, the returns on your earlier contributions begin to earn returns too, and that snowball effect is what makes regular investing so powerful. They fit a normal paycheck: pick an amount you can afford, automate it, and let time do the heavy lifting. If you are comparing a monthly plan with a one-time deposit, our compound interest calculator shows how a single lump sum grows on its own.
The SIP Formula
The calculator uses the standard future value formula for a series of equal monthly payments made at the start of each month:
FV = P × [((1 + i)^n − 1) ÷ i] × (1 + i)
In this formula, P is your monthly investment, i is the monthly interest rate, and n is the total number of monthly payments. To get the monthly rate, divide the annual rate by 12 and by 100. For example, a 12% annual return becomes a monthly rate of 0.01. The number of payments is simply your years multiplied by 12. The extra (1 + i) accounts for each payment being made at the start of the month, so it earns returns for that full month. Your total invested amount is just P multiplied by n, and your estimated gains are the future value minus that invested total.
Worked Example
Suppose you invest $500 every month for 10 years and earn an average annual return of 12%. The monthly rate is 12 ÷ 12 ÷ 100 = 0.01, and the number of payments is 10 × 12 = 120. Plugging those numbers into the formula gives a future value of about $116,169.54. Over the same period you would have put in $500 × 120 = $60,000 of your own money, so the remaining $56,169.54 is the growth your investments generated. Nearly half of that final amount is growth, not your own money — and that share grows the longer you stay invested.
How Time Changes the Outcome
The table below keeps the monthly amount and the return fixed at $500 and 12% a year, and changes only the length of the plan.
| Years | Total Invested | Estimated Future Value |
|---|---|---|
| 5 | $30,000.00 | $41,243.18 |
| 10 | $60,000.00 | $116,169.54 |
| 15 | $90,000.00 | $252,288.00 |
| 20 | $120,000.00 | $499,573.96 |
| 25 | $150,000.00 | $948,817.55 |
| 30 | $180,000.00 | $1,764,956.89 |
Between year 5 and year 10 the future value nearly triples, and it more than triples again between year 20 and year 30 — while your contributions rise by only $60,000 across that last decade. That is the compounding effect at work: the longer your money stays invested, the more each new month of growth builds on a larger base.
Tips and Limitations
Before you treat any number on this page as a promise, keep a few things in mind. First, the return rate you type in is a guess, not a guarantee — real investments rise and fall, and a fund that averaged 12% in the past may not repeat that. It also ignores taxes, fees, and inflation, so $116,000 ten years from now will not buy as much as $116,000 today. Run the numbers twice — once with an optimistic rate and once with a cautious one, such as 8% — so you see a range of outcomes instead of a single hopeful figure. Also, raising your monthly amount even a little each year — say by 5% when you get a raise — can add up to far more than chasing a higher return. For a fixed, predictable return, you can also compare your plan with a bank deposit using our FD calculator.
There is no universal monthly amount. A common rule is to start with whatever you can comfortably afford after paying your bills and keeping an emergency fund — for many people that is $100 to $500 a month. The right figure is one you can keep paying every month for years without stress, because consistency matters more than the starting size.
The return shown is not guaranteed. The calculator assumes a fixed average return for the whole period, but real investments fluctuate. Some years will beat it and some will fall short, so treat the result as a planning estimate, not a promise.
Missing one payment does not end your plan, but it lowers your final value, because that contribution misses out on all the future growth it would have earned. An automatic payment on payday is the simplest way to avoid gaps.
Yes, you can change your monthly amount later. Most investment plans let you raise or lower your monthly contribution whenever you like. Many investors raise it a little each year as income grows, building a much larger final value without a sudden pinch.
Start small, stay consistent, and give your money time — that is the whole secret of a SIP, and the calculator above lets you see exactly what that patience could be worth.