SIP Calculator — Systematic Investment Plan Return Projections

What is a Systematic Investment Plan (SIP)?

The SIP full form is Systematic Investment Plan, and the name describes the mechanism rather than the product. A SIP is not an asset you buy — it is an instruction to invest a fixed amount into a chosen mutual fund at a fixed interval, almost always monthly. The money buys units of the scheme at whatever the net asset value happens to be on the day the instalment is collected.

That distinction matters more than it sounds. A SIP investment carries no interest rate and no maturity guarantee. What it does have is rupee-cost averaging: because your instalment is a fixed rupee amount, it buys more units when the NAV is low and fewer when it is high, so your average acquisition cost sits below the average price over the period. That is the entire structural advantage of a SIP over investing the same total as a lump sum at a single moment, and it is why SIP suits anyone with a monthly salary rather than a windfall.

How SIP Returns Are Calculated: The Compounding Formula

Used as a SIP returns calculator, the tool above answers how SIP is calculated in practice; this section shows how to calculate SIP returns by hand. Each instalment compounds for a different length of time, so the calculation is a sum over instalments rather than one growth factor. The future value of a SIP is:

P is your monthly instalment and n is the number of months. The trailing (1 + r) is there because a SIP instalment is paid at the start of each month, so every contribution earns one extra period of growth — an annuity-due rather than an ordinary annuity. Dropping that factor understates a ten-year SIP by roughly one percent.

Where r Comes From — and Why It Is Not R ÷ 12

This is the step most SIP return calculators get wrong. The monthly rate is the effective monthly rate derived from the annual CAGR, not the annual figure divided by twelve:

At an annual R of 12%, that gives 0.948879% a month — not 1%. The difference looks trivial and is not: dividing by twelve implicitly assumes monthly compounding of a nominal rate, which would make the true annual return 12.68% rather than 12%. On ₹10,000 a month over ten years the wrong method overstates the corpus by about ₹83,000. The calculator above uses the CAGR method, which is what a quoted annual return actually means.

Worked Example: ₹10,000 a Month at 12% for 10 Years

With r = 0.948879% and n = 120, the formula returns ₹22,40,359 against ₹12,00,000 invested — so ₹10,40,359 of it is growth. Notice that returns exceed 86% of the amount contributed, yet the annual rate is only 12%: that gap is compounding acting on early instalments for the full decade.

SIP Wealth Projections at Common Monthly Amounts

The four instalments people most often start with, projected at a 12% CAGR benchmark. That figure is illustrative, chosen because diversified Indian equity funds have historically been discussed in the 10–15% range over long periods — it is not a rate any scheme offers or guarantees.

Read across any row and the shape of compounding is obvious: doubling the horizon from ten to twenty years does far more than doubling the instalment. ₹10,000 for twenty years (₹91,98,574) beats ₹25,000 for ten (₹56,00,897), on less than half the total contributed. Time in the market is the variable that matters most, and it is the one you cannot buy back later.

How to Invest in SIP: Step-by-Step Guide

Whether you searched how to invest in SIP, how to do SIP, or simply how to SIP, the process is the same one — and shorter than most people expect. The paperwork is one-time, and everything after it runs automatically.

1. 1Complete KYC once — A single KYC through any SEBI-registered intermediary is valid at every fund house in India. This is the only genuinely one-time step, and it is why the second SIP takes minutes rather than days.
2. 2Decide where to invest — You can go direct to the AMC, use a registrar such as CAMS or KFintech, or use a platform. On where to invest in SIP, the practical choice is between direct plans — no distributor commission, lower expense ratio — and regular plans bought through an advisor.
3. 3Choose the scheme, not the AMC — What is AMC in SIP? The Asset Management Company is the fund house that runs the scheme — SBI Mutual Fund, HDFC AMC, Nippon India. You are selecting a scheme within one, and the scheme category matters far more than the brand on it.
4. 4Authorise the debit mandate — UPI AutoPay activates within about a day and suits smaller instalments. An OTM or NACH mandate handles larger amounts and takes a few working days to register with your bank.
5. 5Set the date and forget it — Choose a date shortly after your salary credit so the balance is reliably there. A bounced mandate carries a bank charge and interrupts the compounding you are paying for.

SIP vs Lumpsum Mutual Fund Investments

Any mutual fund calculator has to answer this eventually, and the honest answer is that the comparison depends entirely on whether you already hold the money. A lump sum invested at the start of a rising period beats a SIP over the same window, because every rupee was working from day one. A SIP wins when the market falls first and recovers, because the later instalments bought in cheaply. Nobody knows in advance which case applies.

What settles it in practice is that most people do not have a lump sum — they have a salary. For them the choice is not SIP versus lumpsum at all; it is SIP versus not investing. On the common question of which SIP is best for 3 years, the more useful framing is that three years is short for equity: over a horizon that brief, category selection matters far more than fund selection, and a debt or hybrid scheme is often the better fit than a small-cap one whose drawdowns need longer to recover.

To model a single upfront investment instead, use the lumpsum calculator. If you expect your income to rise and want the instalment to rise with it, the step up SIP calculator — also searched as a top up SIP calculator — models an annual increase, which this projection does not.