Project your SIP growth

What the SIP Investment Calculator Does

A SIP (Systematic Investment Plan) is a method of investing a fixed amount into a mutual fund at regular intervals, usually once a month. This calculator estimates the future value of those contributions, showing what your steady monthly investments could grow to over time at an assumed rate of return.

It is useful for anyone planning long-term goals such as retirement, a child's education, or a home down payment. By comparing different monthly amounts, durations, and return rates, you can see how much you may need to invest to reach a target.

How It Works: The SIP Formula

The calculator uses the future value of an annuity, assuming each installment is invested and earns compound growth until the end of the period:

FV = monthly * ((1 + r)^n - 1) / r

Here, FV is the future value, monthly is your fixed contribution, r is the monthly rate of return, and n is the total number of monthly installments. Because expected returns are usually quoted as an annual percentage, convert them first: r = annual rate / 12, and n = years * 12.

Worked Example With Real Numbers

Suppose you invest 5,000 per month for 10 years at an expected annual return of 12%.

First convert the inputs: r = 0.12 / 12 = 0.01 (1% per month), and n = 10 * 12 = 120 months. Then apply the formula:

FV = 5,000 * ((1.01)^120 - 1) / 0.01. Since (1.01)^120 is about 3.30039, this gives 5,000 * (2.30039 / 0.01) = 5,000 * 230.039, or roughly 1,150,193.

Your total amount invested is 5,000 * 120 = 600,000, so the estimated gain from compounding is about 550,193.

Factors That Affect Your SIP Result

Small changes in the inputs can shift the final figure significantly because returns compound over many months. Keep these drivers in mind:

• Time horizon: longer durations benefit most from compounding, since later years grow on a much larger base.
• Rate of return: mutual fund returns are not fixed. A 10% versus 12% assumption produces very different outcomes over a decade.
• Contribution amount: increasing the monthly figure scales the result proportionally.
• Step-up SIPs: raising your contribution each year (a top-up) can outpace a flat SIP, though this basic formula assumes a constant monthly amount.

Common Mistakes and Practical Tips

The most frequent error is mixing annual and monthly figures. Always divide the annual return by 12 and multiply years by 12 before using the formula, or the result will be far off.

Remember that the output is an estimate based on a constant return. Actual mutual fund performance varies year to year and can be negative in some periods, so treat the number as a planning guide, not a guarantee.

Also note that this figure is before costs and taxes. Expense ratios, exit loads, and capital gains tax on equity funds will reduce your real take-home value. To plan backward from a goal, adjust the monthly amount or the time horizon until the future value matches what you need.