SIP Calculator
What a monthly investment could grow to, with the amount you put in kept separate from what it earned. Includes an annual step-up. Nothing is uploaded.
Raise the monthly amount by this much every year. Leave it at zero for an ordinary SIP.
| Year | Invested so far | Value |
|---|
The gap between the two columns is the whole point. It barely opens for the first few years and then widens quickly, which is why stopping a SIP early costs far more than it looks.
How to use it
- Enter what you can invest every month, and be honest — an amount you actually keep up beats a larger one you stop.
- Set an expected annual return. 10 to 12 percent is the range most people use for an equity fund over a long period, and it is an assumption, not a promise.
- Set the number of years, then try the step-up box if your income rises each year.
The formula
A SIP is an annuity paid at the start of each month, so the maturity value is M = P × (1 + i) × [((1 + i)n − 1) ÷ i], where P is the monthly amount, i is the annual rate divided by twelve, and n is the number of months.
That extra (1 + i) is often left out of explanations. It is there because an instalment paid on the first of the month earns for that whole month, not from the end of it. Leaving it out understates the answer by roughly one month of growth.
Why a step-up changes so much
Five thousand a month at 12% for ten years comes to about 11.6 lakh, of which 6 lakh is your own money. Raise that five thousand by 10% every year and the same ten years come to about 16.9 lakh — but you also put in 9.6 lakh rather than 6.
So a step-up is not free money. It is a way of keeping your investing in step with a rising salary, and the reason it works so well is that the extra amounts still get years of compounding behind them. The earlier years matter most, which is the same reason starting at 25 beats starting at 30 by more than five years of instalments.
What this page cannot tell you
It assumes the same return every single month. No market does that. Real returns arrive in a jagged line, and the order they arrive in changes your outcome even when the average is identical.
It also ignores three real costs: the fund’s expense ratio, any exit load if you redeem early, and the tax on capital gains when you sell. Your actual figure will be lower than the one above. Treat this as arithmetic on an assumption you chose, not as a forecast, and speak to a registered adviser before committing real money.
Frequently asked questions
What is the SIP formula?
The maturity value is the monthly amount times one plus the monthly rate, times the quantity one plus the monthly rate raised to the number of months, minus one, divided by the monthly rate. The monthly rate is the annual rate divided by twelve. The extra one plus the rate is there because an instalment paid at the start of a month earns for that whole month.
What is a step-up SIP?
A SIP where the monthly amount rises by a fixed percentage every year, usually to keep pace with a rising salary. Raising 5,000 a month by ten percent each year for ten years at twelve percent turns roughly 9.6 lakh of investment into about 16.9 lakh, against 11.6 lakh for a SIP that never increases.
Are these returns guaranteed?
No, and nothing on this page should be read as a promise. It assumes the same return every single month, which no market delivers. Real returns arrive unevenly, and the figure ignores the expense ratio, any exit load and the tax on capital gains. Treat it as arithmetic on an assumption you chose, not as a forecast.
Is anything I type sent anywhere?
No. The arithmetic happens in JavaScript inside your own browser. Nothing is uploaded and nothing is saved - close the tab and it is gone.