sip calculator — the complete guide

A SIP is a fixed amount invested every month into a fund, automatically. Every SIP has three moving parts: the monthly amount, the return, and the tenure. Change any one and the maturity value moves: a bigger amount or return raises it, a longer tenure raises it a lot, because compounding has more time to work. That is the whole mechanism, and everything else in this guide is a consequence of it.

The three inputs, explained

The monthly SIP is what you set aside each month — it should be an amount you can sustain through a bad month, not just a good one. The expected return is your test assumption, not a fund’s promise; try a lower return too, so you see a cautious case alongside the optimistic one. The tenure is the number of years you keep investing. No other input matters for the estimate.

Worked example

₹10,000 a month at 12% a year for 15 years grows to ₹50,45,760. You invest ₹18,00,000, so the gain is ₹32,45,760. Shorten it to 10 years at the same monthly amount and return, and the maturity value falls to ₹23,23,391 — the five missing years cost more than the first ten gained. That exchange — time for growth — is the decision every SIP investor is really making.

What the calculator does not cover

Taxes, fund expenses, exit loads and the fact that real returns vary year to year all sit outside the formula, so a fund’s final value can differ from the projection. Step-up SIPs, where the monthly amount rises each year, also change the picture: they usually end higher than a flat SIP, because later, larger investments still get years to grow. Use the calculator to compare plans, then confirm the details with the fund before investing. This is general information, not investment advice.

Frequently asked questions

What is the difference between maturity value and gain?

The maturity value is the total at the end. The gain is only the growth — the maturity value minus everything you invested.

Does starting early really matter that much?

Yes, because early investments get the most years of compounding. An investment made in year one grows for the whole tenure; one made in the final year barely grows at all.

Is a SIP safer than a lump sum?

It spreads the entry price over many months, which smooths out market ups and downs. It does not remove risk — the final value still depends on how the fund performs.