SIP calculator
What a monthly investment becomes over time — and how much of that is growth rather than what you put in.
The maths
How this is calculated.
A SIP is a series of equal payments, so its future value is an annuity-due — each instalment compounds for the months remaining after it is invested.
FV = P × [ ((1 + i)ⁿ − 1) ÷ i ] × (1 + i)
Where P is the monthly instalment, i is the monthly rate (the annual rate divided by twelve) and n is the number of instalments. The trailing × (1 + i) is what makes it an annuity-due rather than an ordinary annuity: it assumes each instalment goes in at the start of the month and therefore earns for that whole month.
What it assumes. A constant rate of return for the entire period. No tax, no exit load, no missed instalments, and no change in the amount. Every one of those assumptions is wrong in reality, which is why this is a projection rather than a forecast.
Worked example
₹ 10,000 a month for ten years.
At an assumed 12 % a year, a ₹ 10,000 monthly SIP over ten years puts in ₹ 12,00,000 across 120 instalments and reaches roughly ₹ 23,23,391. A little under half the final figure is money you put in; the rest is growth on instalments that had time to compound.
Change the rate to 9 % and the same discipline produces about ₹ 19,49,000. That difference — nearly ₹ 4 lakh on identical instalments — is what the return assumption is actually worth, and it is why picking a number you can defend matters more than the calculator does.
Questions about this calculator.
What return rate should I use?
Whatever you can defend. Equity funds in India have historically returned somewhere in the low teens over long periods, but the honest answer is that nobody knows what the next ten years hold. Try a pessimistic rate as well as an optimistic one — the gap between them is the real answer.
Does this account for tax?
No. The figure is pre-tax and ignores exit loads. Long-term capital gains on equity funds are taxed above an annual exemption, so your realised amount will be lower than what this shows.
Why is my actual SIP return different?
Because this assumes a constant rate and reality does not work that way. Two portfolios averaging the same return over ten years can end at different values depending on when the good and bad years fell. For what your book actually earned, XIRR is the right measure.
Does it assume investment at the start or end of the month?
At the start of each month, which matches how most SIP mandates run. That is why the formula carries a final × (1 + i) — each instalment earns for the full month it is invested.
Is my input sent anywhere?
No. The calculation runs in your browser. Nothing is submitted, stored or logged, and there is no email field on this page for exactly that reason.
From the team behind Finvica — the operating platform for multi-product wealth practices. See the platform