How SIP Returns Work: Estimating Your Mutual Fund Maturity Value
A Systematic Investment Plan turns small monthly investments into long-term wealth through compounding. Here's how to use a SIP calculator to project your maturity value.
What is a SIP?
A Systematic Investment Plan (SIP) invests a fixed amount into a mutual fund every month. Instead of trying to time the market, you invest steadily — buying more units when prices are low and fewer when they're high. Over years, compounding does the heavy lifting.
What the calculator shows you
The SIP Calculator takes three inputs — monthly investment, expected annual return, and tenure — and estimates:
- Maturity value — what your investment could grow to.
- Amount invested — the total you actually put in.
- Total returns — the difference, i.e. money earned on your money.
The maths behind it
SIP maturity uses the future value of a monthly annuity: FV = P × [((1 + i)^n − 1) ÷ i] × (1 + i), where P is your monthly amount, i is the monthly return (annual rate ÷ 12), and n is the number of months. Each instalment compounds for the months that follow it.
An example
Invest 5,000 a month for 15 years at an expected 12% annual return. You contribute 900,000 over the period — but the estimated maturity value is roughly two and a half times that, because your earliest instalments compound the longest.
Three things to remember
- Returns aren't guaranteed. Markets fluctuate; the calculator assumes a constant rate for illustration only.
- Time beats timing. Starting earlier matters far more than picking the "perfect" fund.
- Step up over time. Raising your SIP as your income grows dramatically increases the final value.
Try it
Open the SIP Calculator and model a few scenarios — then explore Pyalm's other free finance tools.