# 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.

- URL: https://www.pyalm.com/blog/sip-calculator-guide
- Author: Fadhil Abdulla
- Category: Free Tools
- Published: 2026-06-24
- Updated: 2026-06-24

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## 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](https://www.pyalm.com/free-tools/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

1. **Returns aren't guaranteed.** Markets fluctuate; the calculator assumes a constant rate for illustration only.
2. **Time beats timing.** Starting earlier matters far more than picking the "perfect" fund.
3. **Step up over time.** Raising your SIP as your income grows dramatically increases the final value.

## Try it

[Open the SIP Calculator](https://www.pyalm.com/free-tools/sip-calculator) and model a few scenarios — then explore Pyalm's other [free finance tools](https://www.pyalm.com/free-tools).