SIP Investment Calculator
Find out how much your monthly SIP will grow over time.
The fixed amount you invest every month.
Typical equity MF: 10–14%
Min 1, max 60 years
How to Use a SIP Calculator: A Step-by-Step Guide to Planning Your Mutual Fund Investments
If you have ever wondered whether putting away a fixed amount every month into a mutual fund will actually make you wealthy, a SIP calculator answers that question with cold, hard numbers. SIP — Systematic Investment Plan — is not a product itself; it is a method of investing a predetermined sum into a mutual fund scheme at regular intervals (almost always monthly). The magic is that you are buying units at different NAVs each month, averaging out your cost over time. But before you commit to an amount, you need to know where you will land. That is exactly what this calculator does.
What the SIP Formula Actually Calculates
The maturity value of a SIP is not simply "monthly amount × months × return." That would be the formula for a lump sum, and it would massively undercount your gains. Because you invest a fresh instalment each month, each of those instalments earns returns for a different length of time — your first instalment earns returns for all 120 months in a 10-year plan, while your last instalment earns returns for just one month.
The correct formula aggregates all of these individually compounding amounts into one expression:
M = P × [((1 + r)n − 1) ÷ r] × (1 + r)
Where: M is the maturity value, P is the monthly SIP amount, r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the total number of monthly instalments (years × 12). The extra (1 + r) at the end accounts for the fact that SIP payments are typically made at the beginning of each period, giving that instalment one extra month of compounding compared to an end-of-period payment.
Step 1 — Enter Your Monthly SIP Amount
The first input is the simplest: how much can you invest every month without straining your budget? This should be money you will not need for the duration of the investment. A common starting point for salaried individuals is 10–20% of monthly take-home pay, but there is no universal rule. If you are just starting out, even ₹500 a month is a legitimate entry point into equity mutual funds through SIPs.
Important: SIP calculators assume this amount stays constant throughout the tenure. In reality, you can increase your SIP every year (called a step-up SIP), which dramatically improves results — but that requires a different calculator. The basic SIP calculator assumes a flat monthly instalment.
Step 2 — Set a Realistic Expected Return Rate
This is the most consequential input and the one most people get wrong. The annual return rate is not guaranteed — mutual funds do not promise a fixed return. What you are entering here is your expected or assumed average annual return. Some benchmarks to keep in mind:
- Large-cap equity funds: Historical 10-year average tends to fall in the 10–13% range.
- Flexi-cap / multi-cap funds: 12–15% in favourable market conditions over long horizons.
- Debt / liquid funds: 6–8% — much lower volatility, but less growth.
- Aggressive hybrid funds: 10–12% as a rough middle ground.
Financial planners typically use 10–12% for long-horizon projections in India to be conservative. Entering 25% because a fund happened to return that last year will give you misleadingly optimistic projections. The calculator gives you the mathematics; your assumption of the return rate is where the judgment lies.
Step 3 — Choose Your Investment Horizon
The number of years you stay invested is the single biggest driver of your final corpus — more so than the monthly amount or even the return rate. This is because compounding is exponential: the longer the time, the faster your money grows in absolute rupee terms.
To illustrate: a ₹5,000 monthly SIP at 12% annual return produces approximately ₹11.6 lakh after 10 years. Extend that to 20 years and you get roughly ₹49.9 lakh — not double, but more than four times the 10-year figure, even though you invested only twice as long. This is why every personal finance book tells you to start early: time is the real compound interest machine.
Step 4 — Reading the Results
After you click "Calculate Maturity Value," the calculator shows three numbers:
Estimated Maturity Value: This is the total corpus you are projected to have at the end of your SIP tenure. It is the sum of every monthly instalment plus all the returns generated over the entire period.
Total Invested: This is straightforward — monthly SIP amount multiplied by the number of months. It is your actual out-of-pocket cost.
Wealth Gained: The difference between maturity value and total invested. This is the return compounding has delivered. In a long-horizon SIP (15+ years), this number typically dwarfs the invested amount — which is the visual proof that compounding works.
The progress bar below the numbers shows what proportion of your maturity corpus came from your own contributions versus market returns. In a 20-year SIP at 12%, for example, you might find that your own money accounts for only 30–35% of the final value — the rest is compounding at work.
A Practical Example: Planning for Retirement
Suppose you are 30 years old and want to retire at 60 with a corpus of ₹3 crore. You assume a 12% annual return. Working backward: plugging in ₹3,000 monthly SIP over 30 years at 12% gives a maturity value of approximately ₹1.05 crore. To reach ₹3 crore, you would need around ₹8,500–₹9,000 per month — a manageable figure for many salaried professionals. The point is: the calculator lets you experiment with different combinations until you find one that fits both your goal and your current capacity.
What This Calculator Does Not Account For
No SIP calculator — including this one — is a financial plan by itself. A few things it deliberately simplifies: it does not model fund expense ratios (which reduce your effective return by 0.5–2% annually depending on the fund), it ignores exit loads (small penalties for redeeming early), and it does not incorporate inflation (which erodes the real purchasing power of your corpus). It also assumes a flat return rate every year, whereas real equity fund returns are lumpy — great some years, negative in others. The calculated maturity value is a projection, not a guarantee.
For a complete retirement plan, you would want to factor in inflation-adjusted goals, tax on LTCG (currently 10% on gains above ₹1 lakh per year for equity funds), and periodic SIP step-ups. But as a starting point to understand the ballpark potential of disciplined monthly investing, this calculator gives you exactly what you need.
Tips for Getting More Out of Your SIP
Use this calculator to motivate the habit of starting early rather than the habit of investing large. Compare, for instance, ₹3,000/month for 30 years versus ₹10,000/month for 15 years — both at 12%. The first scenario produces a larger corpus despite a smaller monthly commitment, purely because of the longer time in market. Additionally, increase your SIP by 10% each year as your salary grows (a "step-up SIP"). While this calculator models fixed SIPs, even a manual annual increase makes an enormous difference over a decade. Finally, resist the urge to pause your SIP during market downturns — those are exactly the months when your instalment buys more units at lower prices, setting up outsized future gains.