A Systematic Investment Plan (SIP) lets you invest a fixed sum into a mutual fund every month, automatically. The SIP calculator shows what that monthly amount could grow into over years — using the standard future-value-of-annuity formula and an assumed rate of return.
What is SIP?
A SIP is not a product. It is a method — specifically, the method of investing the same amount of money on the same date every month into a mutual fund of your choice. The fund house automatically allocates units to you at whatever the day's NAV happens to be, no matter whether the market is up or down. This unit-by-unit accumulation is the simplest possible way to invest, and it has quietly become the default for crores of Indian retail investors over the last decade.
Two forces drive SIP returns. The first is rupee-cost averaging — because you buy when prices are high and also when they are low, your average purchase price tends to be smoother than if you tried to time the market. The second is compounding — every rupee of return earned in year 1 also earns returns in years 2, 3, and 4. The longer the SIP runs, the more dramatic the compounding effect.
The SIP calculator does not predict the future. It applies a chosen annual return rate to your monthly contributions and shows the future value if returns are constant. Real markets are not constant — equity funds may return 8% one year and 22% the next. But if you want to know roughly what ₹10,000 a month for 15 years could become, the calculator gives you the answer in a few seconds.
How SIP returns are calculated
The calculator uses the future value of an annuity formula, which assumes contributions are made at the start of each month and earnings compound monthly. Each ₹10,000 contribution earns interest for the remaining months in the SIP — the first contribution compounds for the full duration, the last one for just one month.
- P
- Monthly investment—the SIP amount you contribute every month
- r
- Monthly rate of return—expected annual return divided by 12, expressed as a decimal (12% becomes 0.01)
- n
- Total months—duration of the SIP in years × 12
- FV
- Future value—the corpus at the end of the SIP
How to use this calculator
The SIP calculator works in real time. As you adjust the sliders, the future value, total invested, and estimated gains update instantly along with the breakdown chart.
Choose your monthly investment
This is the amount you can comfortably set aside every month. Most investors start at ₹500–₹5,000 per fund. The minimum SIP for most equity funds in India is ₹500. For a meaningful retirement corpus, aim for at least 10–15% of your monthly income across all SIPs combined.
Set an expected annual return
This is the most contested input. For Indian equity funds over long periods (10+ years), historical CAGR sits in the 11–14% range. Use 10% for conservative estimates, 12% as a middle-ground assumption, and 14% only if you want to see the optimistic scenario. For debt funds use 6–7%, for hybrid funds 8–9%, for international funds 9–11%.
Set the investment duration
SIPs work harder the longer you give them. The same ₹5,000 monthly for 5 years grows to ~₹4 lakh, but for 25 years it grows to over ₹95 lakh — same monthly amount, just more time. Always run the calculator at the longest realistic duration first to see the upside, then shorten if needed.
Read the gains breakdown
The chart shows the split between your invested amount and the gains. In a 15-year SIP at 12%, gains typically exceed the invested amount — meaning compounding has done more work than your contributions. This is the moment many investors first really understand what compounding means.
Check the wealth multiplier
This number is FV ÷ Total invested. A multiplier of 2.5× means your money has more than doubled. For long SIPs, a multiplier above 3× is common at 12%+ assumed returns. Useful for quickly comparing different durations or rates.
Why people use a SIP calculator
Setting a retirement target
Pick the corpus you want at age 60, the years until retirement, and a realistic 10–12% return. The calculator tells you the monthly SIP needed to hit that target.
Saving for a child's education
Costs for a 4-year engineering or medical degree are projected to cross ₹50 lakh by 2040. A SIP started when the child is born has 18 years to grow — even a modest ₹5,000/month at 12% reaches close to that figure.
Building a home down payment
A 20% down payment on a ₹1 crore house is ₹20 lakh. Working backwards from the target date — say 7 years — shows the monthly SIP needed.
Saving for a wedding
Indian weddings often need ₹15–30 lakh of liquid funds. Plug in the target and timeline; equity SIPs make sense if the timeline is 5+ years, debt funds if it is closer.
Comparing investment vehicles
Run the same monthly amount across different rate assumptions: 7% (PPF), 9% (debt fund), 12% (equity fund). The compounding gap over 20 years is striking.
Step-up planning
If you can increase your SIP by 10% every year (matching salary growth), the corpus is dramatically larger. This calculator does not include step-up directly — use it to estimate the base case, then add 25–35% for a typical step-up scenario.
Common mistakes to avoid
Picking a return rate based on the last 3 years of fund performance
3-year returns are heavily influenced by market cycles. Use rolling 10-year or 15-year returns, or just stick to 11–12% for equity funds to stay grounded.
Treating the SIP calculator output as guaranteed
It is a projection, not a guarantee. Build a 20–25% buffer into your goals — if you need ₹50 lakh in 15 years, plan for ₹60 lakh.
Stopping the SIP when markets crash
Crashes are when SIP delivers most value — you accumulate units cheaply. Investors who continued through 2008 and 2020 saw the best long-term returns.
Running too many SIPs in similar funds
Three large-cap funds plus two flexi-cap funds is over-diversification — they hold mostly the same stocks. Consolidate to 4–5 SIPs across distinct categories instead.
Forgetting to step up the SIP each year
Inflation eats into the real value of a fixed SIP. Increase by at least 8–10% annually to keep up with rising costs and growing income.
Glossary
- NAV (Net Asset Value)
- The per-unit price of a mutual fund, calculated daily. Your monthly SIP contribution buys whatever number of units the NAV allows that day.
- Rupee-cost averaging
- Because you invest the same amount every month, you naturally buy more units when prices are low and fewer when prices are high. Over time this smooths your average cost.
- CAGR (Compound Annual Growth Rate)
- The annualised rate of return over a multi-year period, compounded. The most honest measure of fund performance.
- XIRR
- Extended internal rate of return — the actual return you earned on a SIP, given that contributions happened on different dates. More accurate than simple CAGR for SIP investors.
- AUM (Assets Under Management)
- The total money a fund manages. Useful as a proxy for fund size but does not directly affect your returns.
- Expense ratio
- The annual fee charged by the fund, expressed as a percentage of your investment. Lower is better. Index funds typically charge 0.1–0.5%, active equity funds 1–2%.
- ELSS
- Equity Linked Savings Scheme — equity mutual funds that qualify for ₹1.5 lakh deduction under Section 80C, with a 3-year lock-in.
- Step-up SIP
- A SIP where the monthly contribution increases by a fixed percentage (e.g., 10%) every year. Builds a much larger corpus over time.
- SWP (Systematic Withdrawal Plan)
- The opposite of a SIP — withdrawing a fixed amount from a mutual fund every month. Often used during retirement.
- Lock-in period
- Minimum holding period before you can redeem. ELSS has 3 years; most other equity funds have none, but hold for 1+ year for favourable tax treatment.
Frequently asked questions
What is a SIP?
What return rate should I assume?
Are SIP returns taxable?
References
- AMFI — SIP definition and best practices— Association of Mutual Funds in India
- SEBI Mutual Fund regulations— Securities and Exchange Board of India