What Is a SIP Calculator?
A SIP (Systematic Investment Plan) calculator is a financial planning tool that estimates the future value of your monthly mutual fund investments using the compound interest formula. By entering your monthly investment amount, expected annual return rate, and investment duration, the calculator projects the total corpus you'll accumulate — broken down into the capital you invested and the returns generated by compounding.
SIP calculators are used by beginners planning their first investment and experienced investors stress-testing different portfolio scenarios. They help you answer critical financial questions: How much will ₹5,000/month grow to in 15 years? How much should I invest monthly to retire with ₹5 Crore? What's the difference between starting SIP at 25 vs 35?
SIP Formula Explained
The standard end-of-month SIP formula is:
FV = P × [ (1 + r)ⁿ − 1 ] / r Where: P = Monthly SIP amount r = Monthly interest rate (annual rate ÷ 12 ÷ 100) n = Total number of months (years × 12) Example: ₹10,000/month @ 12% for 20 years r = 12 ÷ 12 ÷ 100 = 0.01 n = 20 × 12 = 240 FV = 10000 × [(1.01²⁴⁰ − 1) / 0.01] = ₹98.93 Lakhs
Benefits of SIP Investing
Rupee Cost Averaging
SIP automatically buys more units when prices are low and fewer when prices are high. Over time, this averages out your purchase cost below the average NAV, reducing timing risk compared to lumpsum investing.
Power of Compounding
Your returns generate their own returns. Starting with ₹5,000/month at 25 vs 35 can mean a difference of ₹1–2 Crore by retirement age, purely due to 10 extra years of compounding.
Disciplined Investing
SIP instills financial discipline by auto-debiting a fixed amount every month, removing emotional decision-making from investing. You invest through market highs and lows without second-guessing.
Flexible Amounts
SIPs can be started with as little as ₹500/month in most funds. You can increase, pause, or stop anytime. Step-up SIPs let you automatically increase contributions as your income grows.
No Market Timing Needed
Unlike lumpsum investing, SIP removes the need to time the market. Whether markets are at a high or a low, your auto-investment continues, benefiting from all market cycles.
Liquidity
Most open-ended mutual fund SIPs have no lock-in period (except ELSS's 3 years). You can redeem your units anytime at prevailing NAV, making SIP investments liquid compared to FDs and PPF.
Power of Starting Early — Real Examples
The single most powerful variable in SIP investing is time. The difference between starting at 25 vs 35 is dramatic:
| Start Age | Monthly SIP | Duration | Total Invested | Corpus at 60 | Extra from starting early |
|---|---|---|---|---|---|
| Age 25 | ₹5,000 | 35 years | ₹21.00 L | ₹3.22 Cr | Baseline |
| Age 30 | ₹5,000 | 30 years | ₹18.00 L | ₹1.75 Cr | −₹1.47 Cr |
| Age 35 | ₹5,000 | 25 years | ₹15.00 L | ₹93.94 L | −₹2.28 Cr |
SIP vs Fixed Deposit
| Feature | SIP (Equity MF) | Fixed Deposit |
|---|---|---|
| Historical Returns | 10–15% CAGR (equity) | 5.5–7.5% p.a. |
| Return Guarantee | Not guaranteed — market-linked | Guaranteed — fixed rate |
| Inflation Beating | Yes — typically outpaces inflation | Often barely beats inflation |
| Tax on Returns | 10% LTCG above ₹1L (equity, 1yr+) | Taxed as income slab |
| Liquidity | High — redeem anytime (no lock-in) | Penalty for premature withdrawal |
| Minimum Amount | ₹500/month | Typically ₹1,000+ |
| Best for | Long-term wealth creation (5+ years) | Short-term goals, capital protection |
How Inflation Affects SIP Returns
Nominal corpus projections look impressive but don't tell the full story. Inflation erodes purchasing power over time. At 6% annual inflation, prices double every 12 years. A corpus of ₹1 Crore accumulated over 20 years is worth only ~₹31 Lakhs in today's purchasing power.
This is why real returns — returns above the inflation rate — are what matter for long-term financial planning. Equity mutual funds have historically delivered real returns of 6–9% (nominal 12–15% minus 6% inflation), far exceeding fixed deposits which often deliver negative real returns in high-inflation periods.
Use the inflation adjustment toggle in our SIP calculator to convert your projected corpus into today's purchasing power equivalent for more realistic financial planning.
Frequently Asked Questions
Disclaimer: This SIP calculator is for educational and informational purposes only. All projections are estimates based on assumed constant annual returns and do not account for expense ratios, exit loads, taxes, or actual fund performance. Mutual fund investments are subject to market risks. Past performance does not guarantee future results. Please consult a SEBI-registered investment advisor before making any investment decisions.