📈 Compound Interest Calculator
When does your money start working for you?
Last updated: March 2026
* This calculator is for educational purposes only and does not constitute financial advice.
Compound interest is the foundation of SIP investing. Your returns generate additional returns, creating exponential growth. This is why equity mutual funds and NIFTY 50 index funds are so powerful for long-term wealth creation in India.
Our calculator identifies the 'tipping point' — when your annual investment gains exceed your total yearly SIP contributions. From that point, your money works harder than you do. PPF, EPF, and mutual fund SIPs all benefit from this principle.
Enter an initial amount, monthly SIP, expected return (12% for equity, 7% for PPF), and period. See your final corpus, total deposits, and how much came from compound interest growth.
📊 How does this compare to a Nifty 50?
⚡ Popular Scenarios
FAQ
What is compound interest?
Returns earning returns. In a SIP, each month's investment compounds immediately, creating massive wealth over decades.
What is the tipping point?
When annual gains exceed yearly SIP contributions. At 12%, this happens around year 12-15.
Where does compounding work?
PPF, EPF, NPS, equity SIPs, and RDs all benefit. Start early, stay invested.
How much will ₹10,000/month SIP be worth after 25 years?
₹10,000/month SIP at 12% annual return for 25 years grows to approximately ₹1.90 crore. Total investment is only ₹30 lakhs — meaning ₹1.60 crore is pure compounding profit!
What is the Rule of 72?
Divide 72 by the annual return to find how long money takes to double. At 12% (typical equity SIP), your money doubles every 6 years. At 15%, every 4.8 years. A powerful mental shortcut for every Indian investor.
SIP vs lump sum — which is better?
SIP wins for salaried investors: rupee-cost averaging smooths volatility, and discipline beats timing. Lump sum beats SIP ~65% of the time mathematically, but SIP is more practical and psychologically easier to maintain over decades.
Is this better than a SIP investment?
A typical Indian equity SIP delivers ~12% annual returns. Compare your compound interest result against this benchmark — if your chosen rate is higher, your investment outperforms a standard SIP. However, SIPs in diversified equity funds like NIFTY 50 offer rupee cost averaging and lower volatility, making them ideal for most Indian investors.
How does this compare to a SIP?
Compare your results to investing in a Nifty 50 at ~12% annually. Use this as a baseline to evaluate your investment decision.
How much are expense ratios really costing you? Check with the Expense Ratio Calculator
📊 Data source: Standard financial models. Prices and data in this article are reviewed and updated semi-annually. Last update: May 2026.
📈 Compound Interest: The Force Einstein Called the 'Eighth Wonder of the World'
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Created by Amiel Riss | SmartMoney77
Who Is This Calculator For?
New investors
You've heard that investing early matters, but you want to see the actual numbers. This calculator shows exactly how small monthly contributions — even 200 or 500 — grow over 10, 20, or 30 years.
Parents planning ahead
Whether you're starting an education fund at birth or catching up when your child is 10, this tool shows you realistic outcomes based on consistent contributions and historical market returns.
Pre-retirees
If you're wondering whether it's "too late," the Popular Scenarios above include a Late Starter example. Spoiler: it's almost never too late, but the numbers change dramatically with each decade of delay. Try the Cost of Waiting Calculator to see the difference.
Common Mistakes to Avoid
Using unrealistic return rates. The S&P 500 has averaged ~10% nominal over 20+ year windows. Using 12% or 15% will make your projections look amazing — and wrong. Stick to 7–10% for realistic planning.
Forgetting inflation. 1,000,000 in 30 years will buy roughly what 400,000 buys today (at ~3% inflation). To model real purchasing power, reduce your return rate by 2–3%.
Stopping contributions during downturns. Market drops feel scary, but continuing to invest at lower prices is how compounding accelerates. The biggest mistake is pausing when prices fall.
Ignoring fees. Even 1% in annual management fees can reduce your final balance by 25–30% over 30 years. Check with the Killer Fees Calculator →
How This Calculator Works
FV = P(1+r)^n + PMT × [((1+r)^n − 1) / r]- Compounding
- Monthly, with contributions at the end of each period
- Returns
- Nominal (not inflation-adjusted). To estimate real returns, subtract 2–3% from the annual rate
- Not included
- Taxes, investment fees, currency fluctuations
- Benchmark
- The S&P 500 comparison uses ~10% average annual return over the same period
- Disclaimer
- This calculator is for educational purposes only and does not constitute financial advice