Why this calculator is important
This calculator matters because investing decisions usually affect cash flow, insurance cover, tax planning or long-term wealth. A structured result helps you see the gap, the yearly progress and the action required before you commit money.
What you gain from the result
You get a usable estimate, a year-wise progress chart, input summary, downloadable PDF and a clear next step for review. The output is built for practical planning, not only quick entertainment.
How to read the year-wise chart
The bar chart separates your contribution, growth, gap or protection value by year. Use it to see whether the plan depends too much on future returns, too little on current savings, or an unrealistic time frame.
Frequently Asked Questions
What is compound interest and how is it different from simple interest?
Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus all accumulated interest, so your money grows exponentially. Over 20 years at 10%, ₹1 lakh grows to ₹6.7 lakh with compound interest but only ₹3 lakh with simple interest — a difference of ₹3.7 lakh from the same deposit.
How does compounding frequency affect investment returns?
The more frequently interest compounds, the higher the effective return. For a 10% annual rate: annual compounding gives 10.00% effective yield; quarterly gives 10.38%; monthly gives 10.47%; daily gives 10.52%. In mutual funds compounding is effectively continuous since NAV is re-invested every day.
What is the Rule of 72 in compound interest?
The Rule of 72 is a quick mental-maths shortcut: divide 72 by the annual interest rate to estimate how many years it takes to double your money. At 8% your money doubles in 72 ÷ 8 = 9 years. At 12% (typical equity mutual fund) it doubles in just 6 years. At 6% (typical FD) it takes 12 years.
Which investments in India actually give compound interest returns?
Mutual funds (equity, debt and hybrid) reinvest all returns and grow via compounding. PPF compounded annually at 7.1%. NPS compounds over the investment horizon. Fixed deposits compound quarterly or annually. EPF compounds annually at 8.25%. Equity mutual funds offer the highest long-term compounding potential among all these options.
How much does ₹1 lakh grow in 10 and 20 years with compound interest?
At 10% annual compounding: ₹1 lakh becomes ₹2.59 lakh in 10 years and ₹6.73 lakh in 20 years. At 12%: ₹3.11 lakh in 10 years and ₹9.65 lakh in 20 years. At 15% (aggressive equity): ₹4.05 lakh in 10 years and ₹16.37 lakh in 20 years. Use the calculator above to model any starting amount.
What is CAGR and how is it related to compound interest?
CAGR (Compound Annual Growth Rate) is the single annual rate at which an investment would have grown if it compounded uniformly every year. It is the same maths as compound interest but applied backwards to measure past performance. A mutual fund with 14% CAGR over 10 years compounded at 14% per year on average, even if individual years were volatile.
Want help reviewing your Compound Interest result?
Our team at Hatlet Ventures can review this result against your real income, goals, insurance gaps and tax situation — for free.
Sri Balaji is the founder of Hatlet Ventures, a NISM-certified, AMFI-registered mutual fund distributor and IRDAI-licensed insurance advisor based in Tiruppur, Tamil Nadu. He helps families with SIPs, mutual funds, insurance planning, tax-saving investments and long-term financial planning.