Magic of Compounding
Check How Compounding Effect Can Create a Magic in Growing Your Wealth.
Future Value of Lumpsum after 10 years will be
$200,966
Compounding: Monthly (12x per year)
Principal
$100,000
Interest Earned
$100,966
Total Value
$200,966
Simple Interest (For Comparison)
Principal
$100,000
Interest Earned
$70,000
Total Value
$170,000
The Compounding Advantage
$30,966
Extra wealth generated by compounding over 10 years
Year-by-Year Growth: Compound vs Simple Interest
What is Compound Interest?
Compound interest is the interest calculated on both the initial principal and the interest accumulated over previous periods. Unlike simple interest — which is calculated only on the principal — compound interest grows exponentially because interest earns interest.
Albert Einstein reportedly called compound interest the "eighth wonder of the world". The longer you stay invested, the more powerful the compounding effect becomes, creating a snowball of wealth over time.
- Rate of interest — Higher the rate, faster your money grows
- Time — The single most important factor in compounding
- Principal amount — The base on which interest compounds
- Compounding frequency — More frequent compounding (monthly vs annual) accelerates growth
Formula
A = P × (1 + r/n)^(n×t)Where A = Final Amount, P = Principal, r = Annual Interest Rate (decimal), n = Compounding Frequency per Year, t = Time in Years. This calculator assumes monthly compounding (n = 12).
How does Compound Interest Work?
Compound interest works by reinvesting the interest earned back into the principal, so each subsequent interest calculation is made on a larger and larger amount. Here are the key factors that affect how compound interest works:
- Interest Rate — A higher annual rate significantly boosts compounding returns over time. Even a 2% difference in rate can double your final corpus over 20+ years.
- Time Period — The longer you stay invested, the more dramatic the compounding effect. A ₹1 lakh investment at 7% for 30 years grows to ₹7.6 lakhs. The same investment for 10 years yields only ₹2 lakhs.
- Compounding Frequency — Monthly compounding yields slightly more than annual compounding at the same rate, because interest is added more frequently to the principal.
- Inflation — Real returns equal nominal returns minus inflation. At 6% inflation, a 7% nominal return gives only 1% real growth. Aim for investments that beat inflation.
- Fees and Taxes — Expense ratios, exit loads, and capital gains taxes reduce your effective returns. Choose low-cost growth-oriented investments to maximize compounding benefits.
Disclaimer:
- Assumed annual return shall be compounded monthly (12 times per year) unless configured otherwise.
- Closing balances shown are gross of tax. Tax implications will depend on your personal tax situation and the nature of the investment.
- The maximum return of 13% is derived from the 10-year rolling return between 1st Jun'13 and 30th May'23. Actual returns may vary.
- The above is for illustration purpose only and should not be construed as investment advice. Investors are requested to consult their financial advisors before making any investment decisions.
- Mutual Fund Investments are subject to market risks, read all scheme related documents carefully.
Frequently Asked Questions
Compound interest is calculated using the formula: A = P × (1 + r/n)^(n×t), where:
- A = Final amount
- P = Principal (initial investment)
- r = Annual interest rate (in decimal form, e.g. 7% = 0.07)
- n = Number of times interest compounds per year (12 for monthly)
- t = Time in years
Example: ₹1,00,000 invested at 7% p.a. monthly compounding for 10 years: A = 1,00,000 × (1 + 0.07/12)^(12×10) = ₹2,00,967
In mutual funds, compounding happens through the growth option (also called accumulation option). Instead of distributing dividends, any returns or gains are reinvested back into the fund automatically. This means your NAV (Net Asset Value) grows over time as the fund earns returns on returns.
For SIP investors, compounding is even more powerful — each monthly instalment earns returns, and those returns earn further returns in subsequent periods, creating an accelerating growth curve.
Simple Interest is calculated only on the original principal: SI = P × r × t. The interest earned each year stays the same.
Compound Interest is calculated on the principal plus all accumulated interest. Each year, a larger base earns interest, causing exponential growth.
Example with ₹1,00,000 at 7% for 20 years:
- Simple Interest: ₹1,00,000 + ₹1,40,000 = ₹2,40,000
- Compound Interest (monthly): ₹4,03,866
That's a difference of over ₹1.6 lakhs — purely from the compounding effect!
A compound interest calculator helps you:
- Visualize wealth growth — See how your money grows over time without doing complex math
- Compare scenarios — Test different investment amounts, rates, and durations to find the best strategy
- Set financial goals — Use the "Calculate Present Value" mode to find how much to invest today to reach a target future amount
- Understand compounding vs simple interest — See exactly how much extra wealth compounding generates
- Plan SIP investments — Use the SIP tab to see how monthly contributions compound over time