What Is Compound Interest?
Learn how compound interest works and why it is often called the most powerful force in investing.
Table Of Contents
What Is Compound Interest?
Compound interest is interest earned not only on your original investment but also on previously earned interest.
This creates a snowball effect where your money grows faster over time because earnings continue generating additional earnings.
The longer you stay invested, the more powerful compounding becomes.
How Compound Interest Works
Imagine investing ₹100,000 at 10% annual interest.
After one year, you earn ₹10,000 and your balance becomes ₹110,000.
During the second year, interest is calculated on ₹110,000 instead of the original ₹100,000.
This cycle continues, causing investment growth to accelerate over time.
Compound Interest Formula
A = P(1 + r/n)^(nt)
- A = Future Value
- P = Principal Amount
- r = Annual Interest Rate
- n = Number of Compounding Periods Per Year
- t = Time in Years
Simple Interest vs Compound Interest
| Feature | Simple Interest | Compound Interest |
|---|---|---|
| Interest On | Principal Only | Principal + Interest |
| Growth Speed | Linear | Exponential |
| Long-Term Returns | Lower | Higher |
Compounding Frequency
The more frequently interest is compounded, the greater the final investment value.
- Yearly
- Half-Yearly
- Quarterly
- Monthly
- Daily
Monthly and daily compounding generally produce slightly higher returns than yearly compounding.
Compound Interest Examples
- ₹100,000 at 10% for 10 years grows to approximately ₹259,374.
- ₹500,000 at 12% for 15 years grows to approximately ₹2,736,079.
- ₹1,000,000 at 8% for 20 years grows to approximately ₹4,660,957.
Benefits Of Compounding
- Accelerates long-term wealth creation.
- Rewards patience and consistency.
- Helps investments grow exponentially.
- Makes reinvestment highly effective.
- Works across investments, savings accounts, and fixed deposits.
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Use our free Compound Interest Calculator to estimate future value, returns, and investment growth.
Open Compound Interest Calculator →Frequently Asked Questions
What is compound interest?
Compound interest is interest earned on both the original principal and previously accumulated interest.
Why is compound interest powerful?
It allows your money to grow exponentially because interest keeps generating additional interest over time.
What is the compound interest formula?
The formula is A = P(1 + r/n)^(nt), where P is principal, r is annual interest rate, n is compounding frequency, and t is time.
Is compound interest better than simple interest?
For long-term investments, compound interest generally produces higher returns because earnings are continuously reinvested.
Can compound interest be used for SIPs and fixed deposits?
Yes. Many investment products, including SIPs, mutual funds, fixed deposits, and savings accounts, rely on compounding.
Conclusion
Compound interest is one of the most important concepts in personal finance and investing.
By earning interest on both your principal and accumulated earnings, your money can grow significantly over long periods.
The earlier you start investing, the more powerful compounding becomes.