Compound Interest Calculator Online
Compound interest is one of the most powerful forces in personal finance. Unlike simple interest which is calculated only on the principal, compound interest is calculated on both the principal and the accumulated interest from previous periods. This means your money grows exponentially over time — the longer you invest, the more dramatic the effect. Use this free compound interest calculator to instantly see how your investment grows with different principal amounts, interest rates, time periods, and compounding frequencies.
₹1,00,000
Principal Amount
₹1,00,000
Interest Earned
₹0
Total Amount
₹0
Simple vs Compound
| Simple | Compound | |
|---|---|---|
| Total | ₹0 | ₹0 |
| Interest | ₹0 | ₹0 |
| +₹0 Extra via Compounding | ||
How to Use This Calculator
- Enter your principal amount — the initial sum you are investing or depositing.
- Set the annual interest rate offered by your bank, FD, or investment.
- Choose the investment duration in years.
- Select how frequently interest is compounded — annually, quarterly, monthly, or daily.
- Your total maturity amount, interest earned, and year-by-year growth appear instantly.
Key Features
- Real-time calculation as you type — no calculate button needed
- Supports all compounding frequencies: annually, semi-annually, quarterly, monthly, daily
- Visual doughnut chart showing principal vs interest split
- Side-by-side comparison of simple interest vs compound interest
- Year-by-year growth breakdown table
- Copy result to clipboard in one click
- Works on all devices including mobile
- Completely free — no signup, no account needed
Use Cases
Planning Savings
Calculating returns on Fixed Deposits (FDs), Recurring Deposits (RDs), or projecting savings account growth over time.
Long-Term Wealth
Planning long-term investments for retirement and understanding the dramatic effect of time on wealth creation.
Comparing Investments
Comparing compounding frequencies to choose the best investment option between different financial products.
Education
Educational use for students and personal finance beginners learning the mathematics behind modern financial systems.
Understanding Compounding Frequency
Compounding frequency simply refers to how often accumulated interest is added to your principal balance. The more frequent the compounding, the more wealth you amass over time, because you start earning interest on your newly gained interest sooner.
Daily compounding gives slightly more than monthly, which gives more than quarterly, which gives more than annual. For instance, ₹1,00,000 invested at 10% for exactly 1 year earns ₹10,000 under annual compounding, but earns ₹10,515 under daily compounding.
Trust & Privacy Notice
This compound interest calculator runs entirely in your browser. No data you enter is sent to any server or stored anywhere. Your financial information remains completely private.
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. This causes your investment to grow at an accelerating rate over time, unlike simple interest which only grows linearly.
How is compound interest different from simple interest?
Simple interest is calculated only on the original principal amount. Compound interest is calculated on the principal plus previously earned interest. Over long periods, compound interest generates significantly higher returns than simple interest.
Which compounding frequency gives the highest returns?
Daily compounding gives the highest returns, followed by monthly, quarterly, semi-annually, and annually. However, the difference between monthly and daily compounding is usually very small in practice.
How do I calculate compound interest manually?
Use the formula A = P × (1 + r/n)^(n×t), where P is the principal, r is the annual interest rate as a decimal, n is the number of times interest compounds per year, and t is the time in years. Subtract P from A to get the interest earned.
Is this compound interest calculator free to use?
Yes, completely free. There is no signup required, no premium version, and no hidden charges. You can use it unlimited times.
Can I use this for Fixed Deposit (FD) calculations?
Yes. Most banks compound FD interest quarterly. Select "Quarterly" as the compounding frequency, enter your FD principal and interest rate, and the calculator will show your exact maturity amount.
How does compounding frequency affect my returns?
The more frequently interest is compounded, the higher the effective annual return. For example, ₹1,00,000 at 8% for 5 years gives ₹1,46,933 with annual compounding but ₹1,49,182 with daily compounding — a difference of over ₹2,000.
How accurate is this calculator?
This calculator uses the standard compound interest formula and is accurate for theoretical calculations. Actual bank or investment returns may vary slightly due to rounding, taxes, or specific product terms.
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