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Compound Interest Calculator
Discover the power of compound interest with our free calculator. Albert Einstein reportedly called compound interest the eighth wonder of the world — and for good reason. This calculator shows you how your initial investment grows over time when interest is earned on both the principal and accumulated interest. Choose from yearly, semi-annually, quarterly, monthly, or daily compounding frequencies. Visualise your wealth growth with an interactive chart showing year-by-year projections. Whether you are planning savings, fixed deposits, or long-term investments, understanding compound interest is essential for smart financial planning.
What is Compound Interest?
Compound interest is the interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, compound interest allows your money to grow faster because interest earns additional interest over time.
Compound interest means earning interest on both your original money and the interest already earned.
Example: If you invest ₹10,000 at 10% annual interest, the interest earned in the first year becomes part of the principal for the next year.
- Savings accounts
- Mutual funds
- Fixed deposits
- Investment portfolios
- Retirement accounts
When Does Compound Interest Apply?
Compound interest applies whenever interest is reinvested instead of withdrawn.
- Long-term investments
- Savings accounts
- Fixed deposits
- Mutual funds
- SIP investments
Typical Investment Return Rates
| Investment Type | Average Annual Return |
|---|---|
| Savings Account | 3–4% |
| Fixed Deposit | 6–7% |
| Debt Mutual Funds | 6–8% |
| Equity Mutual Funds | 12–15% |
| Stock Market | 10–15% |
Compound Interest Formula
A = P (1 + r/n)^(nt)
Where P is principal amount, r is annual interest rate, n is number of times interest compounds per year, and t is time in years.
Real Compound Interest Example
Principal = ₹1,00,000
Interest Rate = 10%
Time Period = 5 years
Future Value ≈ ₹1,61,051
Total Interest Earned ≈ ₹61,051
Who Should Use a Compound Interest Calculator?
- Long-term investors
- Students learning finance
- Retirement planners
- Mutual fund investors
- Financial advisors
- Individuals planning wealth creation
Benefits of Compound Interest
- Faster wealth growth
- Long-term investment benefits
- Automatic reinvestment of interest
- Powerful effect over long periods
- Ideal for retirement planning
Common Compound Interest Mistakes
- Withdrawing interest frequently
- Investing for short periods
- Ignoring inflation impact
- Choosing investments with low returns
- Not reinvesting earnings
How to Use This Compound Interest Calculator
- Enter the principal amount (initial investment).
- Enter the annual interest rate.
- Enter the time period in years.
- Select the compounding frequency (yearly, quarterly, monthly, or daily).
- View the total amount, interest earned, and growth chart.
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Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest (calculated only on principal), compound interest grows exponentially, making your money work harder over time.
How does compounding frequency affect returns?
More frequent compounding yields higher returns. Daily compounding earns slightly more than monthly, which earns more than yearly. However, the difference narrows at higher frequencies. Moving from yearly to monthly makes a bigger impact than monthly to daily.
What is the Rule of 72?
The Rule of 72 is a quick formula to estimate how long it takes to double your investment: Years to double = 72 / interest rate. At 8% annual return, your money doubles in approximately 72/8 = 9 years.
Is compound interest good or bad?
Compound interest is excellent for savers and investors — it accelerates wealth growth. However, it works against borrowers (credit cards, loans) where unpaid interest compounds, increasing debt rapidly. Always pay off high-interest debt first.
How is compound interest different from simple interest?
Simple interest is calculated only on the principal: SI = P × r × t. Compound interest is calculated on principal plus accumulated interest: CI = P × (1+r/n)^(nt) − P. Over time, compound interest significantly exceeds simple interest.
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