Investment Growth Calculator
Compound Interest Calculator
Calculate compound interest and watch your investment grow over time. Understand the power of compounding with our free, accurate calculator.
Compound Interest Calculator
Enter your investment details to calculate compound interest and final maturity value.
The initial amount you invest
Expected annual return percentage
How long you plan to invest
How often interest is compounded
Results
Initial Investment
₹100,000
Final Maturity Value
₹215,892
Total Interest Earned
₹115,892
Your investment of ₹100,000 will grow to ₹215,892 in 10 years, earning ₹115,892 in compound interest.
What is Compound Interest?
Compound interest is the interest earned on both your principal investment and the accumulated interest from previous periods. It's often called "interest on interest" and is one of the most powerful concepts in finance.
Exponential Growth
Unlike simple interest which grows linearly, compound interest creates exponential growth. Your money grows faster as time passes because you earn returns on your returns.
Time is Your Advantage
The longer you invest, the more powerful compound interest becomes. Even small investments can grow significantly over decades, making it crucial to start investing early.
Example: Compound Interest in Action
Let's compare ₹1,00,000 invested for 10 years at 8% annual interest:
Simple Interest
Interest = Principal × Rate × Time
Interest = ₹1,00,000 × 8% × 10 = ₹80,000
Final Amount: ₹1,80,000
Compound Interest (Monthly)
A = P(1 + r/n)^(nt)
Final Amount = ₹2,15,892
Extra Earnings: ₹35,892
How Compound Interest Works
Understanding the mechanics of compound interest helps you make better investment decisions and appreciate the value of long-term investing.
Initial Investment
You invest your principal amount (e.g., ₹1,00,000) in a savings account, fixed deposit, mutual fund, or other investment vehicle that offers compound interest.
First Interest Calculation
Interest is calculated on your principal at the specified rate (e.g., 8% annually). If compounding is monthly, 1/12th of the annual rate is applied each month.
Interest is Added
The calculated interest is added to your principal, creating a new balance. This new balance becomes your principal for the next compounding period.
Cycle Repeats
Interest is calculated on the new balance (principal + previous interest), and this process repeats. Each cycle, you earn interest on a larger amount, accelerating growth.
Exponential Growth
Over time, the effect compounds, creating exponential growth. The longer you invest, the more dramatic the difference between your initial investment and final amount.
Compound Interest Formula
The mathematical formula behind compound interest calculations and how each component affects your investment growth.
The Formula
A = P(1 + r/n)^(nt)
Calculate Interest Earned
Compound Interest = A - P
Example Calculation
Principal (P) = ₹1,00,000
Rate (r) = 8% = 0.08
Time (t) = 10 years
Compounding (n) = 12 (monthly)
A = 1,00,000(1 + 0.08/12)^(12×10)
A = 1,00,000(1.00667)^120
A = ₹2,15,892
Interest Earned = ₹2,15,892 - ₹1,00,000 = ₹1,15,892
Impact of Compounding Frequency
More frequent compounding results in slightly higher returns. Daily compounding offers the maximum benefit.
Real-World Example Calculation
Let's walk through a practical example to understand how compound interest grows your investment over time.
Scenario: 5-Year Investment Plan
Investment Amount
₹50,000
Annual Interest Rate
7.5%
Investment Period
5 Years
Compounding Frequency
Quarterly
Year-by-Year Breakdown
| Year | Beginning Balance | Interest Earned | Ending Balance |
|---|---|---|---|
| 1 | ₹50,000 | ₹3,836 | ₹53,836 |
| 2 | ₹53,836 | ₹4,113 | ₹57,949 |
| 3 | ₹57,949 | ₹4,413 | ₹62,362 |
| 4 | ₹62,362 | ₹4,740 | ₹67,102 |
| 5 | ₹67,102 | ₹5,087 | ₹72,189 |
Initial Investment
₹50,000
Total Interest Earned
₹22,189
Final Amount
₹72,189
Key Insight: Notice how the interest earned increases each year (₹3,836 → ₹5,087). This is the power of compounding! In year 1, you earn interest only on ₹50,000. By year 5, you're earning interest on ₹67,102, which is why the interest earned in year 5 is higher than in year 1. Use our Compound Interest Calculator to explore different scenarios.
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Frequently Asked Questions
Common questions about compound interest and how to use our calculator effectively.
Start calculating your investment growth today
Use our Compound Interest Calculator to understand how your money can grow through the power of compounding. See the difference time and interest rates make.