Compound Interest Calculator
Calculate how your investments grow with compound interest. See the power of compounding with our accurate calculator using standard banking formulas.
Investment Details
Maturity Value
₹0
Principal Amount
₹1,00,000
Total Interest
₹0
Total Value
₹0
About This Calculator
What is Compound Interest?
Compound interest is the interest calculated on the initial principal, which also includes all of the accumulated interest from previous periods on a deposit or loan. It's often called "interest on interest" and can make a sum grow at a faster rate than simple interest, which is only calculated on the principal amount.
The power of compounding means that your money can grow exponentially over time. The more frequently interest is compounded, the faster your investment grows.
Key Benefits:
- Exponential growth potential over long periods
- Works automatically once invested
- Beneficial for long-term investments
- Higher returns compared to simple interest
Formula & Calculation Method
Compound Interest Formula
A = P(1 + r/n)^(nt)
Where:
- A = Final amount (Principal + Interest)
- P = Principal amount (initial investment)
- r = Annual interest rate (as a decimal, e.g., 10% = 0.10)
- n = Number of times interest is compounded per year
- t = Time period in years
Example Calculation:
For ₹1,00,000 at 10% annual interest compounded monthly for 10 years:
P = ₹1,00,000, r = 0.10, n = 12, t = 10
A = 1,00,000 × (1 + 0.10/12)^(12×10)
A = 1,00,000 × (1.00833)^120
A ≈ ₹2,70,704
How to Use This Calculator
How to Use the Compound Interest Calculator
- Enter Principal Amount: Input the initial investment amount you want to invest.
- Set Interest Rate: Enter the annual interest rate offered by your investment. Higher rates mean faster growth.
- Choose Time Period: Select how many years you plan to keep the investment. Longer periods maximize compounding benefits.
- Select Compounding Frequency: Choose how often interest is compounded (Monthly, Quarterly, Half-Yearly, or Annually). More frequent compounding = higher returns.
- Review Results: See your maturity value, total interest earned, and visualize growth over time with the chart.
💡 Pro Tip:
Start investing early! Even small amounts can grow significantly over long periods due to compounding. Monthly compounding typically yields better returns than annual compounding.
Frequently Asked Questions
What's the difference between compound interest and simple interest?
Simple interest is calculated only on the principal amount, while compound interest is calculated on the principal plus all previously accumulated interest. Compound interest grows faster over time.
How does compounding frequency affect my returns?
More frequent compounding (e.g., monthly vs. annually) results in higher returns because interest is calculated and added more often, allowing you to earn interest on interest sooner.
Is compound interest better for savings or loans?
Compound interest is beneficial for investments and savings (you earn more) but can be costly for loans (you pay more interest). Always understand how it applies to your financial products.
Can I calculate compound interest for irregular deposits?
This calculator assumes a single lump sum investment. For regular deposits (monthly SIP), you'd need an annuity calculator that accounts for multiple contributions over time.
What is the rule of 72?
The rule of 72 is a quick way to estimate how long it takes for an investment to double: divide 72 by the annual interest rate. For example, at 10% interest, your money doubles in approximately 7.2 years.
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CFA with 15+ years in financial planning and investment management.