Compound Interest Calculator — India (₹)

See the extraordinary power of compounding. Compare compound interest vs simple interest across daily, monthly, quarterly, and annual compounding frequencies.

📐 Investment Details
Formula:
CI: A = P × (1 + r/n)^(n×t)
SI: A = P × (1 + r×t)
Effective Rate: 10.471% p.a.
Compounding advantage: ₹70,704
Compound Interest — Final Amount₹2,70,704
Principal₹1,00,000
Total CI Earned₹1,70,704
Simple Interest Amount₹2,00,000
📅 Year-wise Comparison — CI vs SI
YearCI BalanceSI BalanceExtra from CI
1₹1,10,471₹1,10,000+₹471
2₹1,22,039₹1,20,000+₹2,039
3₹1,34,818₹1,30,000+₹4,818
4₹1,48,935₹1,40,000+₹8,935
5₹1,64,531₹1,50,000+₹14,531
6₹1,81,759₹1,60,000+₹21,759
7₹2,00,792₹1,70,000+₹30,792
8₹2,21,818₹1,80,000+₹41,818
9₹2,45,045₹1,90,000+₹55,045
10₹2,70,704₹2,00,000+₹70,704

What is Compound Interest?

Compound interest is interest calculated not just on your initial principal, but also on all the interest earned in previous periods. This creates a snowball effect where your money grows exponentially rather than linearly. The formula is A = P × (1 + r/n)^(n×t), where P = principal, r = annual rate, n = compounding frequency, and t = years.

The contrast with simple interest is dramatic. ₹1 lakh at 10% for 20 years earns ₹2 lakh in simple interest (₹3L total). With annual compounding, the same investment grows to ₹6.73 lakh. With monthly compounding, it reaches ₹7.33 lakh — all from the same ₹1 lakh starting point. This is why Warren Buffett says compounding is the key to wealth building.

How to Use This Compound Interest Calculator

  • Principal Amount: The initial amount you invest or deposit (e.g., ₹1,00,000).
  • Rate of Interest: Annual interest rate (e.g., 10% for equity SIP, 7.1% for PPF, current FD rate).
  • Duration: How many years you keep the investment. Compounding accelerates dramatically in later years.
  • Compounding Frequency: More frequent compounding = more wealth. Monthly compounding is more effective than annual on the same principal and rate.
  • CI vs SI toggle: Switch to see the side-by-side comparison of compound vs simple interest over time.

Key Factors That Affect Compound Interest Growth in India

  • Duration (Time): The most powerful factor. Doubling the duration more than doubles the corpus due to exponential growth. Invest early and stay invested.
  • Rate of Return: Higher rate dramatically amplifies long-term results. ₹1L at 12% for 20 years = ₹9.65L; at 15% it becomes ₹16.4L — a 70% difference from just 3% more return.
  • Compounding Frequency: Daily > monthly > quarterly > annual compounding. FDs compound quarterly, EPF annually, and equity mutual funds effectively daily.
  • Reinvesting Returns: Not withdrawing interest or dividends is essential for compounding to work. Choose the "growth" option in mutual funds rather than dividend payout.

Tips to Harness Compound Interest in India

  • Start as early as possible: ₹10,000 invested at 25 grows to ₹2 crore by 65 at 12%. Starting at 35 gives only ₹60L — a 3x difference from just 10 extra years.
  • Avoid breaking the compounding chain: Never withdraw from long-term investments for short-term needs. Use separate emergency funds so your long-term corpus stays intact.
  • Choose higher-compounding instruments: For short-term, choose monthly-compounding FDs over annual ones. For long-term, equity mutual funds effectively compound at the highest rates historically.
  • Use the Rule of 72: Divide 72 by your annual return rate to find how many years it takes to double your money. At 12% return, your money doubles every 6 years (72÷12=6).

Disclaimer: Compound interest calculations are mathematical projections. Actual investment returns depend on the instrument — bank FD rates, market returns, and government scheme rates change over time.