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Compound Interest.

See how your money grows over time with the power of compound interest. Compare compounding frequencies and view exponential growth charts.

Last updated: June 15, 2026
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Calculation Results

Future Balance ₹19,25,483
Total Invested ₹10,00,000
Total Interest ₹9,25,483

Growth Over Time

Disclaimer: This calculator provides estimates for educational purposes only. Actual rates and terms may vary based on your lender, credit profile, and market conditions.

Quick Answer

How is compound interest calculated?

Compound interest is calculated by adding the accumulated interest back to the principal, so that interest is earned on interest. An initial investment of ₹1,00,000 at 8% annual return over 15 years will grow to ₹3,17,216 if compounded annually, but will grow to ₹3,30,692 if compounded monthly.

Formula
A = P(1 + r/n)^(nt) Where: P = Principal | r = Annual rate | n = Compounding frequency | t = Years
Example
P=₹100,000 | r=0.08 | n=12 (monthly) | t=15 A = 100000(1 + 0.08/12)^(12×15) A = ₹3,30,692 Interest earned: ₹2,30,692
Last updated: June 15, 2026

Why is compounding so powerful?

Albert Einstein reportedly called compound interest the "eighth wonder of the world." The reason is simple: your money generates interest, and then that interest generates its own interest. Over long periods, this creates an exponential growth curve that builds massive wealth.

Compound Interest (Standard)

The formula to calculate the future value of an investment with compound interest is:

A = P(1 + r/n)^(nt)
  • A = Final amount (Principal + Interest)
  • P = Initial Principal balance
  • r = Interest rate (as a decimal)
  • n = Number of times interest applied per time period
  • t = Number of time periods elapsed (Years)

This is the universally accepted standard formula for evaluating exponential growth of fixed-return investments.

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Common mistakes with compound interest.

Mistake: Confusing nominal rate with Effective Annual Rate (EAR)
Correct: 10% compounded daily actually yields 10.51% over the year
Impact: Underestimating the true cost of debt or the real return of an investment
Mistake: Delaying investment by just a few years
Correct: Invest early; a 25-year-old needs to invest significantly less per month than a 35-year-old to reach the same goal
Impact: Losing out on the exponential "hockey stick" curve of compounding that happens in the later years
How is compound interest different from simple interest?

Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal AND the accumulated interest of previous periods. It makes your money grow much faster.

Does compounding frequency matter?

Yes. The more frequently interest is compounded (e.g., daily vs. annually), the more money you make because interest is added to your balance faster.

What is Effective Annual Rate (EAR)?

EAR represents the true annual return you get when factoring in compounding frequency. If your nominal rate is 10% compounded daily, your EAR is actually 10.51%.

Further reading.

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