What is Compound Interest?
Compound interest is earning interest on both your initial principal AND the interest already earned. Unlike simple interest (which only earns on principal), compound interest creates exponential growth.
The Formula
A = P(1 + r/n)^(nt)
Where:
- A = Final amount
- P = Principal amount
- r = Annual interest rate
- n = Number of compounding periods per year
- t = Time in years
The Rule of 72
A quick way to estimate how long it takes to double your money: divide 72 by the annual interest rate.
- At 6% return: 72/6 = 12 years to double
- At 9% return: 72/9 = 8 years to double
- At 12% return: 72/12 = 6 years to double
Power of Starting Early
₹1,000/month invested for 30 years at 12% = ₹3.5 crore
₹1,000/month invested for 20 years at 12% = ₹99 lakh
Starting just 10 years earlier results in 3.5x more wealth!
Compounding Frequency Matters
The more frequently interest compounds, the more you earn:
- Annual: ₹10,000 at 10% = ₹11,000
- Monthly: ₹10,000 at 10% = ₹11,047
- Daily: ₹10,000 at 10% = ₹11,052
Use Our Compound Interest Calculator
Use our free Compound Interest Calculator to see exactly how your money can grow with different rates, periods, and compounding frequencies.
Conclusion
The key to benefiting from compound interest is time. Start investing early, reinvest returns, and let time do the heavy lifting.
Written by Toolsys Team
Finance and investment experts at Toolsys.