Compound Interest Calculator
Calculate compound interest on your investments with different compounding frequencies. See how your money grows over time with detailed yearly breakdown.
Compound Interest Calculator
About This Calculator
Compound interest is the interest calculated on the initial principal and also on the accumulated interest of previous periods. It's often referred to as "interest on interest" and can significantly boost your investment returns over time.
Our compound interest calculator allows you to experiment with different compounding frequencies (annually, semi-annually, quarterly, monthly, or daily) to see how they affect your investment growth.
Compound Interest Formula:
A = P(1 + r/n)^(nt)
Where:
- A: Final amount
- P: Principal amount
- r: Annual interest rate (decimal)
- n: Number of times interest is compounded per year
- t: Number of years
Compounding Frequencies:
- Annually: Once per year
- Semi-annually: Twice per year
- Quarterly: Four times per year
- Monthly: 12 times per year
- Daily: 365 times per year
The more frequently interest is compounded, the more interest you earn on your investment.
Frequently Asked Questions
What is compound interest and how does it work?
Compound interest is interest calculated on the initial principal and also on accumulated interest from previous periods. It's "interest on interest." For example, ₹10,000 at 10% compounded annually becomes ₹11,000 in year 1, then interest is calculated on ₹11,000 in year 2, creating exponential growth over time.
What is the compound interest formula?
Formula: A = P(1 + r/n)^(nt), where A is final amount, P is principal, r is annual interest rate, n is compounding frequency per year, and t is time in years. Our calculator uses this formula automatically - just enter your principal, rate, time, and compounding frequency.
How does compounding frequency affect returns?
Higher compounding frequency yields higher returns. ₹10,000 at 10% for 10 years: Annual compounding = ₹25,937, Monthly compounding = ₹27,070, Daily compounding = ₹27,179. The difference increases with time and principal. Daily compounding maximizes returns but the difference vs monthly is small.
What is the difference between simple and compound interest?
Simple interest is calculated only on principal: ₹10,000 at 10% for 10 years = ₹20,000 (₹10,000 interest). Compound interest includes interest on interest: Same inputs with annual compounding = ₹25,937 (₹15,937 interest). Compound interest yields significantly more over long periods.
How much will ₹1 lakh become in 10 years at 10%?
At 10% annual compounding, ₹1 lakh becomes ₹2.59 lakh in 10 years. At 12%, it becomes ₹3.11 lakh. At 15%, it becomes ₹4.05 lakh. The difference between 10% and 15% over 10 years is substantial - ₹1.46 lakh. Our calculator shows exact projections for any rate and time.
What is the rule of 72 in compound interest?
The Rule of 72 estimates how long to double your money at a given rate. Divide 72 by the interest rate: at 8%, money doubles in 9 years (72/8 = 9). At 12%, it doubles in 6 years. This is a quick mental approximation - our calculator provides exact calculations.
How to maximize compound interest benefits?
Maximize compound interest by: 1) Starting early to maximize time, 2) Choosing higher compounding frequency, 3) Reinvesting all earnings (don't withdraw), 4) Finding higher interest rates, 5) Making regular additional contributions, 6) Being patient - compounding accelerates over time.
What investments use compound interest?
Investments using compound interest: Mutual Funds (SIP reinvestment), PPF (compounded annually), EPF (compounded annually), Fixed Deposits (compounded quarterly), Recurring Deposits (compounded quarterly), Stock dividends reinvested. Most long-term investments benefit from compounding.
How does time affect compound interest?
Time is the most powerful factor in compound interest. ₹10,000 at 10% for 10 years = ₹25,937, for 20 years = ₹67,275, for 30 years = ₹1.74 lakh. The last 10 years (20-30) generate more than the first 20 years combined. Starting early dramatically increases final corpus.
What is continuous compounding?
Continuous compounding is the theoretical limit where interest is compounded infinitely many times per year. Formula: A = Pe^(rt). It yields slightly higher returns than daily compounding but the difference is minimal. Daily compounding is practically equivalent to continuous for most purposes.