Compound Interest Calculator
Use this free online tool to get instant results. Fast, secure, and easy to use.
How to Use Compound Interest Calculator
1
Enter Principal Amount
Input your initial investment or loan amount. This is the starting balance that will grow over time.
2
Set Interest Rate & Duration
Enter annual interest rate (e.g., 8% for investments, 12% for loans) and time period in years.
3
Choose Compounding Frequency
Select how often interest is compounded: yearly, half-yearly, quarterly, monthly, or daily. More frequent = more growth.
4
Add Regular Contributions (Optional)
Include monthly or yearly deposits for SIP/mutual fund calculations. See massive difference with regular investing.
💰 The Power of Compounding
- ₹1 lakh at 12% for 10 years = ₹3.11 lakhs (3×)
- ₹1 lakh at 12% for 20 years = ₹9.65 lakhs (10×)
- ₹1 lakh at 12% for 30 years = ₹29.96 lakhs (30×)
- Starting early beats investing more later!
Frequently Asked Questions
What's the difference between simple and compound interest?
Simple interest earns only on principal (₹1000 at 10% = ₹100/year always). Compound interest earns on principal + accumulated interest (Year 1: ₹100, Year 2: ₹110, Year 3: ₹121). Compounding creates exponential growth.
How does compounding frequency affect returns?
More frequent compounding = slightly higher returns. ₹1 lakh at 10% for 1 year: Yearly = ₹1,10,000, Half-yearly = ₹1,10,250, Quarterly = ₹1,10,381, Monthly = ₹1,10,471, Daily = ₹1,10,516. Difference grows with time.
What is CAGR and how is it different?
CAGR (Compound Annual Growth Rate) is the mean annual growth rate of an investment over a period. It's the "smoothed" rate that would give the same final amount. Use our CAGR calculator for irregular investment returns.
Should I use this for loans or investments?
Both! For investments, it shows growth potential. For loans, it reveals total interest you'll pay. Credit cards use daily compounding - that's why debt grows so fast. Always check compounding frequency before borrowing.
Is this calculator accurate for real investments?
Mathematically accurate based on inputs. Real investments have variable returns, fees, taxes, and inflation. Use this for estimation and planning, but consult financial advisors for actual investment decisions.