Compound Interest Calculator

CI = A − P gives the interest earned.

Albert Einstein reportedly called compound interest the "eighth wonder of the world." Our compound interest calculator helps you see exactly why. Unlike simple interest (which earns returns only on the principal), compound interest earns returns on both the principal AND the accumulated interest — creating exponential growth that accelerates over time.

The difference between monthly and annual compounding is significant. ₹1 lakh at 10% for 10 years with annual compounding gives ₹2.59 lakh. Switch to monthly compounding and you get ₹2.70 lakh — that's ₹11,000 more without investing a single rupee extra. Our online compound interest calculator supports all standard compounding frequencies: monthly, quarterly, half-yearly, and annual.

This tool is essential for evaluating FD maturity values, PPF corpus, NPS projections, lumpsum mutual fund investments, and even credit card debt (where compound interest works against you). Enter any principal amount, interest rate, and tenure to see the growth curve and understand the real power of long-term investing.