Compound Interest Calculator
Watch savings grow with compounding — compare rates, tenures and frequencies.
₹1 lakh growing at 8% compounded annually becomes about ₹2.16 lakh in 10 years — and ₹4.66 lakh in 20. That acceleration is compounding: you earn returns on your returns. Time matters more than the rate, which is why starting early beats investing more later.
How to use the compound interest calculator
- Enter your initial investment.
- Set the rate, tenure and compounding frequency.
- Watch the growth curve and compare scenarios.
Compound Interest Calculator — FAQs
What is compound interest?
Interest calculated on both your principal and all previously earned interest. Each period, your base grows — so growth accelerates over time, unlike simple interest which is linear.
How often should interest compound?
More frequent compounding (monthly vs yearly) gives slightly higher returns. The difference is small compared to the rate and tenure, but it’s free money — take it.
What is the rule of 72?
Divide 72 by your annual rate to estimate doubling time: at 8%, money doubles in about 9 years. It’s a quick mental check for any compounding claim.
Simple vs compound interest?
Simple interest pays only on principal; compound pays on principal plus accumulated interest. Over long periods the gap is enormous — always check which one an offer uses.
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