Understand the power of compounding. Calculate how your wealth grows when interest earns interest over long periods.
Compounding is the process where the value of an investment increases because the earnings on an investment, both principal and interest, earn interest as time passes. This effect snowballs over long periods.
The most important factor in compound interest is not the amount of money you start with, but the amount of time you give it to grow. Starting just 5 years earlier can result in a significantly larger corpus at retirement.
Albert Einstein famously called compound interest the "eighth wonder of the world." Our Compound Interest Calculator helps you visualize why. Unlike simple interest, which is calculated only on the principal amount, compound interest is calculated on the principal PLUS the accumulated interest from previous periods. This creates a snowball effect that can turn modest savings into a massive corpus over time.
A = Final Amount, P = Principal, r = Annual rate, n = Compounding frequency, t = Time in years
In simple interest, your returns are linear. If you invest ₹1 Lakh at 10%, you earn ₹10,000 every year. In 10 years, you have ₹2 Lakhs. With Compound Interest (compounded annually), your interest earns interest. In year 2, you earn 10% on ₹1.1 Lakhs. By year 10, your ₹1 Lakh grows to approximately ₹2.59 Lakhs. The longer you stay invested, the steeper the growth curve becomes.
How often interest is added to your account matters. Most Indian bank FDs use Quarterly Compounding, while many government schemes like PPF use Annual Compounding. The more frequent the compounding (e.g., daily vs. yearly), the higher your final maturity value. Our tool allows you to see how these subtle differences impact your final wealth.
The magic of compounding requires two things: Reinvestment and Time. If you start investing ₹10,000 a month at age 25, you will have significantly more at retirement than someone who starts at age 35, even if they invest double the amount. This is because the early investor gives their money an extra decade to compound.
Government-backed schemes like the Public Provident Fund (PPF) and Sukanya Samriddhi Yojana (SSY) are excellent examples of compound interest in action. These schemes offer competitive interest rates that are compounded annually, providing a safe and tax-efficient way to build a retirement or education fund over 15-21 years.
Investing ₹5 Lakhs once and leaving it for 20 years at 10% p.a.
₹1 Lakh at 12% p.a. for 1 year with different compounding.
It's a quick way to estimate how long it takes to double your money. Divide 72 by your interest rate (e.g., 72 / 8% = 9 years).
No. PPF interest is calculated monthly (on the lowest balance between the 5th and last day) but is compounded annually on March 31st.
APR is the nominal rate. APY (Annual Percentage Yield) is the actual rate you earn after compounding is factored in.
In most cases, yes. Interest from FDs and NSCs is taxable. However, schemes like PPF are tax-free.
For SIPs, use our dedicated SIP Calculator, as it handles recurring monthly investments whereas this tool is for lumpsum amounts.
Inflation is like 'reverse compounding'. It eats your purchasing power. Aim for a return rate that is at least 3-4% above inflation.
It is the mathematical limit of compounding frequency. It uses the constant 'e' and is mostly used in complex financial modeling.
Because the interest earned is based on a small principal. As the corpus grows, the interest earned each period becomes significantly larger.
Use the formula A = P(1+r/n)^nt. Or just use our free online tool for instant, accurate results!
For savers and investors, yes! For borrowers, simple interest is generally cheaper.