Compound Interest Calculator: Grow Your Wealth Faster

What Is Compound Interest?

Compound interest is interest earned on your earlier interest. Instead of earning only on your original amount, every period adds new interest to your balance, and the next period earns interest on the bigger total.

This is why India's most popular investment products — PPF, EPF, mutual funds, and fixed deposits with reinvestment — grow money so powerfully over long periods.

A = P × (1 + r/n)^(n×t)

Where P is principal, r is the annual interest rate, n is the number of compounding periods per year, and t is the time in years. A compound interest calculator applies this formula for you instantly.

Why Compounding Is Called the Eighth Wonder

The effect is dramatic over time. Consider ₹1,00,000 at 7% per year:

Years	Simple Interest	Compound Interest (yearly)
5	₹1,35,000	₹1,40,255
10	₹1,70,000	₹1,96,715
20	₹2,40,000	₹3,86,968
30	₹3,10,000	₹7,61,226

After 30 years, compounding grows your money to more than double what simple interest produces — without you adding a single rupee more.

How to Use the Compound Interest Calculator

The compound interest calculator asks for:

1. Principal amount — what you invest today.
2. Annual interest rate — for example, 7.1% for PPF or 8.2% for EPF.
3. Time period — in years.
4. Compounding frequency — annually, half-yearly, quarterly, or monthly.

The result shows your maturity value and the total interest earned, so you can compare products side by side on the compound interest calculator.

Real Products Where This Applies in India

• PPF — 7.1% per annum, compounded yearly, tax-free.
• EPF — 8.25% per annum for 2025-26, often the backbone of an employee's retirement fund.
• Fixed deposits — many banks compound quarterly, which adds meaningful growth.
• Mutual funds and SIPs — returns compound on your entire fund value year after year.

Check your own EPF growth with our EPF interest calculator and compare it against other options.

Simple Interest vs Compound Interest

Use the simple interest calculator when interest stays flat (like personal loans between friends), and compound interest when you want wealth to build. Comparing the two with real numbers makes the difference unforgettable:

On ₹5,00,000 over 15 years at 8%, simple interest gives ₹11,00,000 — compounded yearly gives roughly ₹15,86,000.

Frequently Asked Questions

• Does compounding happen daily for my bank savings? Savings accounts pay interest on the daily balance but credit it monthly or quarterly — our monthly option matches this closely.
• What compounding frequency is best? More frequent compounding earns more for the same rate, which is why quarterly FDs beat annual ones.
• Is the calculator free? Yes, the compound interest calculator is completely free.

Start early, stay invested, and let compounding do the heavy lifting. Run your numbers on the free compound interest calculator.