Free Compound Interest Calculator — See How Your Money Grows

Albert Einstein reportedly called compound interest the eighth wonder of the world. Whether or not he said it, the maths is undeniable.

A ₹1,00,000 deposit at 8% simple interest for 10 years earns ₹80,000. The same deposit at 8% compound interest (yearly) earns ₹1,15,892.

The Tools.Town Compound Interest Calculator shows you exactly how the difference stacks up — year by year.

Enter your:

• Principal — the starting amount
• Annual rate — percentage per year
• Compounding frequency — daily, monthly, quarterly, half-yearly, or yearly
• Tenure — in years

You get: final amount, total interest earned, and a year-by-year table showing the compounding effect in action.

Frequently Asked Questions

What is compound interest? Compound interest is interest earned on both the original principal and the accumulated interest from previous periods. It causes exponential growth over time.

What compounding frequencies are supported? Daily, monthly, quarterly, half-yearly, and yearly.

How is it different from simple interest? Simple interest calculates interest only on the principal. Compound interest recalculates on the growing balance — so interest earns interest.

Is this useful for FD calculations? Yes — most Fixed Deposits compound quarterly. Set the frequency to quarterly and enter your FD tenure to see the maturity amount.

Try it now — Open Compound Interest Calculator — no signup required.