Compound Interest Calculator - Free Online Interest Calculator

How to Use the Compound Interest Calculator

1. Enter principal — starting amount
2. Set interest rate — annual percentage rate
3. Choose time period — number of years
4. Toggle compounding — simple or compound interest
5. Get results — final balance, total interest, and yearly breakdown

Perfect for investment planning, savings goals, and understanding the power of compounding.

Features

• Simple & Compound — toggle between both modes
• Yearly breakdown — see how your money grows each year
• Real-time — updates as you type
• No data sent — everything runs locally