The Compound Interest Calculator helps you calculate the final amount and interest earned on an investment or loan when interest is added to the principal over time.
Introduction
Compound interest is one of the most important concepts in finance. It helps users understand how money grows when interest is calculated not only on the original principal but also on accumulated interest.
What is Compound Interest?
Compound interest is interest calculated on both the initial principal amount and the interest already earned over previous periods. This makes the total amount grow faster than simple interest over time.
Compound Interest Formula
A = P × (1 + R / 100)T
In this formula, A is the final amount, P is the principal amount, R is the annual interest rate, and T is the time period in years.
Interest Earned Formula
Compound Interest = Final Amount − Principal
After calculating the final amount, the interest earned is found by subtracting the original principal amount from the total amount.
How to Use the Compound Interest Calculator
Enter the principal amount.
Enter the annual interest rate.
Enter the time period in years.
Click the Calculate button.
The final amount and interest earned will appear instantly.
Features of the Compound Interest Calculator
Calculates final compound amount instantly
Shows interest earned separately
Saves recent calculations in browser history
Simple and mobile-friendly interface
Useful for savings, investments and loan planning
Advantages
Helps understand investment growth
Reduces manual calculation errors
Useful for financial planning
Works directly in the browser without installation
Common Uses
Fixed deposit interest calculation
Investment growth estimation
Loan interest understanding
Long-term savings planning
Educational finance calculations
Technologies Used
This calculator is developed using HTML for structure, CSS for design and JavaScript for compound interest calculation, result display and browser-based history storage.