**Introduction**

Compound interest is a powerful financial concept that allows you to earn interest not only on your initial investment but also on the interest accrued over time. To make these complex calculations easier, a Compound Interest Calculator comes in handy. In this article, we will provide you with a simple and efficient calculator built with HTML and JavaScript.

**How to Use**

- Enter the principal amount in the designated input field.
- Input the annual interest rate as a percentage.
- Specify the number of years you want to calculate compound interest for.
- Click the “Calculate” button to obtain the result.

**Formula**

The formula for calculating compound interest is given by:

$A=P(1+100r )_{t}$

Where:

- $A$ is the total amount after interest.
- $P$ is the principal amount.
- $r$ is the annual interest rate.
- $t$ is the time in years.

**Example**

Let’s say you invest $1,000 at an annual interest rate of 5% for 3 years. Using the formula, the compound interest would be calculated as follows:

$A=1000(1+1005 )_{3}$

**Result**

The compound interest would be the amount obtained by subtracting the principal from the total amount.

**FAQs**

**Q: Can I leave any input field blank?**

**A:** No, all input fields must be filled for accurate calculations.

**Q: What unit should I use for the principal amount and interest rate?**

**A:** Use the same currency for the principal amount, and express the interest rate as a percentage.

**Q: Why is the result not updating after clicking “Calculate”?**

**A:** Ensure that all input values are numerical, and try again.

**Conclusion**

The Compound Interest Calculator provides a quick and precise way to determine the growth of your investment over time. Utilize this tool wisely for financial planning and decision-making.