1. What is Simple Interest?

Simple interest is a method of calculating the interest charge on a loan based on the original principal amount, the interest rate, and the time period. It's commonly used for personal loans, short-term loans, and some types of investments.

2. How Does the Calculator Work?

The calculator uses the simple interest formula:

Where:

• \( P \) — Principal amount (original loan amount in USD)
• \( r \) — Annual interest rate (in decimal form)
• \( t \) — Time period (in years)

Explanation: The formula calculates the total interest by multiplying the principal amount by the annual interest rate and the time period in years.

3. Importance of Interest Calculation

Details: Understanding interest calculations helps borrowers estimate the total cost of a loan, compare different loan offers, and make informed financial decisions.

4. Using the Calculator

Tips: Enter the principal amount in USD, annual interest rate as a decimal (e.g., 5% = 0.05), and time period in years. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How is this different from compound interest?
A: Simple interest is calculated only on the original principal, while compound interest is calculated on the principal plus accumulated interest.

Q2: What's the difference between APR and interest rate?
A: APR includes both the interest rate and any additional loan fees, providing a more complete cost picture.

Q3: How do I convert percentage to decimal?
A: Divide the percentage by 100 (e.g., 7.5% = 0.075).

Q4: Can I use this for partial years?
A: Yes, enter fractional years (e.g., 6 months = 0.5 years).

Q5: Does this account for monthly payments?
A: No, this calculates total interest over the full term. For monthly payments, use an amortization calculator.