Simple Interest Calculator
What is Simple Interest?
Simple interest is a quick and easy method to calculate the interest charge on a loan or the earnings on an investment. Unlike compound interest, it is calculated only on the original principal amount. It remains constant each year and is widely used for short-term loans, car loans, and some savings instruments.
Simple Interest Formula
The basic formula to compute simple interest is:
Simple Interest = (P × R × T) / 100
where:
P = Principal amount (initial sum)
R = Annual interest rate (in %)
T = Time period (in years).
If the time is given in months, we convert it to years by dividing by 12.
Example Calculation
Suppose you borrow $2,000 at an annual interest rate of 6% for 4 years. Then:
Simple Interest = (2000 × 6 × 4) / 100 = $480
The total amount to repay = Principal + Interest = $2,480.
How to Use This Calculator
1. Enter the principal amount (the initial amount of money).
2. Enter the annual interest rate (percentage).
3. Input the time period and choose the unit (years or months).
4. Click Calculate Interest to see the simple interest and the total amount.
5. Use Reset to clear all fields.
Frequently Asked Questions
This tool expects the annual interest rate. If you have a monthly rate, multiply it by 12 first. For example, a 0.5% monthly rate becomes 6% annually.
Simple interest is easier to calculate and cheaper for borrowers because interest is not charged on accumulated interest. Compound interest can grow investments faster but makes loans more expensive.
Yes! The calculator is fully responsive and works perfectly on smartphones and tablets.
