About the Simple Interest Calculator
Find the simple interest and total amount on a principal for a number of years. This tool is free, works in your browser and needs no sign-up.
How to use the Simple Interest Calculator
Enter the principal, the yearly interest rate and the time in years.
Formula used
Simple interest = P × r × t ÷ 100.
Example
10,000 at 5% for 3 years earns 1,500 in interest.
Frequently asked questions
Is the Simple Interest Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Simple Interest Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.