Simple Interest Calculator
Calculate simple interest instantly online using principal amount, interest rate and time period.
Last updated: October 2026
Free Online Simple Interest Calculator
Use this free online simple interest calculator tool directly in your browser without installing software. Fast, mobile friendly and easy to use.
Simple Interest Details
Formula Used
About Simple Interest
Simple interest is calculated only on the original principal amount and does not include accumulated interest from previous periods.
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About This Tool
About Simple Interest Calculator
This free online Simple Interest Calculator helps you calculate interest earned or payable on a principal amount using the simple interest formula.
Simple interest is commonly used for short-term loans, fixed deposits and basic financial calculations.
Simple Interest Formula
SI = (P × R × T) / 100
Where:
- P = Principal Amount
- R = Annual Interest Rate
- T = Time Period
Frequently Asked Questions
What is simple interest?
Simple interest is interest calculated only on the original principal amount.
What is the formula for simple interest?
Simple Interest = (Principal × Rate × Time) / 100
What is the difference between simple and compound interest?
Simple interest is calculated only on the principal amount, while compound interest includes accumulated interest.
Is this Simple Interest Calculator free?
Yes. This calculator is completely free to use online.
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