Finance Tools
Simple Interest Calculator
Simple interest calculator — compute interest earned or owed on principal over time without compounding.
About this tool
The Simple Interest Calculator applies the classic I = PRT formula to compute interest earned or paid on a principal amount over a defined period. Short-term loans, informal lending agreements, basic savings estimates, and educational finance exercises commonly use simple interest rather than compounding.
Enter the principal, annual rate, and time period, then click Calculate to see both the interest amount and total payable instantly.
For long-term investments where interest compounds over time, switch to the compound interest calculator. To evaluate full loan repayment schedules, use the loan calculator.
How to Use This Tool
- Enter principal, rate, and time.
- Click calculate.
- View interest and total amount.
Frequently Asked Questions
What is simple interest?
Simple interest is calculated only on the original principal amount and does not compound over time.
When should I use a simple interest calculator?
It is best used for short-term loans, basic savings, classroom examples, or agreements where interest does not compound.
Is this suitable for bank loans?
Most bank loans use compound interest. This calculator is best for scenarios where simple interest is explicitly applied.
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