Simple Interest Calculator
Calculate simple interest and the total amount from principal, rate, and time.
About this tool
Simple interest is charged only on the original principal — the interest itself never earns more interest. It is the method behind many short-term loans and some fixed deposits.
Enter the principal, the annual rate, and the time in years, and the tool returns both the interest earned and the final amount in one step.
How to use
- Enter the principal amount.
- Enter the annual interest rate.
- Enter the time period in years.
- Read the interest and the total amount.
Frequently asked questions
Related tools
Percentage Calculator
Find X% of Y, what percent X is of Y, and percentage change — free and instant.
Percentage Increase Calculator
Enter old and new values to get the percentage increase plus the raw difference.
Percentage Decrease Calculator
Compute the percentage decrease between two values with the exact difference shown.
Age Calculator
Enter your date of birth to get your exact age in years, months, days — plus your next birthday.
BMI Calculator
Enter height and weight (metric or imperial) for your BMI, category, and healthy range.