Simple Interest Calculator
Calculate simple interest on a principal over a period of time.
Result
Results are estimates for general information only and are not professional advice.
Simple interest explained
Simple interest is calculated only on the original principal, using I = P × r × t. It is common for short-term loans and some fixed deposits. This calculator returns the interest earned and the final balance.
Frequently Asked Questions
What is the Simple Interest Calculator?
Calculate simple interest on a principal over a period of time. It runs instantly in your browser and is completely free.
Is the Simple Interest Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Simple Interest Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.