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Simple Interest Calculator
Interest without compounding, made simple.
Final amount
$5,750.00
Interest earned
$750.00
About the Simple Interest Calculator
Free simple interest calculator. Enter the principal, rate and time to find the interest earned and the final amount, with no compounding.
Everything is calculated instantly in your browser — nothing you type is uploaded or stored. Bookmark Calcooly for the next time you need it.
How to use the Simple Interest Calculator
- 1Enter the principal amount.
- 2Set the annual interest rate and time in years.
- 3See the interest earned and the final amount.
Frequently asked questions
How is simple interest different from compound?+
Simple interest is calculated only on the original principal, so it doesn't grow on previously earned interest the way compound interest does.
What's the formula?+
Interest = principal × rate × time ÷ 100, added to the principal for the final amount.
Is the result exact?+
It's a reliable estimate for general information. For important financial, medical or legal decisions, check with a qualified professional.