Simple Interest Calculator
Calculate simple interest and total amount from principal, rate, and time.
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Tool guide
Simple Interest Calculator: how it works
Practical information to understand the result and use this tool correctly.
About Simple Interest Calculator
Calculate simple interest and total amount from principal, rate, and time.
The tool runs directly in the browser for immediate results.
How to use it
- 1Enter the values you want to calculate or process.
- 2The result updates instantly on the same page.
- 3Copy, share, or export the result if the tool allows it.
Frequently asked questions
- Do I need to sign up?
- No. The tool works without an account.
- Are my data uploaded?
- Compatible operations run locally in the browser.
- What is simple interest?
- Simple interest is I = P × r × t / 100, where r is the annual rate in percent and t is time in years. Interest is not compounded.
- Can the rate be entered as a decimal?
- Enter the rate as a percentage (e.g. 5 for 5%). The calculator divides by 100.