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Calculate simple interest and the maturity amount from principal, rate and time.
About this tool
Calculate simple interest and the maturity amount from principal, rate and time.
Simple Interest Calculator is a free finance tool that runs entirely in your browser — nothing to install, no account to create, and your data never leaves your device. Open the page, add your input, and get a clean, copy-ready result in seconds.
Open Simple Interest Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Enter what you know and see an accurate result immediately — no formulas or spreadsheets required.
Adjust the inputs to see exactly how each change affects the outcome before you decide.
Take a clear, precise number into your plans, reports, or conversations.
Yes — Simple Interest Calculator is completely free on AltFTool, with no signup, no trial limits, and no hidden costs.
Yes. Simple Interest Calculator runs in your browser, so what you enter or upload stays on your device instead of being sent to a server.
Calculate simple interest and the maturity amount from principal, rate and time. It's built for quick, everyday finance tasks with results you can copy or download straight away.
Yes — Simple Interest Calculator works in any modern browser, on desktop, tablet, and mobile, with the same features everywhere.