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Free Simple Interest Calculator Online
Free Simple Interest Calculator Online is a free online tool by US AI. Compute simple interest and total payable with the classic P×R×T/100 formula. It runs completely in your browser — no signup, no download, works on mobile and desktop.
📖 How to use
- Enter principal, annual rate and time in years — results are instant.
- Open the tool with the button above — it loads instantly.
- Your work stays on your device; nothing is uploaded anywhere.
✨ Why use this tool?
US AI's free simple interest calculator is fast, private and 100% free forever. Bookmark this page and share it with anyone who needs it.
❓ Frequently asked questions
Simple vs compound interest?
Simple interest is charged only on the original principal. Compound interest also charges interest on accumulated interest — so it grows faster.
When is simple interest used?
Short-term loans, some deposits and school math problems commonly use simple interest.
Is my data private?
Yes — everything stays in your browser. Nothing is uploaded or stored.