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Simple Interest Calculator
Quickly compute simple interest using the classic Principal × Rate × Time formula, and see the total amount owed or earned. Ideal for short-term loans and basic interest problems.
Interest
$1,500.00
Total amount
$11,500.00
Formula: Interest = Principal × Rate × Time ÷ 100
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
How is simple interest calculated?＋
Principal multiplied by rate and time. Unlike compound interest, it's charged only on the original principal.
When is simple interest used?＋
For some short-term loans and bonds. Most savings accounts and long-term loans use compound interest instead.
Is my data private?＋
Yes — the calculation runs entirely in your browser.