Quick & Easy Interest Calculator
Simple Interest Calculator
Calculate simple interest on any principal amount with rate and time period
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Understanding Simple Interest
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What is Simple Interest?
Simple Interest (SI) is a method of calculating the interest on a principal amount where interest is computed only on the original principal, not on accumulated interest. The formula is SI = (P × R × T) / 100.
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Simple vs Compound Interest
Unlike compound interest where you earn interest on interest, simple interest is calculated only on the original principal. This makes compound interest grow faster over time, while simple interest grows linearly.
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Where Simple Interest Applies
Simple interest is commonly used in car loans, personal loans, consumer installment loans, and some short-term lending. Banks may also use it for certain savings instruments and Treasury bills.