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Simple Interest Calculator

Calculate simple interest — interest charged only on the original principal.

Principal($)

Annual rate(%)

Time(years)

Results update automatically as you type.

Interest

$600.00

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How this is calculated

P is principal, r is the annual rate (as a decimal), and t is time in years.

I = P × r × t

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Simple interest ignores interest on interest; compound interest reinvests it.

See how investments grow with compounding over time.

Calculate monthly payments and total interest for any fixed-rate loan.

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