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Simple Interest Calculator
Compute interest using I = P × r × t (no compounding). Used for short-term consumer loans, T-bills, and savings without compounding.
FINANCECompute simple interest (I = P × r × t) with no compounding effect, plus the total amount due (P + I) and a side-by-side comparison against compound interest for the same period.
Simple interest is rare in modern finance — it shows up in short-term consumer loans (some payday and title loans, T-bills) and in homework problems. Most savings, credit cards, and mortgages use compound interest. The longer the period and higher the rate, the more dramatically compound beats simple.
Disclaimer: Check your loan or savings agreement for the actual interest method (simple, compound monthly, compound daily, continuous).
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Frequently Asked Questions
What is the Simple Interest Calculator for?
Compute simple interest (I = P × r × t) with no compounding effect, plus the total amount due (P + I) and a side-by-side comparison against compound interest for the same period.
How do I use the Simple Interest Calculator?
Simple interest is rare in modern finance — it shows up in short-term consumer loans (some payday and title loans, T-bills) and in homework problems. Most savings, credit cards, and mortgages use compound interest. The longer the period and higher the rate, the more dramatically compound beats simple.
How accurate are my simple interest results?
Check your loan or savings agreement for the actual interest method (simple, compound monthly, compound daily, continuous).
Is the Simple Interest Calculator free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.
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