Simple
Interest
Compound
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Simple Interest
Simple Interest Calculator
I = P × r × t — quick and clear.
Principal ($)
Annual rate (%)
Time (years)
Total amount
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How to use
Enter principal, annual rate, and years.
Read interest earned and total amount.
Compare with compound interest when needed.
Compound Interest
Loan Calculator
ROI Calculator
Investment
Sites that do this well
1. Calculator.net Simple Interest
calculator.net
2. Compound Interest
toolsonline.cc
3. Omni Simple Interest
omnicalculator.com