Simple Interest Calculator
Find simple interest and the total amount for any principal, rate and time, and compare it with compound interest.
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%
years
How to use the Simple Interest Calculator
Enter the principal, the yearly rate and the time in years. Simple interest is charged only on the original amount, never on interest already earned.
Frequently asked questions
What is the simple interest formula?
SI = P × R × T ÷ 100, where P is the principal, R the rate per year in percent and T the time in years.
How do I use months instead of years?
Divide the months by 12: 18 months is 1.5 years.
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