Simple interest applies a rate to the original principal for a specified time.
Simple Interest Calculator
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Table of Contents
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What is Simple Interest ?
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How to Use This Calculator
- Enter or select Preincipal Amount, Rate of Interest (%), Time (years).
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
I = P × r × t; final amount = P+I
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Variables Explained
| Input | What it means |
|---|---|
| Preincipal Amount | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Rate of Interest (%) | The stated rate or percentage, entered using the scale and time period shown in the form. |
| Time (years) | Elapsed time or duration in the unit selected on the form. |
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Worked Example
Principal 1,000 at 5% for 3 years earns 150 simple interest.
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Why Use This Calculator?
Compare the result with the underlying statement, budget or proposed transaction. It is most useful when every amount uses the same reporting period and the same accounting definition.
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Common Mistakes
- Use years when the rate is annual; simple interest does not earn interest on earlier interest.
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Frequently Asked Questions
Should I use monthly or annual figures?
Use one consistent period for every amount and rate in the relationship. If a form specifies an annual rate or a monthly amount, follow that label rather than mixing time periods.
Does the result include fees and tax?
Only the costs and taxes represented by the inputs and formula are included. A real transaction can include other charges, so compare the estimate with the underlying agreement or statement.
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Sources & References
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