Finance calculator
Simple interest calculator
Interest = principal × annual rate × years. Rate is a percent per year.
Inputs
Enter valid numbers. Calculations run entirely in your browser.
Results
Simple interest
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Principal + interest
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Example
50,000 at 5% for 3 years: interest 7,500; total 57,500.
Explanation
No compounding within the period; for compounding use other tools.
FAQ
Partial year?
Express time as a decimal year (e.g. 0.5 for six months).