How is simple interest calculated?
Learn the simple interest formula and how principal, rate, and time determine the estimate.
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Interest Guides
Understand the figures in a simple-interest estimate and the assumptions behind the calculation.
Monthly rate or yearly rate: what should I enter?
Choose the matching rate period and understand how monthly and annual rates are applied.
Read this guide →Principal, interest, and total amount
Understand what the principal, estimated interest, and total amount mean in a result.
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