Interest Basics
How to Calculate Monthly Interest
How to turn an annual rate into a monthly interest amount for savings and loans, including APY conversions and day-count differences.
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Core ideas: principal, interest rates, simple interest and how interest is calculated.
Interest Basics
How Interest Rates Work
What an interest rate really measures, nominal vs effective rates, fixed vs variable rates, what moves rates and how inflation affects real…
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Interest Basics
What Is Principal Amount?
The principal is the amount you invest or borrow before interest. Learn how it differs for savings and loans, and how repayments…
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Interest Basics
Simple Interest vs Compound Interest
A side-by-side comparison of simple and compound interest, with a 30-year table, formulas and guidance on which one applies to your loan…
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Interest Basics
What Is Simple Interest?
Simple interest is charged only on the original amount. Learn the formula, see worked examples for years, months and days, and find…
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