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Borrowing

The mechanics of what credit costs, meaning the difference between an interest rate, an APR, and an APY, how up-front fees and discount points change a comparison, and why two loans advertising the same rate can differ substantially in total cost.

February 27, 2026 · 7 min read

APR, APY, and Interest Rate Are Three Different Numbers

They look interchangeable and are not. One includes fees, one includes compounding, and one includes neither. Confusing them is how a 6.25% mortgage ends up more expensive than a 6.75% one.

Calculators for borrowing

APR CalculatorFind a loan's true annual percentage rate once lender fees and points are folded into the cost.Interest Rate CalculatorWork backward from a loan amount, payment, and term to find the interest rate you're actually paying.Compound Interest CalculatorSee how a lump sum grows with compound interest at any compounding frequency, and what the effective annual yield really is.Loan CalculatorCalculate the monthly payment, total interest, and payoff schedule for any amortized loan personal, student, boat, or business.

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