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Finance Reference

Interest, amortization, and savings fundamentals that support personal and business finance calculators.

Finance5 minbeginner

Compound Interest Fundamentals

Compound interest earns returns on both principal and accumulated interest. Time, rate, and compounding frequency jointly determine future value.

Finance7 minintermediate

Mortgage Amortization Basics

Amortization spreads loan repayment over time. Early payments apply mostly to interest; later payments apply more to principal on a typical fixed-rate schedule.