Loan Guides
Short, plain-English explainers on how loans really work — the math behind the numbers our calculators give you, with worked examples throughout.
How Loan Amortization Works
A plain-English explanation of loan amortization: how each payment splits between interest and principal, why early payments are mostly interest, and how to read a schedule.
APR vs. Interest Rate
The interest rate is the cost of borrowing the principal. APR adds in fees to show the true annual cost. Here is how they differ and when each one matters.
How to Pay Off a Loan Faster
Practical, math-backed ways to get out of debt sooner: extra principal payments, biweekly schedules, windfalls, refinancing, and the avalanche method.
Is Refinancing Worth It?
Refinancing replaces your loan with a new one. Whether it saves money depends on the rate drop, the closing costs, the new term, and how long you keep the loan.
Why we publish these
A calculator gives you a number. These guides explain where that number comes from, so you can sanity-check a lender's quote, understand your own amortization schedule, and make a borrowing decision with your eyes open. Every guide is written and reviewed by the LoanPayoff.io editorial team and uses the same standard formulas as our 20 calculators.