Guides

The math behind every calculator on this site, explained step by step. Each guide shows the formula, a worked example and the assumptions that change the answer.

Debt strategy Debt Consolidation vs. the Avalanche Method: How to Compare Them Fairly When a consolidation loan beats paying cards off one by one, and when it does not. A side-by-side example with fees, rates and the same monthly budget. Oct 22, 2026 · 10 min read
Loans & mortgages How Amortization Schedules Work (and Why Early Payments Are Mostly Interest) Read any loan schedule line by line: how each payment splits into interest and principal, why the split shifts over time, and what extra payments really do. Oct 22, 2026 · 9 min read
Credit cards Understanding APR and Daily Interest on Credit Cards How card issuers turn an annual rate into the interest on your statement: daily periodic rate, average daily balance, grace periods and the real annual cost. Oct 22, 2026 · 9 min read

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