Methodology

1. Content principles

Everything we publish must be educational, comprehensible and non-promotional. We explain mainstream personal finance topics and well-documented concepts. We do not publish investment predictions, price targets, “income proof” screenshots, or advice that depends on our readers’ individual circumstances.

When a topic is genuinely contested — like the reliability of the 4% withdrawal rule, or the future of cryptocurrency — we say that it is contested, rather than pretending there is one answer.

2. How we research

Guides are based on widely used, well-established principles (budgeting frameworks, debt-payoff math, compound interest, index investing) and on reputable public sources where specific claims matter, such as national statistics agencies, regulatory bodies and peer-reviewed finance literature. We avoid relying on a single sensational source. We name the assumptions inside the text when a number depends on them.

3. How calculators work

Every calculator is a small client-side program that runs standard, openly documented formulas. The exact formula is displayed on the tool’s page. Where input is missing or invalid, the tool shows a neutral message rather than a false number. Results are rounded and clearly labelled as estimates.

Each calculator states its assumptions and its limitations — for example, that projected returns are hypothetical and not guaranteed, or that a mortgage estimate excludes taxes and insurance. We never display a result as if it were certain or personalized.

4. Testing

The calculation functions behind our tools are covered by automated unit tests, and every content route is validated at build time. We test edge cases such as zero rates, zero balances and inputs that would otherwise produce errors.

5. Money and independence

This site may earn revenue from display advertising and, later, affiliate links. Revenue never determines which topics we cover, what we write, or how a tool behaves. If a page contains links from which we may benefit, that is stated in our Affiliate Disclosure.

6. Corrections

We consider steady correction part of the job. Each article shows an "Updated" date, and material corrections are noted in the page itself when they matter. If you find an error, tell us — that’s the fastest way to get facts fixed.