Editorial policy

A calculator that produces a wrong number is worse than no calculator at all, because it is trusted. Every formula is checked against accepted financial mathematics before publication and covered by automated tests. Reported errors take priority over new features and new calculators.

Content on this site is informational. It explains what a calculation does, why the relationship holds, and what the result means arithmetically. It does not tell you what to trade, what to buy, how much to risk, or what any market will do.

This shapes the language deliberately. Pages say “this calculator estimates” rather than “you should”. Where a page discusses a figure people often ask about — what risk percentage to use, what profit factor is acceptable — it explains the trade-off and declines to name a number, because the right answer depends on circumstances the site knows nothing about.

We do not describe this site or its tools as the best, the most accurate, or number one, because those claims cannot be substantiated. We do not promise profits, describe any approach as safe or guaranteed, or imply that a positive expectancy means future gains.

Where a calculation carries genuine uncertainty, the page says so. Expectancy measured over twenty trades is described as weak evidence, because it is.

Every calculator page has a section stating what the calculation does not account for. It appears in the main flow of the page, not in small print. If a calculator excludes spread, commission, slippage or tax, that is stated plainly where a reader will see it.

No calculator recommends a broker, platform or product, and there are no affiliate links to any financial service. Adverts are labelled, placed away from calculator controls and results, and never styled to resemble a result or a navigation element.

Explanatory content is written for this site rather than assembled from elsewhere. Formulas are standard and attributed as such — we do not claim authorship of mathematics that predates us — while the explanations, worked examples and limitations are original.

We do not fabricate author credentials, invent expert reviewers, or publish ratings and reviews that do not exist. The structured data on each page reflects only what is genuinely on it.

Each calculator carries a visible “last reviewed” date. A review confirms the formula still reflects accepted practice, the worked example reconciles with the calculator’s own output, the stated limitations remain accurate, and the language still avoids advice.

When an error is found, it is fixed promptly and the review date updated. Where a correction changes a result materially, the change is noted on the page rather than made silently.

To report an error, use the contact page and include the calculator, the values you entered, and the result you expected. See also the methodology.