Editorial Policy

This page explains how we decide what to publish, how we verify it, and what we do when we get something wrong. It applies to every calculator, formula, worked example, and article on the Site.

Formula verification

Every calculator's underlying formula is checked against known reference values before it's published — for example, a distance calculator is tested against the known distance between two real cities, a financial formula against a hand-worked example, a physics formula against a textbook result. Non-trivial example numbers shown on a calculator page (anything involving logarithms, square roots, exponents, or a multi-step calculation) are independently computed and checked before being written into the page, not estimated or guessed.

What we won't publish

Where a topic has genuinely inconsistent formulas or conventions across authoritative sources — meaning we can't be confident which one is correct — we don't publish a calculator for it rather than risk giving a plausible-looking wrong answer. We'd rather have a gap in our catalog than a calculator we're not confident in. Where a formula is a widely-used approximation or rule of thumb rather than an exact scientific result (a common example being informal pet-age or wellness-estimate formulas), we say so directly on that calculator's page instead of presenting it as more precise than it is.

Sourcing

Where a calculator is based on a specific published study, standard, or widely-cited formula, we name it directly in that calculator's content or FAQ section rather than presenting it as generic, unsourced knowledge. Standard mathematical and physical formulas (percentages, geometry, basic physics) are treated as established public knowledge and don't require an individual citation.

Independence

Calculator results and content are never influenced by advertisers. The Site may show advertising (see our Privacy Policy), but ad placements are kept structurally separate from calculator results and never appear inside the calculator input/output area itself.

Corrections

If a calculator's formula, example, or explanation turns out to be wrong, we fix it as soon as we're able to confirm the issue — there's no minimum severity threshold or waiting period. If you've spotted something that looks incorrect, please tell us the calculator, your inputs, and what you expected via our Contact page — that's the fastest way for us to reproduce and correct it.

Not professional advice

Every calculator remains a general informational tool, not a substitute for professional advice — see our Disclaimer for the full detail.