Conversion Methodology

Last updated: May 4, 2026

UnitOwl is built to give fast answers, but the answer is only useful if the conversion factor, formula, and context are correct. This page explains how we choose sources, calculate results, and review content before it appears on the site.

Primary Sources

Standard physical unit conversions are verified against references from the National Institute of Standards and Technology (NIST), the International Bureau of Weights and Measures (BIPM), SI documentation, ISO/IEC standards, and domain-specific standards bodies where appropriate.

Currency conversions use European Central Bank reference rates through the Frankfurter API. Currency pages identify the rate source and note that market rates, card network rates, and transfer-service rates can differ.

Calculation Rules

Linear conversions are calculated through shared TypeScript conversion modules rather than hand-written page text. Formula-based conversions, such as Celsius to Fahrenheit, use category-specific functions so offset units are not treated as simple multipliers.

Results are rounded for readability, while source factors remain more precise in the conversion engine. Where practical, pages include a formula, a quick-reference table, real-world examples, and common mistakes so users can check whether a result is reasonable.

Editorial Review

Pages are reviewed for mathematical correctness, source alignment, clarity, and practical usefulness. We avoid publishing pages whose only purpose is to swap a number into a template. When a topic needs more context, the page should explain when the conversion is useful, what assumptions apply, and what mistakes would change the answer.

Medical, health, and financial calculators require extra caution. They are informational references, not professional advice, and are reviewed with appropriate disclaimers before being made prominent.

Updates and Corrections

Static unit definitions rarely change, but source links, currency data, browser behavior, and calculator guidance can. If we materially update a page, we update its visible review date. We do not change dates simply to make pages appear fresh.

To report a possible error, send the page URL, the value you entered, the expected result, and your source to [email protected].