Our Methodology
Apex Conversion is committed to providing accurate, trustworthy conversion data and educational content. This page explains exactly how we create, validate, and maintain every formula, calculator, chart, and article on the site.
How We Create Conversion Data
Formula Validation
Every conversion formula is sourced from internationally recognized standards bodies — primarily the International System of Units (SI) as published by the BIPM (Bureau International des Poids et Mesures) and the U.S. National Institute of Standards and Technology (NIST). Before any formula is published, it is cross-checked against at least two independent authoritative references and tested with known benchmark values.
Unit Definition Validation
Unit definitions are verified against official international standards. For SI base units, we reference the current SI Brochure. For traditional or domain-specific units (e.g., cooking measurements, shoe sizes, clothing sizes), we reference the relevant standards organizations such as ASTM International and ISO.
Standard Reference Verification
For categories where official standards differ by region (e.g., US customary vs. metric cooking, US vs. UK vs. EU shoe sizing), we document each variant separately and clearly label which standard applies. References for each category are listed on our References page.
Calculator Methodology
Formula Testing
Each calculator is tested against published reference values before launch. For financial calculators (mortgage, compound interest, retirement), results are verified against established financial formulas and compared against multiple independent calculators to confirm consistency.
Known Edge Cases
Calculators are tested across the full range of valid inputs, including edge cases such as zero values, very large numbers, and boundary conditions. Where a formula produces undefined results (e.g., division by zero), the calculator displays a clear error message rather than a misleading numeric output.
Rounding Standards
Results are rounded to a level of precision appropriate for the use case. Everyday conversions (e.g., temperature, cooking) display 1–2 decimal places. Scientific and engineering conversions display additional significant figures where precision matters. Rounding uses standard half-up (round-half-away-from-zero) rules unless otherwise noted.
Editorial Process
1. Research
Topic selection is based on search demand, user questions, and gaps in existing explanatory content. Before writing begins, primary sources are gathered: official standards documents, government publications, and academic references. Sources are evaluated for authority, currency, and relevance.
2. Drafting
Content is drafted with accuracy and clarity as the primary goals. All factual claims are tied to specific sources. Formulas are stated precisely. Examples use round numbers drawn from real-world scenarios to aid comprehension.
3. Technical Review
Every published formula and numeric claim is checked a second time before publication. Mathematical formulas are verified by working through example calculations manually. Articles citing regulatory or financial data (e.g., IRS limits, tax brackets) are verified against the current-year official publication.
4. Publication
Articles are published with a publish date and a reviewed date. The reviewed date reflects the most recent date on which the content was verified for accuracy. Pages that contain time-sensitive data (e.g., tax brackets, contribution limits) are flagged for annual review.
Content Updates
Reviewed Dates
Each article displays a “Reviewed” date indicating when the content was last verified. This is distinct from the original publish date. When an article is updated for accuracy or to reflect new standards, the reviewed date is updated to reflect that verification.
Update Process
Content is reviewed on a rolling schedule. Time-sensitive content (financial limits, regulatory data, time zone rules) is reviewed annually or when an official update is published. Evergreen content (physical conversion formulas, mathematical concepts) is reviewed less frequently, as the underlying data rarely changes. When an error is identified — whether internally or reported by a user — the affected content is corrected and the reviewed date is updated.
Source Standards
All authoritative references used across our content are documented on our References page. These include standards bodies (NIST, BIPM, IANA), government sources (IRS, Federal Reserve, CDC, WHO), and domain-specific organizations (ASTM, ISO, USDA). We do not accept sponsored content or paid placements in our editorial content.
Disclaimer
All content on Apex Conversion is provided for educational and informational purposes only. While we work diligently to ensure accuracy, our tools are not a substitute for professional advice. For professional, medical, engineering, legal, or safety-critical applications, always verify results with a qualified professional or certified reference source.
See our full Disclaimer for additional details.
Questions or Corrections
If you believe you have found an error or have a question about our methodology, please contact us. We take accuracy seriously and investigate all reported issues.