Formula first
Calculator pages show the formula or dosing assumption behind the result when the math can be explained clearly.
Editorial policy
How calculator content is written, checked, and updated.
Source checks
Safety and public-health language is checked against public sources such as CDC materials and manufacturer documentation where relevant.
No fake credentials
The site does not claim professional certification it does not have. It labels results as estimates and points users back to labels and manuals.
Update cadence
Core calculator formulas and source links are reviewed after adding new tools, changing formulas, or finding newer manufacturer guidance.