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Ready Reckoner · · data reviewed
Values are standard reference data assembled for quick field use. Structural, electrical, plumbing, and safety-critical work follows local code and professional judgment, not this file.
About & data sourcing

Confidence tiers: Tier A exact/definitional (unit conversions, geometry, Ohm's law). Tier B a cited published standard or code table. Tier C guidance/rule-of-thumb -- always shown with a warning banner.

Sourcing hierarchy: defining standard > adopted code/national standard > manufacturer/industry table > textbook/handbook consensus > common trade rule of thumb (Tier C, always labeled).

This tool does not cover: medication dosing, diagnostic medicine, ballistics/reloading data, chemical application rates, structural sign-off, annually-changing legal/tax figures, or live data.

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