Resource Library

The textbooks, standards, and primary sources we lean on when building calculators. Useful if you want to dig deeper into a formula or verify one yourself.

Standards bodies

• NIST — physical constants, measurement standards
• ISO — international engineering and conversion standards
• WHO — public health reference data
• BIPM — the SI brochure (units of measurement)

Open knowledge bases

• Wikipedia — starting point, verified against primary sources
• MathWorld — Wolfram's math encyclopedia
• NIST CODATA — fundamental physical constants

Specialised sources by domain

• Medical: MDCalc, UpToDate, NICE guidelines
• Finance: CFA Institute reference texts, Damodaran's valuation library
• Construction: NFPA codes, ACI / Eurocode standards
• Statistics: Wasserman's All of Statistics, Hastie's ESL