Muhammad Adnan is a software engineer based in Karachi, Pakistan, and the founder of TrustTheCalcs. He holds a BE in Software Engineering and is a Registered Engineer with the Pakistan Engineering Council in the software engineering discipline. He builds the calculators and maintains the sourced-data modules behind them. Before a constant ships, it is traced to a named standard (such as CMHA TEK notes or ASTM C90) or to a manufacturer datasheet, and the citation is shown next to the result.