Technical Reviewer
M Bilal
M Bilal holds a bachelor's degree and reviews the formulas, reference tables and worked examples on this site before they are published.
Every calculator is checked by M Bilal against hand-worked examples, unit conversions and edge cases (zero, very large and metric inputs) before release, and again whenever a formula or reference table changes.
Found an error? Tell us. Corrections are made quickly and noted on the page.