These are separate sites, each a reference for a different trade. They work the same way MixRatio does: the calculators run in your browser and there is no account. Each description is the site's own.
- ThreadRefThread and fastener reference for 228+ sizes: metric, Unified and pipe threads with tap drills, clearance holes, torque estimates and wrench sizes.
- SpanRefPublished lumber span tables for floor joists, ceiling joists, rafters and decks, with instant span lookup, a deck calculator and reverse sizing.
- GaugePassFree weld symbol, filler metal, discontinuity and welding math reference, plus practice questions and a gauge trainer for welding inspectors.
- CogoKitFree COGO calculators for land surveyors: horizontal and vertical curves, traverse closure, area by coordinates and bearings, plus FS exam practice.
- EngiRef119 engineering formulas with solvers, 56 materials, 134 unit conversions, constants and reference tables.
- SidewallRefTire size decoder: break a size like 225/65R17 into overall diameter, sidewall height, circumference and revolutions.
- IrrigauditRun a catch-can irrigation audit in the browser: distribution uniformity, precipitation rate, cycle-soak programs and a printable client report.
Looking for something on this site instead? The calculators, the mix ratios and the guides are the places most visitors start.