Shop math and conversionsAll tradesFraction to decimal to mm chart, unit conversions for length, pressure, torque and temperature, right-triangle trig, area, volume and percent, with quick calculators.Speeds and feedsMachinist, MillwrightRPM from cutting speed (imperial CS × 4 ÷ D, metric CS × 1000 ÷ πD), typical HSS cutting speeds and milling feed rate, with calculators.Tap drill chartMachinist, MillwrightTap drill sizes for common UNC, UNF and metric coarse threads (about 75% thread), plus the tap drill formula and a calculator.Pulleys, gears and beltsMillwright, MachinistPulley and gear speed formulas (D1 × N1 = D2 × N2), drive ratio and open-belt length, with calculators.Shaft alignment basicsMillwrightShaft alignment basics for pumps and motors: offset and angular misalignment, soft foot, rim and face dial readings, and correction by similar triangles.Bolts, torque and fitsMillwright, Machinist, Heavy Equipment TechnicianSAE Grade 2, 5 and 8 and metric 8.8, 10.9 and 12.9 bolt markings and strengths, the T = K × D × F torque relationship, and fits and tolerances basics.Rigging and hydraulicsMillwright, Ironworker, Crane OperatorSling angle load factors and load per leg (load ÷ (legs × sin angle)), basic hitch capacities, steel weight estimates and hydraulic cylinder force (F = P × A).Electrical formulasConstruction Electrician, Industrial ElectricianOhm's law and the power wheel, series and parallel resistance, voltage drop from conductor resistance, single- and three-phase power and transformer ratios, with calculators.Conduit bending basicsConstruction Electrician, Industrial ElectricianConduit offset multipliers and shrink by bend angle, 3-point saddle marks and an offset calculator for EMT and rigid conduit.Kitchen math and food safetyCookRecipe scaling factor, yield percentage and edible-portion cost, °C and °F, volume and weight notes, baker's percentage, and danger-zone and cooling rules for cooks.Carpentry, pipe and weld basicsCarpenter, Plumber, Steamfitter/Pipefitter, WelderStair rise and run, rafter length by Pythagoras, board feet, rolling offsets, pipe grade and slope, and the parts of a weld symbol, with calculators.
Sign up with your email to unlock every chart, formula and calculator. No payment needed. Anyone can see each page's topics.
⚠️ Reference only. Always verify against the manufacturer's specs, your jurisdiction's code and your site's procedures.