Calculators for the panel, the pipe rack and the shop floor
Voltage drop, wire and conduit sizing, bolt torque, beam deflection, pipe friction and more. Every page shows the formula, the code reference and a worked example, so you can check the answer instead of trusting it.
Electrical
Voltage DropVolts and percent lost over a run of wire.Wire SizeGauge for a load, checked for ampacity and drop.Ohm's LawAny two of V, I, R, P → the other two.kW / kVA / AmpsAmps ↔ kW ↔ kVA ↔ hp, 1φ or 3φ.Transformer SizeStandard kVA rating and full-load amps.Conduit FillPercent fill and smallest conduit, THHN.