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Cheat SheetFree • Printable
Electrical Cheat Sheets
Quick reference tables for wire sizing, voltage drop, Ohm's law, three-phase power and motor current, with worked examples.
Electrical and Electronics Quick Reference Tables
Short, printable tables for the lookups you repeat all the time. Each sheet explains how to read it, gives a worked example and links to the matching calculator when you need an exact answer for your own case.
AWG Wire Gauge TableDiameter, area, resistance and NEC ampacity for AWG 18 to 4/0, with metric sizes
Voltage Drop Quick TableMaximum cable length for 3% drop at 12 V DC and 230 V AC
Ohm’s Law Formula ChartAll 12 forms of V, I, R, P with series and parallel formulas
Three-Phase Power FormulaskW, kVA and line current, with 400 V and 415 V lookup tables
Motor Full-Load Current TableNEC 430.250 amps for 0.5 to 200 HP, plus a 400 V estimate
Resistor Color Code GuideRead 4, 5 and 6 band resistors
All ElectroLab Calculators96 calculators and repair guides
Reference values only. Always follow your local electrical code and have installations checked by a qualified person.