⚡
Electrician Calculators
5 free professional-grade tools. Professional electrical calculators for electricians
Wire & Cable
Voltage Drop Calculator
Calculate voltage drop for copper and aluminum wire based on wire size, length, and load current. Uses NEC resistance tables for accurate results.
Open Calculator →
Wire Size Calculator
Determine the minimum wire size (AWG) for your electrical circuit based on load current, distance, and voltage drop requirements per NEC standards.
Open Calculator →
Wire Ampacity Calculator
Look up the allowable ampacity for copper and aluminum wire sizes per NEC Table 310.16, with derating for ambient temperature and conductor fill.
Open Calculator →
Conduit Fill Calculator
Calculate conduit fill percentage and maximum number of conductors per NEC Chapter 9. Supports EMT and PVC conduit with THHN, THWN, and XHHW wire types.
Open Calculator →