Free Electrical Calculators
NEC-based tools for electricians and electrical contractors. No signup required.
Free online electrical calculators built for working electricians. Every tool follows the latest National Electrical Code (NEC) standards — including Chapter 9 conduit fill tables, Table 310.16 ampacity ratings, and Article 220 load calculation methods. Use them on the job site, in the office, or while putting together a bid. Built by Faraday, the all-in-one management platform for electrical subcontractors.
