About ElecCalc

ElecCalc provides 55+ free, professional-grade electrical calculators designed for electricians, electrical engineers, contractors, and homeowners.

Every calculator is built with accuracy in mind, referencing the National Electrical Code (NEC) 2023 where applicable. Our wire sizing tools use NEC Table 310.16 ampacity values, our conduit fill calculator follows NEC Chapter 9, and our circuit breaker sizing applies the 125% continuous load rule from NEC 210.20.

We believe professional electrical tools should be free, fast, and accessible on any device. Whether you are sizing wire at a job site on your phone or calculating a residential service load at your desk, ElecCalc is built to work anywhere.

Disclaimer

ElecCalc tools are for reference and educational purposes only. All electrical work should be performed by or verified by a licensed electrician. Local codes may differ from NEC. ElecCalc is not responsible for any errors or consequences resulting from use of these calculators.