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Voltage drop calculator: wire size, ampacity, conduit fill, NEC tools.
VoltDrop Pro is the voltage drop calculator built for electricians, apprentices, and contractors who need fast, code-aware answers on the job site. Calculate voltage drop in volts and percent with the NEC 3%/5% verdict, size conductors per NEC 310.16, check ampacity with temperature correction and derating, verify conduit fill per NEC Chapter 9, lay out conduit bends, and solve Ohm's Law in one tap. 6 PRO TOOLS - Voltage Drop Calculator: volts, percent drop, and wire size recommendation with NEC verdict - Wire Size Calculator: the right copper or aluminum conductor for your load - Ampacity Calculator: safe current limits with ambient temperature correction and bundling derating - Conduit Fill Calculator: fill percent and max wire count per NEC Chapter 9 - Conduit Bending Calculator: 3-point saddles, offsets, and rolling offsets with bend marks - Ohm's Law Solver: solve volts, amps, ohms, and watts instantly BUILT FOR THE JOB SITE - 100% offline: works in basements, rooftops, and new construction with no signal - Zero ads, no account, no tracking - NEC 2023 reference tables built in - English and Spanish - Save calculations to jobs and export professional PDF reports Whether you are pulling wire, sizing a feeder, or double-checking a panel schedule, VoltDrop Pro gives you verified electrical calculations in seconds. Download VoltDrop Pro, the electrician's voltage drop calculator and NEC toolkit.