Voltage Drop Calculator

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.