Professional Tools

Voltage Drop Calculators

Professional-grade voltage drop calculators for every application. Our tools followNEC 2023 standardsand use resistance values from Chapter 9 Table 8.

Full-Featured Calculators

AC Voltage Drop Calculator

Professional AC calculator with NEC Table 9 values, power factor, and conduit types.

Open Calculator

DC Voltage Drop Calculator

Calculate voltage drop for DC circuits including solar PV and battery systems.

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Wire Size Calculator

Determine the optimal wire size for your application based on load requirements.

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DC Systems

12V

12V Calculator

Automotive, marine, RV, and small solar systems

24V

24V Calculator

Solar arrays, trucks, and industrial controls

48V

48V Calculator

Telecom, data centers, and commercial solar

AC Systems

120V

120V Calculator

Residential branch circuits and lighting

240V

240V Calculator

Dryers, HVAC, EV chargers, and appliances

480V

480V Calculator

Industrial motors and commercial feeders

Quick Wire Sizing Reference

Wire Size	Copper Ampacity	Aluminum Ampacity	Typical Use
14 AWG	15A	-	Lighting circuits
12 AWG	20A	15A	General purpose outlets
10 AWG	30A	25A	Dryers, water heaters
8 AWG	40A	30A	Ranges, EV chargers
6 AWG	55A	40A	Large appliances, subpanels

* Ampacity values based on NEC Table 310.16 at 60°C rating. Always verify withcurrent NEC tables

Additional Resources

Wire Tables

NEC ampacity and resistance data

NEC Standards

Code requirements explained

Calculation Guide

Step-by-step instructions

Examples

Real-world calculation examples

References & Standards

NFPA 70 - National Electrical Code (NEC) - Official NEC standards from NFPA
Copper Development Association - Copper wire specifications and properties
Aluminum Association - Aluminum conductor information
IEEE Standards - Electrical engineering standards