QuickNEC: NEC Calculator

Fast NEC 2023 calculations for electricians: conduit fill, wire ampacity, voltage drop, and grounding with NEC references. Works offline. No subscriptions.

NEC calculator for electricians. Quickly calculate conduit fill, voltage drop, and wire ampacity using NEC tables.

QuickNEC is a professional National Electrical Code (NEC 2023) calculator and reference tool built for electricians, electrical engineers, and inspectors.

Perform conduit fill, wire ampacity, voltage drop, and grounding calculations in seconds, with clear NEC references designed for real job-site use.

PROFESSIONAL ELECTRICAL CALCULATORS

• Conduit Fill: Calculate fill percentages per NEC Chapter 9
• Wire Ampacity: Full derating with temperature and conductor adjustments
• Voltage Drop: Single-phase and three-phase electrical systems
• Grounding: EGC and GEC sizing per NEC 250.122 and 250.66

NEC-BASED REFERENCE

• Calculations and reference values verified against NFPA 70 (NEC 2023)
• Clear NEC table and article references included with results
• Designed to support field work, inspections, and documentation

QuickNEC is an independent reference tool and is not affiliated with or endorsed by NFPA.

FAST SEARCH AND TABLE BROWSER

• Browse and search NEC reference tables
• Bookmark frequently used tables
• Search within tables for quick lookups

INSPECTOR MODE

• Professional formatting for inspections
• Enhanced NEC references for documentation
• Clear pass and fail indicators

FAVORITES AND SHARING

• Save common calculator configurations
• Quick access to frequently used calculations
• Share results using the iOS share sheet

BUILT FOR THE JOB SITE

• Fully offline, no internet required
• Fast full-text search across NEC content
• Large tap targets and dark mode optimized for field use
• VoiceOver accessible

IMPORTANT NOTICE QuickNEC is provided as a reference tool only. Users must always verify calculations against the official NFPA 70 (National Electrical Code) and applicable local amendments. All electrical work must be performed by licensed professionals in accordance with local codes and regulations.

IDEAL FOR

• Licensed electricians
• Electrical engineers
• Code inspectors
• Electrical contractors
• Apprentices and students
• Job-site quick reference needs

No subscriptions. One-time purchase.