NEC Box Fill Calculator
Fast NEC 2026 Calculations
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Free
In-App Purchases
About
The fastest NEC® Box Fill Calculator for professional electricians.
Stop flipping through tables.
Calculate NEC® 2023 box fill instantly with a clean, modern interface designed specifically for electricians.
Whether you're working in residential or commercial installations, NEC Box Fill Calculator helps you verify box capacity quickly and confidently.
Features
• Instant live calculations
• NEC® 2023 compliant calculations
• Visual capacity gauge
• Smart box recommendations
• Common electrical box catalog
• One-handed operation
• Professional Apple-inspired interface
• No ads
• Works offline
Perfect for
• Licensed Electricians
• Electrical Contractors
• Apprentices
• Inspectors
Designed for speed.
Built for professionals.
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What's New in NEC Box Fill Calculator
1.1
August 8, 2026
Significant payment and user experience improvements
Subscription plans
NEC Box Fill Calculator Annual
NEC Box Fill Calculator
$29.991 Year
