NEC Box Fill Calc

Catch Overfilled Boxes Early

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Run every single-box check free. Unlock one Rough-In Box Schedule to label up to 30 checks, put corrections first, and share or export the handoff. NEC Box Fill Calc gives electricians a complete NEC 314.16(B) single-box field check at no charge. When a job spans multiple boxes, the existing Rough-In Schedule keeps labels and corrections together for a shareable handoff. Free field check: - Add conductors by gauge from 18 AWG through 6 AWG - Count grounding conductors, internal clamps, support fittings, and devices correctly - See total fill, pass/fail status, line-by-line breakdown, and the smallest listed standard box that fits - Switch between 20 standard box sizes or enter a custom marked volume - Work fully offline with no account, ads, or subscription Unlock the Rough-In Box Schedule once to: - Name the current project and label each box or room - Collect up to 30 completed box checks on device - See project totals for passing and overfilled boxes - Put every required correction first, including overage, current box, and recommended replacement - Reload any scheduled check into the free calculator - Share or export one complete plain-text schedule - Restore lifetime access on another device Built for electricians, apprentices, and foremen who want to avoid repulls, box swaps, and inspection-day surprises. Important: - Always verify the enclosure's marked volume and local requirements on site. - This app is a practical field aid, not a substitute for code judgment or inspection approval.

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Inspection Cards is now an exception-first Rough-In Box Schedule. Label up to 30 completed checks, see project totals and required corrections first, reload any box, and share or export one complete schedule. Full single-box results remain free.

Version 1.3

The developer, 光 杨, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • 光 杨
    Size
    • 2.4 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Guang Yang
  • Privacy Policy

    • More by 光 杨

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