# NEC Box Fill Calc

> Catch Overfilled Boxes Early

Canonical page: [https://chrome-stats.com/d/id6767993285](https://chrome-stats.com/d/id6767993285)

## Overview

- **ID:** `id6767993285`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 光 杨
- **Category:** Utilities
- **Version:** 1.3
- **Last updated:** 2026-09-02
- **First published:** 2026-05-12
- **Size:** 2.25 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/nec-box-fill-calc/id6767993285)
- **Privacy policy:** [https://apple-privacy-sites.pages.dev/apps/box-fill-calculator/privacy/](https://apple-privacy-sites.pages.dev/apps/box-fill-calculator/privacy/)

## Description

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.

## Rankings

- #1,312,394 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6767993285)