---
title: "NEC Box Fill Calc - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "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"
---

# NEC Box Fill Calc — United States
> Catch Overfilled Boxes Early

![NEC Box Fill Calc App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/15/68/d6/1568d633-2832-f1c4-ee83-f8be99f3eb74/AppIcon-1x_U007emarketing-0-8-0-85-220-0.png/434x0w.png)

**Developer:** [光 杨](https://apptail.io/developer/developer-NExgVb)
**Category:** Utilities
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** com.yangguang.boxfillcalculator
**Store:** Apple App Store
**Country:** United States
**Version:** 1.3 (released 2026-09-02)
**Original Release:** 2026-05-12
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6767993285)
**AppTail Page:** [https://apptail.io/app/nec-box-fill-calc-wsMA/united-states](https://apptail.io/app/nec-box-fill-calc-wsMA/united-states)

## NEC Box Fill Calc Description
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.

## NEC Box Fill Calc Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2b/77/86/2b77864f-e063-d1ec-e658-f7725b35e14c/01.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c7/b9/14/c7b91485-b0ec-b6b5-758c-cb96d9836f9e/02.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/99/ab/83/99ab83a8-3d6f-4497-e32b-b29594bfa47c/03.png/1284x2778.png)



## NEC Box Fill Calc In-App Purchases
| Item | Price |
|------|-------|
| Inspection Cards Lifetime Unlock | $7.99 |



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## NEC Box Fill Calc Available In
- [China](https://apptail.io/app/nec-box-fill-calc-wsMA/china)
- [Saudi Arabia](https://apptail.io/app/nec-box-fill-calc-wsMA/saudi-arabia)
- [United States](https://apptail.io/app/nec-box-fill-calc-wsMA/united-states)

---

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