# NEC Box & Conduit Calc — NEC Tools for Electricians

> Electrical box and conduit fill calculator based on the National Electrical Code. (iPhone/iPad app by V PUGAZHENTHI.)

- Source: https://appshunter.io/ios/app/nec-box-and-conduit-calc/id6755513987 (this page in markdown: same URL + `.md`)
- Developer: [V PUGAZHENTHI](https://appshunter.io/developer/491898049)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 4.90/5 from 19 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 40 MB
- Languages: American English, Mexican Spanish
- Released: 2025-12-02
- Data updated: 2026-08-30
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/nec-box-and-conduit-calc/id6755513987/reviews.md

## What is NEC Box & Conduit Calc?

NEC Box & Conduit Calc is the fastest, most accurate way to calculate box fill, conduit fill, required conduit size, and wire volume — all to the NEC (National Electrical Code).

Built for electricians, contractors, engineers, inspectors, and apprentices, it delivers instant, code-compliant results that save time on every job — right from your pocket, even offline.

Key Features

• Box Fill Calculator
– Device counts, equipment grounding, internal clamps
– All common box sizes and types
– NEC-compliant volume with clear breakdowns

• Conduit Fill Calculator
– EMT, PVC, RMC, IMC & more
– Multiple conductor sizes per conduit
– NEC fill percentages with instant pass/fail

• Required Conduit Size
– Enter your conductors, get the correct conduit size instantly
– See the next size up and down

• NEC Reference Tables
– Chapter 9 Tables 1, 4 & 5 at your fingertips
– Browse every NEC box and conduit size

• Accurate Wire Volume Data
– Built-in AWG volume reference for field, shop, and inspection

• Professional PDF Reports
– Export clean, shareable reports for your records or the inspector

• Clean, Simple Interface
– Designed for electricians under time pressure
– Easy to use with gloves
– Works fully offline

Perfect For
• Electricians
• Electrical contractors
• Students & apprentices
• Inspectors
• Engineers & designers

Download now and get code-compliant fill calculations in seconds — on every job.

## Key features

- Box fill calculations
- Conduit fill calculations
- Wire volume data
- Supports multiple conduit types
- Supports device counts and clamps
- Offline functionality
- Clean, simple interface

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| NEC Box Conduit Calc Pro | $4.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/nec-box-and-conduit-calc/id6755513987/reviews.md

### 5/5 — Good

*2025-12-03*

Good start excited to so where he takes it.

**Developer response:** happy to hear 😎

## Frequently asked questions about NEC Box & Conduit Calc

### What is NEC Box & Conduit Calc?

NEC Box & Conduit Calc is a utility app designed to accurately calculate electrical box fill and conduit fill according to the National Electrical Code (NEC). It provides instant results and clear breakdowns to save time for professionals and students in the electrical field.

### Who is NEC Box & Conduit Calc for?

This app is perfect for electricians, electrical contractors, inspectors, engineers, designers, students, and apprentices who need to perform NEC-compliant fill calculations.

### Does NEC Box & Conduit Calc work offline?

Yes, NEC Box & Conduit Calc is designed to work offline, making it a reliable tool for use in the field where internet connectivity may be limited.

### What types of boxes and conduits does NEC Box & Conduit Calc support?

The app supports all common box sizes and types, and for conduits, it supports EMT, PVC, RMC, IMC, and more. It also allows for the selection of multiple conductor sizes per conduit.

### How accurate are the calculations in NEC Box & Conduit Calc?

The app is built for accuracy according to the NEC, providing NEC-compliant volume calculations for boxes and NEC-based fill percentages for conduits. It includes a built-in AWG wire volume reference.

### Does NEC Box & Conduit Calc have ads?

Yes, the free version of NEC Box & Conduit Calc contains subtle advertisements. Users can upgrade to the Pro version to remove ads and unlock future features.

### What are the pricing details for NEC Box & Conduit Calc?

The app is free to download and use, supported by ads. There is an option to upgrade to a Pro version to remove ads and access additional features.

### On what devices can I use NEC Box & Conduit Calc?

NEC Box & Conduit Calc is available for iPhone and iPad devices, making it accessible for a wide range of Apple users in the electrical trade.

## Version history (last 5 releases)

### 1.9 — 2026-08-28

Obras (Proyectos): guarda los cálculos en la obra a la que pertenecen y exporta la obra completa en un solo PDF.
Se corrigió el tamaño de tubería requerido conforme a la Tabla 1 del Capítulo 9 del NEC: 53 % para un conductor, 31 % para dos y 40 % para tres o más.
Se eliminaron todos los anuncios.

### 1.8 — 2026-07-19

• Cleaner layout and faster experience across calculators and reference tables
• Bug fixes and performance improvements

### 1.7 — 2026-06-11

Cleaner calculator screens, and a refreshed upgrade flow.

### 1.6 — 2026-05-02

Performance improvements, and better user experience — update now.

### 1.5 — 2026-02-27

New: Optional extension ring support in box fill, with NEC‑correct math and PDF reports.

## Apps similar to NEC Box & Conduit Calc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Box Fill 2](https://appshunter.io/ios/app/box-fill-2/id1589765411) | 3.0 (2) | $3.99 | Utilities |
| [AWG Calculator: Wire Size](https://appshunter.io/ios/app/awg-calculator-wire-size/id1607173204) | 4.6 (67) | Free | Utilities |
| [FILL ◦ Conduit Fill Calculator](https://appshunter.io/ios/app/fill-conduit-fill-calculator/id6760678246) | 4.0 (3) | Free | Utilities |
| [National Electricians Calc](https://appshunter.io/ios/app/national-electricians-calc/id6760480960) | 5.0 (1) | Free | Utilities |
| [ConduitLab: NEC Calculator](https://appshunter.io/ios/app/conduitlab-nec-calculator/id6757708241) | 5.0 (3) | Free | Utilities |
| [Conduit Fill Pro](https://appshunter.io/ios/app/conduit-fill-pro/id6761177494) | 3.7 (3) | Free | Utilities |

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All apps by V PUGAZHENTHI: https://appshunter.io/developer/491898049

## Related topics

[electrical box fill calculator](https://appshunter.io/ios/topics/electrical-box-fill-calculator) · [electrical conduit fill](https://appshunter.io/ios/topics/electrical-conduit-fill) · [building wire reliability calc](https://appshunter.io/ios/topics/building-wire-reliability-calc)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*