# Conduit Fill Calculator-NEC — NEC Chapter 9 Pipe Fill

> NEC Chapter 9 Pipe Fill (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Reference
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 34 MB
- Languages: English
- Released: 2026-04-23
- Data updated: 2026-08-19
- User reviews in markdown: https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849/reviews.md

## What is Conduit Fill Calculator?

NEC conduit fill calculator for electricians, apprentices, and electrical engineers. Calculate conduit fill percentages instantly using official NEC Chapter 9 data - Tables 1, 4, and 5. This electrical raceway calculator supports all conduit types and wire sizes. Works 100% offline on the job site.

Whether you're pulling THHN through EMT, running FMC to a motor, or sizing PVC for a big commercial run, this conduit fill calculator gives you accurate NEC-compliant results in seconds. Use it as your portable conduit fill chart and raceway fill reference, faster than looking up wire count tables manually - perfect for residential and commercial installations.

CONDUIT FILL CALCULATOR FEATURES:
- 13 conduit types: EMT, ENT, FMC, IMC, LFNC-A, LFNC-B, LFMC, RMC, PVC Schedule 40, PVC Schedule 80, PVC Type A, PVC Type EB, HDPE
- Trade sizes from 3/8" through 6"
- 15 wire insulation types: building wire (THHN/THWN-2, XHHW-2, THW, RHH/RHW-2, USE-2, TW), fixture wire (TFFN/TFN, PF, PGF, PAF, PTF, ZF, SF-1, SF-2, RFH-2, FFH-2, KF-1) and high-temperature FEP, FEPB, PFA, PFAH, TFE
- Wire sizes: 18 AWG to 1000 MCM (16/18 AWG for fixture wire)
- AWG and mm² (metric) wire display
- NEC Table 1 fill rules: 53% (1 wire), 31% (2 wires), 40% (3+ wires)
- Visual PASS/FAIL indicator with fill percentage
- Shows how many more wires you can add
- Auto-suggests the smallest conduit size that fits your wires - even when the current size already passes
- Nipple mode: conduit nipples up to 24 in use the NEC 60% fill allowance (Chapter 9, Note 4)
- Mix different wire sizes in the same conduit fill calculation

PRO FEATURES (one-time purchase):
- No ads - clean interface for professionals
- Save conduit fill calculation history
- Export calculations as PDF reports for permits and records
- Dark theme support

BUILT FOR ELECTRICIANS ON THE JOB SITE:
This conduit fill calculator is designed by electricians, for electricians. The interface is clean, fast, and works with one hand. Add wires, see your fill percentage, and move on - no complicated menus or unnecessary features.

ACCURATE NEC CONDUIT FILL DATA:
All conduit and wire areas are sourced from the NEC Chapter 9. Conduit fill percentages follow NEC Table 1 rules exactly:
- 1 wire: 53% maximum fill
- 2 wires: 31% maximum fill
- 3 or more wires: 40% maximum fill

NEC TABLES INCLUDED:
- NEC Chapter 9, Table 1 - Percent fill for conduit and tubing
- NEC Chapter 9, Table 4 - Conduit dimensions and areas (EMT, ENT, FMC, IMC, LFNC, LFMC, RMC, PVC, HDPE)
- NEC Chapter 9, Table 5 - Wire dimensions and areas (THHN, XHHW, THW, RHW, USE, TW, TFFN, PF, ZF, SF, RFH, KF, FEP, PFA, TFE)

PERFECT FOR:
- Licensed electricians doing conduit fill calculations daily
- Electrical apprentices studying for journeyman exams
- Electrical engineers and designers
- Electrical contractors bidding commercial and residential jobs
- NEC code exam preparation
- Anyone who needs a fast, accurate conduit fill calculator
- Conduit sizing and wire count on the job site

OFFLINE & PRIVACY:
- Works 100% offline - no internet needed on the job site
- No account required
- No data collection - your calculations stay on your device

Simplify your conduit fill calculations on the job site.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 4 releases)

### 1.2.0 — 2026-06-13

What's new:
• 15 wire insulation types — added TFFN and the full fixture-wire family (PF, PGF, PAF, PTF, ZF, SF-1, SF-2, RFH-2, FFH-2, KF-1) plus high-temperature FEP, FEPB, PFA, PFAH, TFE
• Added 16 AWG and 18 AWG sizes for fixture wire
• Nipple mode: nipples up to 24 in fill to 60% (NEC Chapter 9, Note 4)
• Auto-suggests the smallest conduit that fits — even when the current size passes
• Bug fixes and stability improvements

Send feedback to support@tradetools.dev.

### 1.1.8 — 2026-06-10

What's new:
• Full NEC Chapter 9 Table 4 coverage — 13 conduit types, including FMC, ENT, LFMC, LFNC-A/B, PVC Type A, PVC Type EB and HDPE
• More wire insulation types: XHHW-2, THW, RHH/RHW-2, USE-2 and TW
• Trade sizes now range from 3/8" to 6"
• The size list adapts to the conduit and wire type you select

Thanks to everyone who asked for more conduit types — keep the feedback coming at support@tradetools.dev.

### 1.1.7 — 2026-04-29

What's new:
• Moved to tradetools.dev — new umbrella site for all our trade calculators
• Updated support email: support@tradetools.dev
• Refreshed privacy & support pages with unified design
• Bug fixes and stability improvements

Thanks for using ElecTools! Send feedback to support@tradetools.dev.

### 1.1.4 — 2026-04-23

No release notes.

## Apps similar to Conduit Fill Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [AUBICAR](https://appshunter.io/ios/app/aubicar/id6745027431) | — | Free | Utilities |
| [Conduit Fill Pro](https://appshunter.io/ios/app/conduit-fill-pro/id6761177494) | — | Free | Utilities |
| [Electrical Calculator Pro](https://appshunter.io/ios/app/electrical-calculator-pro/id6759329271) | — | Free | Utilities |
| [ElectriCalc: NEC Calculator](https://appshunter.io/ios/app/electricalc-nec-calculator/id6760935722) | 4.3 (4) | Free | Utilities |
| [Conduit Fill](https://appshunter.io/ios/app/conduit-fill/id6469908455) | 3.3 (3) | $4.99 | Utilities |
| [Electrical Calc Elite](https://appshunter.io/ios/app/electrical-calc-elite/id510284903) | 4.8 (125) | $19.99 | Utilities |

## More apps by Rizvan Adzhoian

- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

---

*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 2026-08-19.*