# Wire Size Calc — NEC Ampacity & Derating

> NEC Ampacity & Derating (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/wire-size-calc/id6763313160 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 34 MB
- Languages: American English
- Released: 2026-04-24
- Data updated: 2026-08-07
- User reviews in markdown: https://appshunter.io/ios/app/wire-size-calc/id6763313160/reviews.md

## What is Wire Size Calc?

NEC wire size calculator for electricians, apprentices, and electrical engineers.

Determine the correct wire gauge (AWG/kcmil) for any circuit using official NEC 2023 ampacity tables and derating factors. Supports continuous and non-continuous loads, copper and aluminum conductors, 6 insulation types, and both conduit and free air installations. No internet required - works 100% offline on the job site.

FEATURES:
- Continuous and non-continuous load sizing (125% factor)
- 5 voltage presets: 120V, 208V, 240V, 277V, 480V
- Single-phase and three-phase support
- Copper and aluminum conductors: 14 AWG through 2000 kcmil
- AWG and mm² (metric) display toggle
- 6 insulation types: THHN, THW, TW, XHHW-2, NM-B, USE-2
- Conduit and free air installation methods
- Temperature correction factor (NEC 310.15(B)(1))
- Conduit fill adjustment factor (NEC 310.15(C)(1))
- Termination rating check (60°C / 75°C per NEC 110.14(C))
- Overcurrent protection sizing (NEC 240.4(D))
- Optional voltage drop check when distance is provided
- PASS/FAIL indicator for quick compliance check

NEC REFERENCES:
- Table 310.16 - Ampacity in conduit/raceway
- Table 310.17 - Ampacity in free air
- Table 310.15(B)(1) - Temperature correction factors
- Table 310.15(C)(1) - Conduit fill adjustment factors
- NEC 110.14(C) - Termination temperature limits
- NEC 240.4(D) - Small conductor overcurrent protection

PRO FEATURES (one-time purchase):
- No ads
- Save calculation history
- Export calculations as PDF reports
- Dark theme support

BUILT FOR THE JOB SITE:
This app is designed by electricians, for electricians. Enter your circuit parameters, get the recommended wire size instantly - no complicated menus or unnecessary features. One-hand operation, instant results.

HOW IT WORKS:
1. Enter load current in amps
2. Select load type (continuous or non-continuous)
3. Choose voltage, phase, conductor material, insulation type
4. Set installation method and ambient temperature
5. Get recommended wire size with full derating breakdown

The calculator automatically applies:
- 125% continuous load factor
- Temperature correction for ambient conditions
- Conduit fill adjustment for conductor count
- Termination temperature limit verification
- Standard breaker size selection

PERFECT FOR:
- Licensed electricians
- Electrical apprentices
- Electrical engineers and designers
- Electrical contractors
- NEC code exam preparation
- Journeyman and master electrician exams

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

Simplify your wire sizing 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 |


## Chart rankings

- #190 in Top Paid · Utilities (US App Store)


## Version history (last 5 releases)

### 1.1.0 — 2026-06-11

What's new:
• AWG / mm² unit toggle in Settings — show wire sizes with their metric cross-section (e.g. 12 AWG · 3.31 mm²)
• Metric labels apply everywhere: result card, history and PDF export
• NEC sizing math is unchanged — mm² is the exact area of the AWG conductor
• Bug fixes and stability improvements

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

### 1.0.9 — 2026-06-10

What's new:
• Full NEC size range: added 700, 800, 900, 1250, 1500, 1750 and 2000 kcmil to Tables 310.16 and 310.17
• Ampacity values aligned with the current NEC tables
• Aluminum small-conductor breaker limits per NEC 240.4(D): 12 AWG max 15A, 10 AWG max 25A
• Bug fixes and stability improvements

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

### 1.0.8 — 2026-05-18

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.

### 1.0.7 — 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.

### 1.0.6 — 2026-04-26

Privacy & ad consent update:

- Updated ad consent flow to comply with Google AdMob's latest privacy requirements
- Added "Manage Ad Privacy" option in Settings so users in the EU and UK can review or change their consent at any time
- Improved ad initialization stability and App Tracking Transparency handling
- Minor performance and reliability fixes

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [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

## Related topics

[wire size calc](https://appshunter.io/ios/topics/wire-size-calc) · [wire size calculator for electricians](https://appshunter.io/ios/topics/wire-size-calculator-for-electricians) · [wire size calculator](https://appshunter.io/ios/topics/wire-size-calculator)

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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 2026-08-07.*