# Electrical Calculator: NEC — Voltage drop, wire size, NEC

> Voltage drop, wire size, NEC (iPhone/iPad app by Fedor Tryakin.)

- Source: https://appshunter.io/ios/app/electrical-calculator-nec/id6781034650 (this page in markdown: same URL + `.md`)
- Developer: [Fedor Tryakin](https://appshunter.io/developer/6780532362)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 28 MB
- Languages: American English
- Released: 2026-06-30
- Data updated: 2026-07-03
- User reviews in markdown: https://appshunter.io/ios/app/electrical-calculator-nec/id6781034650/reviews.md

## What is Electrical Calculator?

Electrical Calculator is a fast, offline toolkit for electricians, students and DIY pros - with no subscription and no ads.

The core calculators are free forever. Unlock Pro once (no subscription, ever) for the full professional set.

FREE
- Ohm's Law: enter any two of volts, amps, ohms, watts
- Energy cost: power, hours and rate to kWh and cost
- Series and parallel resistance

PRO (one-time)
- Voltage drop: wire, load and length to drop, percent and end voltage
- Wire size: smallest AWG for load and voltage drop
- Ampacity: AWG to amps (NEC 310.16, 75C) with breaker limits
- Conduit fill: EMT and THHN to percent fill
- Box fill: conductors and devices to required volume (NEC 314.16)
- Motor FLA: HP and voltage to full-load amps, conductor and breaker
- Three-phase power and current, transformer kVA
- Power factor correction, conduit bending, wire resistance, amps to kW/HP

MORE
- Works fully offline, no account, no tracking
- Light and dark themes, English and Russian
- Paperless tape: save and share your results

Estimates are based on the NEC. Always verify against your local code and the authority having jurisdiction. This app is a tool, not a substitute for a licensed electrician.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Electrical Pro | $9.99 | one-time |
| Coffee | $0.99 | one-time |
| Cake | $2.99 | one-time |
| Tip: 1.99 | $1.99 | one-time |
| Party | $4.99 | one-time |
| Tip: 7.99 | $7.99 | one-time |
| Tip: 9.99 | $9.99 | one-time |
| Tip: 19.99 | $19.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-06-30

No release notes.

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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 2026-07-03.*