# Ground Rod Resistance Calc — NEC 25-Ohm Compliance Tool

> NEC 25-Ohm Compliance Tool (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/ground-rod-resistance-calc/id6761745654 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-04-08
- Data updated: 2026-07-08
- User reviews in markdown: https://appshunter.io/ios/app/ground-rod-resistance-calc/id6761745654/reviews.md

## What is Ground Rod Resistance Calc?

Installing ground rods and need to verify NEC 25-ohm compliance before the inspector arrives? Enter rod length, diameter, soil resistivity, and number of rods. Get single rod resistance and total system resistance with correction factors for multi-rod arrays. Green pass or red fail indicator shows compliance at a glance.

WHAT IT CALCULATES:
- Single rod resistance using standard IEEE/NEC formula
- Total system resistance for multi-rod arrays (up to 10 rods)
- Correction factors for rod spacing and count
- NEC 25-ohm pass/fail compliance indicator

INPUTS:
- Rod length (ft)
- Rod diameter (in)
- Soil resistivity (ohm-meters)
- Number of rods
- Rod spacing

KEY FEATURES:
- Color-coded NEC compliance indicator (green pass / red fail)
- Multi-rod array support with correction factors
- Instant results as you adjust inputs
- Works completely offline
- No account or login required

Built for electricians, inspectors, and electrical contractors who need quick ground resistance verification on the job site.


## Version history (last 3 releases)

### 1.0.3 — 2026-06-27

Added a More Pro Tools section to discover related field calculators.

### 1.0.2 — 2026-04-12

Bug fixes and performance improvements.

### 1.0.1 — 2026-04-08

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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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 2026-07-08.*