# Resistance Calculator: In Ohms — Resistor bands, Watt & Ohm Law

> Electronics utility for resistor color code decoding and Ohm's/Watt's Law calculations. (iPhone/iPad app by TROTHMATRIX.)

- Source: https://appshunter.io/ios/app/resistance-calculator-in-ohms/id1462608828 (this page in markdown: same URL + `.md`)
- Developer: [TROTHMATRIX](https://appshunter.io/developer/1451285427)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 4.60/5 from 9 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 13 MB
- Languages: American English
- Released: 2019-05-08
- Data updated: 2026-08-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/resistance-calculator-in-ohms/id1462608828/reviews.md

## What is Resistance Calculator?

Resistor Color Code to Ohms (Ω) is a reliable and easy-to-use electronics utility designed to help you quickly calculate resistance using standard Resistor color codes (3-band, 4-band, 5-band, or 6-band). Whether you are an electronics hobbyist, engineering student, or professional engineer, this app simplifies resistor identification and circuit calculations, saving time and reducing errors.

With an intuitive interface, you can select the color bands of 3-band, 4-band, 5-band, or 6-band resistors and instantly view the calculated resistance value in ohms (Ω), along with tolerance and multiplier information. This makes it ideal for identifying resistors during circuit design, repair, prototyping, or learning electronics fundamentals.

In addition to resistor color code decoding, the app includes a built-in Ohm’s Law and Watt’s Law calculator. Easily calculate voltage, current, resistance, and power by entering known values. This all-in-one approach removes the need for multiple tools and helps you perform essential electrical calculations accurately and efficiently.
The app supports both Light and Dark themes, allowing you to choose a comfortable viewing experience in any environment. The clean layout and clear visual design ensure quick understanding and ease of use, even for beginners.

Key Features:
1. Decode resistor color codes into accurate resistance values
2. Supports 3-band, 4-band, 5-band, and 6-band resistors
3. Built-in Ohm’s Law and Watt’s Law calculators
4. Calculate voltage, current, resistance, and power
5. Clean, intuitive interface for fast calculations
6. Light and Dark mode support

Ideal for electronics hobbyists, students, technicians, and engineers
Whether you are studying electronics, working on DIY projects, or designing professional circuits, Resistor Color Code to Ohms (Ω) is a practical and dependable tool you can rely on every day.

Our companies vision is to create apps like this resistor color code calculator. We want to help electrical engineers and electricians in their every day work lives.

If you have any feedback or app improvements ideas, please mail us at trothmatrixapps@gmail.com

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.trothmatrix.com/

## Key features

- Decode resistor color codes
- Supports 3-6 band resistors
- Ohm's Law calculator
- Watt's Law calculator
- Calculate V, I, R, and P
- Light and Dark themes

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly Premium | $0.49 | per 7 days |
| Monthly Premium Subscription | $1.49 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Purchase Premium Version | $12.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/resistance-calculator-in-ohms/id1462608828/reviews.md

### 5/5 — Resistor calculator - easy to use and fast

*2021-08-29*

I am using this for a while now. Does a quick job

## Frequently asked questions about Resistance Calculator

### How do I calculate resistance with Resistance Calculator?

You can select the color bands of 3-band, 4-band, 5-band, or 6-band resistors directly in the app. It will then instantly display the calculated resistance value in ohms, along with tolerance and multiplier information.

### What electrical laws can I calculate with Resistance Calculator?

Resistance Calculator includes built-in calculators for Ohm's Law and Watt's Law. You can easily compute voltage, current, resistance, and power by inputting known values.

### Does Resistance Calculator have ads?

Yes, Resistance Calculator contains advertisements. This allows the app to remain free for users while offering its utility features.

### What are the premium subscription options for Resistance Calculator?

Resistance Calculator offers a Weekly Premium subscription for $0.29/P7D with a 3-day free trial, and a Monthly Premium Subscription for $0.99/P1M with a 7-day free trial.

### Is Resistance Calculator suitable for beginners?

Yes, the app features a clean, intuitive interface and clear visual design, making it easy to understand and use even for beginners learning electronics fundamentals.

### On which devices can I use Resistance Calculator?

Resistance Calculator is available for iPhone, iPad, and iPod. It supports both Light and Dark themes for a comfortable viewing experience on these devices.

### How often is Resistance Calculator updated?

The latest version of Resistance Calculator is 1.8.3, and it was last updated on January 25, 2026. This indicates a relatively active development cycle.

### What is the age rating for Resistance Calculator?

Resistance Calculator has an age rating of 4+. This means it is considered appropriate for children aged 4 and above, with no significant mature content.

## Version history (last 5 releases)

### 1.8.5 — 2026-07-19

- Bug fixes and app improvements

### 1.8.4 — 2026-06-30

- Internal app fixes and improvements

### 1.8.3 — 2026-01-25

- Add Ohm & Watt law
- Updated app performance

### 1.8.1 — 2026-01-06

- Updated app to support iOS 26.2
- Added Ohm's Watt Law Calculator 
- Added

### 1.8 — 2025-02-18

- App improvements and updates to support latest version.

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## More apps by TROTHMATRIX

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All apps by TROTHMATRIX: https://appshunter.io/developer/1451285427

## Related topics

[resistor code calculators](https://appshunter.io/ios/topics/resistor-code-calculators) · [the ohms law calc](https://appshunter.io/ios/topics/the-ohms-law-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 2026-08-24.*