# Ohmulator — Ohm's Law Calculator

> Electric circuit calculator for Ohm's Law and resistance. (iPhone/iPad app by Armchair Engineering.)

- Source: https://appshunter.io/ios/app/ohmulator/id398901336 (this page in markdown: same URL + `.md`)
- Developer: [Armchair Engineering](https://appshunter.io/developer/398901339)
- Category: Utilities, Productivity
- Price: $0.99
- Rating: 4.70/5 from 79 App Store ratings · 34 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 5 MB
- Languages: American English
- Released: 2010-10-26
- Data updated: 2026-08-16
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ohmulator/id398901336/reviews.md

## What is Ohmulator?

Makes Ohm's Law simple!

Ohmulator is a simple, yet robust, electric circuit calculator that enables you to quickly find the unknown variables of a circuit.

Ohmulator allows you to easily adjust unit types on the fly (eg. milli Amps, Amps, kilo Amps), which means no prior conversion!

Enter two known variables (from: I = Current, R = Resistance, V = Voltage, P = Power), set preferred units, then Ohmulator will calculate and return the previously unknown values. 

Also an effective (total) resistance calculator.


What two App Store reviewers had to say about Ohmulator:

"Great. Does what it says. Very good app. Stylish design."  5 Stars -  Jamie1990jamie 

"Awesome app. It simply works. A must have for the radioamateur or electronic nerd. Nice to have the watt law as well." 5 Stars - Per67


Also available for macOS on the Mac App Store.

## Key features

- Ohm's Law calculations
- Calculate unknown variables
- Adjustable unit types
- Total resistance calculator
- Supports Voltage, Current, Resistance, Power

## Recent user reviews (10 of 34)

All indexed reviews: https://appshunter.io/ios/app/ohmulator/id398901336/reviews.md

### 5/5 — Au top

*2023-08-25*

Simple, efficace, compréhensible et formateur

### 5/5 — The Best

*2018-01-15*

Great app while in school for HVAC

### 5/5 — Great App

*2017-09-06*

Use it so much in solar / wind generator set up

### 4/5 — Works excellent

*2017-08-24*

Could use way more algorithms though.

### 5/5 — Works great, easy to use.

*2015-01-19*

Ohmulator does everything I need it to. I mostly use it for calculating power and current on my coil builds. Helps me ensure my mod doesn't turn into a pipe bomb!

### 2/5 — Hate the update

*2014-04-16*

Was a five star app, new update painful to look at and less functional. 
Will look for a replacement.
Would pay for a legacy version liked to old one so much.

### 5/5 — Great update!

*2013-11-16*

Thank you for the update. Very nice.

### 5/5 — Love the new design!

*2013-11-15*

Looks really good.

### 4/5 — Good app

*2013-03-11*

Handy bit of kit.good time saver

### 4/5 — A1

*2012-08-30*

Pratique!

## Frequently asked questions about Ohmulator

### What does Ohmulator do?

Ohmulator is an electric circuit calculator designed to simplify Ohm's Law calculations. It allows you to input any two known variables from Voltage, Current, Resistance, or Power, and it will automatically calculate the remaining unknown values.

### What are the key features of Ohmulator?

Key features include the ability to calculate unknown variables in an electric circuit using Ohm's Law, on-the-fly unit adjustments for variables like milliamps or kilovolts, and an effective total resistance calculator. It supports all four main variables: Voltage, Current, Resistance, and Power.

### Is Ohmulator free to use?

Yes, Ohmulator is a free application. The provided data indicates no in-app purchases or advertisements, suggesting a completely free user experience.

### What devices is Ohmulator compatible with?

The application is available for mobile devices. It is also mentioned as being available for macOS on the Mac App Store, indicating compatibility with both mobile and desktop Apple operating systems.

### Who would find Ohmulator useful?

Ohmulator is useful for anyone working with electric circuits, including electricians, radio amateurs, electronics enthusiasts, and students. It's particularly helpful for quickly finding unknown values without manual conversion of units.

## Version history (last 5 releases)

### 2.2.1 — 2019-12-07

- Fixed floating keyboard bug, present on some devices running iOS 13

### 2.2 — 2018-02-06

- iPhone X support
- Added number pad appearance settings
- Bug fixes

### 2.1 — 2015-01-18

- Improved support for iOS 8 & newer iPhones
- Bug fixes
- Now requires iOS 6 or above

If you like Ohmulator, please rate it on the App Store.

### 2.0.2 — 2014-11-18

- Improved iOS 8 compatibility
- Minor bug fixes

### 2.0.1 — 2013-12-12

- Bug fixes
- Minor visual tweaks

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## More apps by Armchair Engineering

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- [Temperature Converter Classic](https://appshunter.io/ios/app/temperature-converter-classic/id417716278)
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All apps by Armchair Engineering: https://appshunter.io/developer/398901339

## Related topics

[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 2026-08-16.*