# Ohm's Law

> Electrical calculator for Ohm's Law, voltage, current, and resistance. (iPhone/iPad app by Creature Code Mobile, LLC.)

- Source: https://appshunter.io/ios/app/ohms-law/id389305829 (this page in markdown: same URL + `.md`)
- Developer: [Creature Code Mobile, LLC](https://appshunter.io/developer/386736750)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 4.70/5 from 165 App Store ratings · 109 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 9 MB
- Languages: American English
- Released: 2010-08-31
- Data updated: 2026-07-04
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/ohms-law/id389305829/reviews.md

## What is Ohm's Law?

Ohm's Law Calculator

## Key features

- Ohm's Law calculations
- Voltage calculation
- Current calculation
- Resistance calculation
- Electrical formula solver

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## What do users think of Ohm's Law?

Overall sentiment: positive

**Pros**

- 👍 Extremely user-friendly and intuitive interface
- ⚡ Fast and accurate calculations
- 🎯 Simple, focused design with no unnecessary clutter
- 💰 Free app with minimal ads that don't interfere
- 🔧 Requires only two values to calculate the rest
- 📱 Lightweight and always accessible
- 🙌 No in-app purchases or subscriptions required
- ✅ Reliable and consistent performance for most users
- 🎓 Helpful for learning and verification of calculations
- 🔌 Practical for multiple professional fields (electrical, vaping, HVAC, etc.)

**Cons**

- 🐛 Crashes when entering decimal values in multiple fields
- 🐛 Reset function doesn't work properly after first use
- ⚠️ App incompatible with newer iOS versions
- ⚠️ Outdated and hasn't been updated since iOS 6
- ❌ Limited functionality - single resistor only
- 🔋 Suspicious cell data usage reported by some users
- 😞 Ads introduced in recent updates (controversial change)

**Commonly reported bugs**

- App crashes when entering decimal points in multiple fields simultaneously
- Reset button fails to clear values after first use
- Large calculations cause app to crash
- Crashes on iPhone SE and iPhone 7 Plus with iOS 10+
- App won't open or frequently crashes on some devices
- Crashes when entering ohms values
- Decimal point entry causes immediate crash on certain devices
- App unstable and incompatible with iOS 10 and later versions

**Most requested features**

- AC/DC checkbox option
- Three-phase power calculations
- Parallel and combination circuit support
- Impedance and reactance calculations
- Ohm's Wheel reference tool
- Useful electrical tables
- Example calculations showing work/formula
- Number pad input instead of full keyboard
- iOS compatibility updates for newer versions

## Recent user reviews (10 of 109)

All indexed reviews: https://appshunter.io/ios/app/ohms-law/id389305829/reviews.md

### 5/5 — Easy to use

*2025-12-19, version 2.3*

App is user friendly and provides accurate numbers for calculating my math

### 5/5 — Just Perfect

*2025-04-18, version 2.3*

I love this App and use it all the time. It excels due to its simplicity. Enter the values you know and bang - the rest fill-in. No in-app purchases is just a massive bonus. I would pay for this app.

### 5/5 — Awesome App

*2024-08-20, version 2.3*

I have been using it for many years

### 5/5 — Used a few times

*2024-07-13, version 2.3*

Great app as I can’t always remember these formulas so it’s been great to use.

### 5/5 — Good app

*2023-07-01, version 2.3*

Excellent apps , easy to use and very handy, happy user…..

### 4/5 — Missing a value

*2022-08-18, version 2.3*

Please create a check box for AC or DC. That will make this app complete

### 5/5 — Excellent app.

*2022-03-04, version 2.3*

Magic app. Always at your finger tips. So easy to carry out ‘what if’s’.

### 5/5 — Amazing app!!!

*2022-01-20, version 2.3*

I’m a renewable energy field service technician and I probably use this app once a day, it’s legit!

### 5/5 — Very simple works perfectly

*2021-08-14, version 2.3*

No hard to use interfaces, don’t have to select the formula to use like other apps, just punch in the numbers you know, and it spits out what you need. Fast easy and simple.

### 5/5 — I can do it in my head, but the guys can’t

*2021-03-30, version 2.3*

I am an engineer responsible for maintaining 400-buildings, on teeth-three compounds. I can do Ohm’s law in my head close enough for checking 120 &240-Volt circuits.  But the guys who work for me can’t.
So, I have them load this calculator.  It is simple to use and fool proof.

## Frequently asked questions about Ohm's Law

### What does this app do?

This app is a utility tool designed to calculate electrical values based on Ohm's Law. It allows users to easily determine voltage, current, or resistance when two of these values are known.

### What are the key features of this Ohm's Law calculator?

The primary features include the ability to calculate voltage, current, and resistance using Ohm's Law formulas. It serves as a quick reference and calculation tool for electrical parameters.

### Is this app free to use?

The app is free to download and use, offering its core functionality without charge. There are in-app purchases available, which may unlock additional features or remove limitations.

### Who would benefit from using this app?

This app is beneficial for students learning about electricity, electricians working in the field, electronics hobbyists, and engineers who need to perform quick electrical calculations.

## Version history (last 5 releases)

### 2.3 — 2020-12-02

Fix for dark appearance

### 2.2 — 2020-06-29

Layout and bug fixes

### 2.1 — 2017-06-15

Fixed issue with a comma as the decimal mark

### 2.0 — 2017-06-08

Added unit selector
Added restore purchases button

### 1.1 — 2013-02-19

Update for iOS 6

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## More apps by Creature Code Mobile, LLC

- [Trig Solver](https://appshunter.io/ios/app/trig-solver/id398450227)

All apps by Creature Code Mobile, LLC: https://appshunter.io/developer/386736750

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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 2026-07-04.*